• Stemcelex – A Revolutionary Stem Cell Hair Loss Treatment?

    Stemcelex – A Revolutionary Stem Cell

    Stemcelex is the newest product in a long line of hair restoration therapies claiming to “cure” hair loss via stem cell therapy. Given the recent onslaught of news regarding stem cell based hair loss treatments, injectable baldness cures, and research breakthroughs, it’s not surprising to see new therapies claiming to aggressively fight hair loss through these same mechanisms. However, is Stemcelex truly a stem cell based, regenerative hair loss cure, or is it another therapy simply riding the recent wave of interest in these types of non-invasive, revolutionary treatments?

    At first glance, Stemcelex seems quite impressive. The product website is filled with scientific explanations, graphs, charts, and diagrams explaining the science behind stem cell based hair restoration. Stemcelex even states its affiliation with Dr. George Cotsarelis, a researcher at the University of Pennsylvania Medical Center who, along with a talented research team, recently discovered that the bald scalp does not suffer from a lack of stem cells, but rather a dysfunction in the pathway to properly activating stem cells to produce hair. The finding was significant and Dr. Cotsarelis’ involvement and the seemingly detailed science look promising, but what about Stemcelex itself? Does it utilize these scientific breakthroughs and offer an effective treatment for hair loss?

    Unfortunately, despite the impressive name recognition and detailed explanations, Stemcelex doesn’t appear to live up to its lofty hair restoration claims. Despite claiming to “activate” the dormant stem cells described by Dr. Cotsarelis, Stemcelex does not offer any sort of feasible molecular/stem cell based therapy. The website cleverly explains the science behind stem cell inactivation and the promise of reversing the dysfunctional pathway, but instead of reinforcing Dr. Cotsarelis’ view that cures for reversing the inactivation pathway are not yet understood, Stemcelex claims to actually fix the stem cell inactivation through a series of unproven homeopathic and herbal treatments for hair loss.

    So, what is actually inStemcelex? The treatment involves a three day cycle of different lotions and topical treatments for baldness applied twice a day.

    Day1: On the first day of the hair restoration cycle, a topical lotion made from Jaborandi Pilocarpus is applied twice after washing and thoroughly drying one’s hair. According to Stemcelex, Jaborandi Pilocarpus is a parasympathetic activator (it excites the nerves that cause the body to “rest and digest” during periods of relaxation) that rids the scalp of excess oils and dandruff that impede healthy follicular hair growth. Furthermore, Stemcelex claims that Pilocarpus naturally darkens and thickens existing, native hairs. According to the experts, Pilocarpus has no reproducible pharmacological applications and any evidence that it actually thickens and darkens hair is anecdotal.

    Day 2: The second day of the cycle involves Veratrum Lobelianum, a family of herbs commonly used in Chinese medicine.  Stemcelex claims these herbs can penetrate the scalp and activate the necessary molecular signaling to “regenerate” the hair follicle stem cells. Furthermore, Veratrum allegedly down-regulates or prevents the production of Dihydrotestosterone (DHT), the hormone directly responsible for male pattern baldness. According to the research, members of the Veratrum family have been used in everything from a Native American poison to a drug researched in human blood pressure.  Currently, they are used in cancer treatments. Although the science behind cancer therapies indicates that the drug could have some molecular benefit in signaling cell activation and inactivation, there has been no research or evidence suggesting that Veratrum is useful in fighting, reversing, or preventing the effects of male or female hair loss.

    Day 3: During the third day of the Stemcelex cycle, a kelp based topical extract is applied twice daily to provide nutrients to the “new hair growth” and also ensure that the scalp remains clean and healthy. This step of the treatment doesn’t claim to be more than a simple dose of nutrients useful in good scalp hygiene.

    After reviewing the active ingredients behind Stemcelex, there is no evidence to suggest that Stemcelex is an effective hair loss treatment at this point in time. The idea of activating the dormant stem cells is important to finding a molecular cure to hair loss, but despite understanding this importance, Stemcelex doesn’t offer any concrete stem cell reactivation agents. It’s possible that Veratrum may prove useful in cell signaling and reactivating dormant cells, but the current research and evidence simply don’t support its use at this time.  Furthermore, Stemcelex charges a hefty $99.85 for a month supply of the treatment which may keep even the most curious and enthusiastic hair loss suffering men and women away.

    Altogether, the idea of reversing dormant hair follicle stem cells is important, but therapies for effectively stopping and rewiring this pathway do not seem to exist at this point in time. Unfortunately, this seems to nullify the claims made by Stemcelex and prevent it from becoming a stem cell hair loss cure.

  • Dr. Matt Egan

    Dr. Matt Egan
    Dr. Egan
    Dr. Matt Egan is a distinguished hair restoration surgeon based in the UK. Dr. Matt Egan's combination of surgical expertise, dedication to natural aesthetics, and personalized patient care make him a highly regarded choice for individuals seeking hair transplant procedures.
  • Female Hair Loss - Treatment and Restoration

    Female hair loss

    Female hair loss, otherwise known as Female Pattern Baldness (FPB), affects 1 out of every 4 women in the United States. Recent findings have found that the incidence of FPB has been reported to be as low as 8% and as high as 87%. And, it does appear to be as common for women as for men. Most often, menopause is the most frequent time for hair loss in women to become apparent.

    For a woman to lose her hair can be even more troubling than for men. A woman with thinning hair is not generally accepted as part of the normal aging process. Society has come to expect a thick, luxurious head of hair as part of the attractiveness in women.

    While males and females can both experience thinning hair, they typically do not lose their hair in the same order or appearance.

    Women with thinning hair compared to Men

    Typically men observe their hair loss earlier, whereas women will first notice it in their late 20's through their early 40's. Female Pattern Baldness (FPB) is often seen during hormonal changes. These include the use of birth control pills, following childbirth, or during or after the time of menopause.

    Top view of patient
    Top view of patient, showing excellent growth of transplanted hair.

    In addition, men typically have localized areas (patterns) of thinning, whilein women this usually occurs as thinning across the top, or over an even wider area. When women have very diffuse thinning over much of their scalp they are generally not good candidates for hair restoration surgery. However, women with localized hair loss, similar to the typical male pattern baldness, can successfully undergo hair restoration surgery.

    Thinning hair in females is also characterized by an increase in the combination of normal thick hairs mixed in with finer, smaller hairs. This results in decreased density, and not total hair loss.

    A woman's hair has also been proven to be more sensitive to the effects of stress than men's hair. Stress can result in hair loss in women and men. But this type of loss is not female pattern baldness. Rather, it is known as “telogen effluvium.” This type of hair loss is the shedding of hair in the resting phase when the body senses that it needs to divert its energies elsewhere. Therefore stress can temporarily changes the amount of hair that is shed. But the lost hair is likely to grow back.

    The production of the hair loss-inducing androgens is also different among men and women. A woman produces a small quantity of androgens in the adrenal glands and the ovaries. The ovaries also produce pre-hormones, which are then converted to androgens on the outside of the ovaries or adrenal glands.

    Generally speaking, a woman with hair loss will probably not experience total balding in a given area. But if there is total hair loss, this is most likely a sign of a previously hidden disease. For this reason, it’s important for females to have their hormone levels checked by a physician if they are experiencing heavy hair loss.

    Finally, men and women react differently to various hair loss treatment options. In men, hair loss may be halted or even reversed by finasteride (brand named "Propecia"). However, Propecia is not safe for females or children. Minoxidil (Rogaine) can be effective for both men and women in treating hair loss.

    However, for some women the causes of their hair loss are much more complex than the classic "male pattern baldness". Thus proper diagnosis of the underlying cause is vital before any hair loss treatments are attempted.

    The following physicians are nationally well known experts in female hair loss. Feel free to contact them.

    David Whiting in Dallas, Texas - 214 824-2087

    Vera Price in San Francisco, California 415 353-4163

    Maria Hordinsky in Minneapolis, Minnesota 612 625-1493

    Wilma Bergfeld in Cleveland, Ohio 216 444-5722

    For a web community that is dedicated to female hair loss visit HerAlopecia.com

  • Follicular Unit Hair Transplantation - Step by Step

    Follicular Unit Hair Transplantation - Step by Step

    We believe that patients have a right to full disclosure and a complete understanding of exactly what hair restoration surgery involves.

    This step by step presentation shows how today’s state of the art follicular unit hair transplant procedure is typically performed.

    Step 1 - hair transplant donor area

    Patient is prepared for surgery

    During surgery hair follicles from the back of the head that are genetically resistant to going bald will be removed and relocated (transplanted) to the balding areas.

    Step 2 - Patient is prepared for surgery

    Donor area is trimmed

    Prior to surgery, the hair in donor area that will be surgically removed is trimmed.

    Donor area is prepared for surgery

    Once the donor area has been prepared it is given local anesthesia.

    Donor tissue is removed

    Donor tissue is removed

    The donor tissue containing the bald resistant hair follicles is then surgically removed.

    Donor area is sutured

    Donor area is sutured

    The donor tissue containing the bald resistant hair follicles is then surgically removed.

    Hair combed over sutures

    Hair combed over sutures

    When patient’s hair is combed over the donor area the sutures are not visible. These sutures are typically removed approximately ten days after surgery.

    Donor tissue is trimmed into follicular unit grafts

    Donor tissue is trimmed into follicular unit grafts

    Surgical technicians then use microscopes to view the donor tissue in order to dissect and prepare follicular units hair grafts.

    Bald recipient area is prepared

    Bald recipient area is prepared

    After being given local anesthesia, the balding recipient area is ready for surgery. No trimming or shaving of hair is needed in the top recipient area.

    Incisions are made in the balding areas

    Incisions are made in the balding areas

    Tiny incisions are made in the recipient areas in irregular patterns that mimic nature. The follicular unit grafts will then be placed carefully into these tiny incisions.

    Grafts are placed into the incisions

    Grafts are placed into the incisions

    Follicular unit grafts are gently placed into the recipient incisions.

    Grafts are placed in varying densities

    Grafts are placed in varying densities

    Typically the smallest one and two hair grafts are placed in the very front of the hairline, with three and four hair grafts placed behind them.

    Patient immediately following surgery

    Patient immediately following surgery

    Following surgery a patient will have hundreds of tiny incisions with short hair stubble showing from the new grafts.

    Close up of recipient area after surgery

    Close up of recipient area after surgery

    The tiny graft incisions heal rapidly. The redness and scabbing in the recipient area normally clears up within about one week.

  • Dr. Taleb Barghouthi

    Dr. Taleb Barghouthi
    Dr. Taleb Barghouthi
    Dr. Barghouthi performs Ultra Refined Follicular Unit Extraction (FUE) and Follicular Unit Strip Surgery (FUSS) with excellent results. He and his staff can perform extensive mega sessions with dense natural results.
  • Dr. Özlem Biçer MD

    Dr. Ozlem Bicer
    Dr. Ozlem Bicer
    Dr. Biçer provides ultra-refined follicular unit extraction (FUE) at an exceptionally low-price. Dr. Biçer's practice combines quality with affordability with a patient-centered focus and attention to detail.
  • COUVRé Alopecia Masking Lotion: Product Review

    COUVRé Alopecia Masking Lotion

    For many hair loss sufferers, scalp "tinting" solutions are the most effective type of topical concealer. Tinting solutions like COUVRé, also commonly referred to as "masking lotions" or "concealing lotions," eliminate the contrast between thinning hair and the bald scalp by naturally darkening the skin and matching the tone to one's existing hair. By matching bald scalp to an individual's natural hair color, the harsh contrast of thinning hair is eliminated, and a fuller, denser appearance is achieved.

    Although several types of masking lotions currently exist, one of the most popular and trusted is COUVRé. However, what makes COUVRé distinct from other masking lotions, or different types of concealers in general? Is COUVRé a quality concealer for both hair loss suffering men and women? Most importantly, what are other concelears users saying, and where can balding individuals purchase their own supply of COUVRé masking lotion?

    COUVRé: What is it, and how does it work?

    Unlike comparable "shaker" application products (such as Toppik – a popular topical applicator product from the same makers as COUVRé), COUVRé is a tinted lotion, meant to minimize the contrast between dark, thinning hair and the balding scalp. According to the manufacturers, COUVRé is applied to the scalp using a specialized sponge applicator. Once the masking formula is on the scalp and providing sufficient camouflage, users are instructed to simply style hair normally and go about their day.  The manufacturer of COUVRé assert that the application appears subtle, natural, will not appear "greasy or sticky," will not stain clothing or towels, and does not interfere with pores or affect natural hair growth.

    The Benefits of COUVRé

    According to both the manufacturers and satisfied users, COUVRé offers various benefits over comparable concealer products. First, because the makers of COUVRé are confident in the product, they ensure that, unlike some other concealers, COURVe will create a natural appearance without looking greasy or sticky, and does not clog scalp pores or interfere with existing hair shafts. Because of this, not only is COUVRé useful for those with thinning hair, but also for patients awaiting new growth from hair transplant surgery. What's more, COUVRé does not contain any harmful chemicals, can allegedly withstand perspiration, rain, wind, and even physical contact (such as touching the scalp).  COUVRé comes in 8 different colors/tones (to match all hair types) and is equally effective in both male and female hair loss sufferers.  Although COUVRé will withstand a variety of situations without smearing or smudging, it easily washes completely away with water and shampoo.

    COUVRé Color Chart COUVRé Colour Chart

    Why COUVRé has Become Popular and Trusted within the Hair Restoration Community

    While COUVRé does offer many benefits above other concealer products, its popularity and reputation within the hair restoration community is likely due to several important factors. First, unlike some other concealing products, COUVRé application is both simple and fast. For many individuals, the ability to naturally conceal thinning hair without spending an excessive amount of time "getting ready," is a huge benefit. Furthermore, because COUVRé contains natural ingredients and does not interfere with native or implanted hairs, it is safe to use with other proven hair loss medications (like Rogaine/minoxidil and Propecia/finasteride) and during the new growth phase of hair restoration surgery. Because of its ease of use, effective nature, and ability to conceal hair loss in a variety of situations, COUVRé has become a reputable hair loss treatment and remains popular within the hair restoration community.

    What Real Hair Loss Sufferers are Saying About COUVRé

    To read real reviews on COUVRé alopecia masking lotion from other hair loss suffering men and women, visit our hair loss forum and social community.

  • TRX2 Molecular Hair Loss Treatment from Europe

    TRX2 Molecular Hair Loss Treatment from Europe

    Revolutionary Hair Growth Formula?

    Anyone suffering the effects of an incurable and debilitating medical condition yearns for the promise of new and revolutionary treatment options and hair loss sufferers are no exception. Though often dismissed as insignificant by those who are unaffected by it, baldness and thinning hair can devastate the lives of millions of men and women susceptible to the effects of androgenic alopecia. The desperation to restore the flowing locks of youth make this demographic particularly susceptible to slick marketing campaigns promising to halt balding and regrow hair. One such product marketed in this fashion is Europe’s TRX2 Molecular Hair Loss Treatment. But, will hair loss sufferers find follicles behind the flash?

    TRX2 Ingredients

    TRX2 Molecular Hair Loss Treatment is not a drug or medication. It is an herbal, dietary supplement taken orally. A glance at its ingredients list reveals nothing new or revolutionary. Each component is readily available at your local nutritional supplement shop, though you may not find the same concentrations of each in a single product.  It's ingredients are listed below:

    Ingredients: L-carnitine tartrate (800 mg), potassium chloride (191 mg), L-leucine (150 mg), isoleucine (75 mg), valine (75 mg), nicotinic acid (40 mg), and biotin (150 µg).

    TRX2 Scientific Studies?

    With these ingredients so readily available, one might wonder if the significant cost savings of purchasing them individually and mixing your own TRX2 at home is just as effective for hair growth. The official website’s FAQ addresses this notion with the following response.

    “The benefit of taking TRX2™ Molecular Hair Growth Supplement singularly, as opposed to buying each ingredient separately, is based on several facts:

    The precise amount and ratio of ingredients in our supplement are carefully chosen and engineered based on credible scientific studies. The ingredients in our capsule were specifically formulated to work in concert with one another and are manufactured in accordance with strict European quality controls. For the consumer, the convenience of taking all compounds at the optimum ratio in one capsule and delivered via our proprietary potassium channel stimulating complex is crucially important.”

    Perhaps this is true. However, at a hefty €54.95 (about $72) for a one month supply, those seeking to save some money may want to give the home brew option a shot first.

    Additionally, referencing scientific studies is an effective way to add legitimacy to a product but one must always consider the source. While the TRX2 website provides detailed data gathered from a “randomized, double-blind, placebo-controlled study”, it is unclear who conducted the study and there is no mention of publication in a peer reviewed journal.  Peer review is the industry standard for evaluation of clinical trial results and its absence is cause for concern.

    Does TRX2 Work?

    TRX2 claims to stop hair loss and regrow hair through the “rejuvenation of potassium ion channels within hair follicles”. This theory is based on research suggesting that the opening of potassium channels is an important regulatory mechanism for hair growth.

    A bold statement at the top of the TRX2 website states that it has been shown to regrow hair in nearly 9 out of 10 men and women. But, does TRX2 really do what it claims? The bottom of the company’s website provides a very important disclaimer.

    These statements have not been evaluated by the medicines regulatory agencies. This product is not a drug or medicine, and is therefore not intended to diagnose, treat, cure or prevent any disease. This patent-pending food supplement contains nutrients that help promote and sustain healthy hair growth. Results may vary and are subject to your individual metabolism. Regarding risks and side-effects please see the package insert and ask your physician or healthcare specialist.”

    Careful wording in the above statement may give consumers the wrong idea. Helping to “promote and sustain healthy hair growth” is not the same as stopping hair loss or regrowing hair lost due to the effects of androgenic alopecia. A quality shampoo and condition can make hair more manageable and appear fuller.

    TRX2 Side Effects

    While TRX2 contains "drug-free" ingredients that are all natural or synthesized as normal metabolites in the human body, there is a potential for certain side effects.

    Some consumers of TRX2 have reported transitory gastrointestinal effects including an upset stomach.  Thus, it is recommended to take TRX2 after eating.  Additional side effects include the possibility of allergic reactions such as skin flushes.  If any of these conditions occur, it is recommended to consult a physician.

     It is also recommended that any potential customers suffering from digestive system disorders, diabetes or those who are glucose-intolerant consult with their physician before taking TRX2.

    Moreover, pregnant women and nursing mothers should avoid taking TRX2 due to its lack of long term safety data.

    Conclusion

    The role of potassium channels in hair growth is still being investigated and it’s unclear if TRX2 truly has the potential to significantly affect these channels. However, there is a clinically proven and FDA approved medical hair loss treatment that is known to do so. Rogaine (minoxidil) has been used successfully by balding men and women for more than 20 years. The exact mechanisms by which minoxidil affects hair growth are not fully understood but it is a known vasodilator and has also been shown to enhance the flow of potassium ions. Given that minoxidil is relatively inexpensive, clinically proven and comes with very little risk of side effects, it may be a better option for hair loss suffering men and women.

    Additionally, balding men should seriously consider adding Propecia (finasteride) to their hair growth regimen. Propecia stops hair loss  at its core by inhibiting the production of DHT (the hormone responsible for genetic baldness) and is arguably the most effective treatment for male pattern balding currently available.

    When it comes to “new and revolutionary” hair loss treatments, proceed with caution. There is nothing wrong with trying a new treatment provided it is safe and purchased from a reliable source. However, forgoing tried and true medical treatment s in favor of experimental products may result in further loss of precious and irreplaceable hair.

    To share your thoughts and experience with TRX2 on our hair loss forum, join the discussion “TRX2: Any Feedback?”.

  • Traction Alopecia Hair Loss

    Traction Alopecia Hair Loss

    What is Traction Alopecia?

    Traction alopecia is a form of hair loss resulting from the repeated yet unintentional pulling, twisting or rubbing of the hair. Traction alopecia can affect both men and women, though it's more commonly seen in women. Though it can be temporary, balding from traction alopecia may become permanent if these traumatic forces are applied to the hair and scalp repeatedly and for prolonged periods, resulting in scarring.

    What Causes Traction Alopecia?

    Practices that may result in traction alopecia include; wearing tight braids, ponytails or cornrows and extended use of hair extensions.  Due to the popularity of these hairstyles, traction alopecia has become one of the leading causes of hair loss among African America women.

    Balding from traction alopecia can also occur from repeatedly wearing tight-fitting hats, helmets or other headgear.This is likely where the popular hair loss myth about hats causing hair loss derived, but it is important to note that, under normal circumstances, wearing a properly fitted hat will not negatively impact hair growth.

    Treating Traction Alopecia

    The first step in treating traction alopeciais to change the habits leading to the condition. This may mean adopting a new hairstyle or altering your wardrobe. Finally, applying a vaso dilator like Rogaine(minoxidil) to the affected area can increase blood flow to the damaged follicles and effectively speed up new hair growth. Assuming the hair follicles have not been permanently damaged, new hair growth will likely occur though it may take several months.

    In cases of severe and permanent tractional opecia, the only effective method of restoring hair to the bald areas is surgical hair restoration. State of the art, ultra-refined follicular unit hair transplantation allows quality surgeons to harvest DHT resistant hair from the donor region at the rear and sides of the head. These hairs are then implanted into the balding areas of the scalp, resulting in a natural and undetectable appearance. To see which physicians we recommend and for a free virtual consult, visit the Coalition of Independent Hair Restoration Physicians.

    To learn more about how surgical hair restoration can be used to treat traction alopecia hair loss, view the following results from our hair loss forum and social community:

  • Toppik Hair Loss Concealer

    Toppik Hair Loss Concealer

    Truly a "Full Head of Hair in 30 Seconds?"

    Of all the hair loss concealers available, like topical powder applications or "sprinkle solutions," Toppik is amongst the most popular. What's more, of all the "shaker" options currently available to hair loss suffering men and women, Toppik is one of the most recognized and trusted.

    Since its inception, Toppik has been featured in various media outlets, including Time magazine, the Oprah Winfrey show, Fox News, NBC, and Eyewitness news. Throughout this media exposure and positive word of mouth, this hair loss product has been utilized by an estimated 3 million balding men and women worldwide.  So what makes Toppik so popular? How does it work? How does it compare to other types of concealers? Most importantly, what are real consumers saying about Toppik and where can interested parties purchase this popular concealer?

    Toppik Hair Loss Concealer: What is it, and how does it work?

    Toppik, like many other concealers available today, is a topical powder application. The powder formula is comprised of a series of charged, keratin-based, "hair binding fibers" that, when sprinkled on thinning hair, tightly adhere to individual hair strands. With each "shake" of the Toppik product, thousands of these particles are applied to the head and bind to hair shafts via opposing electrical activity (much like the way magnetized material attracts metal).

    By tightly binding to hair shafts in such significant numbers, Toppik naturally recreates the appearance of a thick, dense head of hair.  According to the makers of Toppik, the bond created by the hair shaft and keratin particle is so strong that it will withstand wind, rain and perspiration, and will continue to naturally thicken and volumize the hair until "washed out" by shampoo. Additionally, because Toppik is available in a variety of different tones, the product is able to precisely match any hair color/texture and still remain completely undetectable.

    What Benefits Does Toppik Offer Over Other Concealers?

    Although Toppik is popular and well known within the hair restoration community, hair loss sufferers should still ask one crucial question: what benefits does Toppik offer over other, similar concealers? According to the manufactures, Toppik offers a variety of benefits that other, comparable products simply cannot match. First, Toppik's keratin fibers are completely safe, organic, all natural, and utilize electric energy to adhere to hair fibers with unmatched efficacy.

    Next, not only is Toppik available in a variety of colors, but these tones can also be "mixed" to match any color and can even cover gray hair and new growth from hair transplant surgery.  Toppik colors include black, dark brown, medium brown, light brown, medium blonde, blonde, auburn, gray and white.

    Toppik Color

    Furthermore, Toppik can be used in conjunction with other hair styling products (though the powder needs to be applied to dry scalp, and styling products should be applied before usage), will not "rub off" on clothing or pillows, can be safely utilized with other hair restoration products and medications,  will not clog pores or dry out the scalp, is equally effective in balding men and women, and is easily applied via the shaking method or by applying the popular "spray applicator" to the shaker apparatus.

    Why is Toppik so Popular in the Hair Loss Community?

    Because of its innovative design, positive "track record," ease of use, and effective nature, Toppik has developed a trusted reputation and large fan base in the hair restoration community. Hair loss sufferers not only trust the history behind the Toppik brand, but appreciate the product's single use longevity and lasting strength of the fiber-hair shaft bond. The fact that the product is effective for male and female hair loss sufferers and can be easily used with other styling and hair restoration products makes Toppik an even better option for any individual considering a topical concealer.

    What Real Consumers are Saying About Toppik?

    To see what real hair loss suffering men and women are saying and to read helpful tips about applying Toppik in a variety of situations and in conjunction with other hair loss treatments, visit our Hair Loss Forum and Social Community.  You can also read our product review by visiting "Product Review: Nanogen Versus Toppik".