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Dr. Robert Dorin
Robert J. Dorin, DO has been a specialist in hair restoration since 2002 and a member of our network since 2006. He offers advanced FUE and FUT procedures as well as PRP therapy. Prospective patients seek out Dr. Dorin for his personalized care and ultra-refined results. -
The Coalition of Independent Hair Restoration Physicians
Chosen by Patients and Peers for meeting the highest standards.
This Learning Center is sponsored by the Coalition of Independent Hair Restoration Physicians.
This elite group of independent surgeons have been carefully selected by patients and leading physicians and are committed to providing Ultra Refined Follicular Unit Hair Transplantation.
This minimally invasive hair restoration procedure enables patients to achieve very natural and dense hair growth after only one surgical session.
Coalition members agree to have their results openly critiqued and reviewed on the world’s most respected online patient based community - the Hair Restoration Network. Learn more about the high standards Coalition physicians must meet for membership.
Find an an elite Coalition Physician in your area and consult for free about how to restore your own natural hair.
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Dr. Felipe Pittella
Dr. Felipe Pittella
Dr. Felipe Pittella performs ultra-dense mega-session and Giga-session FUE procedures on Norwood 6 and 7 patients with excellent density and coverage. Dr. Pittella combines quality and affordability with coverage and density. -
Scalp Micropigmentation (SMP)
A Cosmetic Tattooing Procedure to Conceal Hair Loss
Scalp Micropigmentation, the process of tattooing thinning or bald areas of the scalp to resemble shortly cropped hair, has been met with high amounts of enthusiasm from patients seeking alternative ways to mask and conceal their hair loss. This artistic and minimally invasive procedure, also referred to as SMP, provides men and women suffering from hair loss with an illusion of fullness or the appearance of thick, shortly cropped hair. SMP results (not the procedure) are often compared to topical concealers such as Toppik, DermMatch and Nanogen, because they also help conceal baldness and make thinning hair appear thicker and fuller.
Although scalp micropigmentation is increasing in popularity, it is still a new and evolving practice and its mystique may leave interested patients asking several important questions.
How does scalp micropigmentation work? What are the benefits, limitations and potential risks associated with the procedure? Who is a suitable candidate? What are the costs associated with SMP? What happens if consumers don't like the results? Is the ink associated with scalp micropigmentation permanent? Are all SMP practitioners equal or do some produce better, more natural looking results?

Scalp Micropigmentation is the artistic application of tattoo-like ink or pigmentation "dots" to bald or thinning areas of the scalp to recreate the appearance of shortly cropped hair (or "stubble") by a trained practitioner. SMP practitioners are typically experienced in the art but often aren't medical professionals or hair restoration physicians. Scalp micropigmentation is typically used for one of three purposes. These include:
- Creating the illusion of fullness or density to thinning hair by applying cropped, hair-like tattoos in between and around thinning hair.
- Creating the appearance of closely cropped or shaved hair on an otherwise bald scalp.
- Camouflaging a pre-existing hair transplant scar. Typically, this is a rare, but stretched, linear scars from follicular unit hair transplantation procedures via strip harvesting (FUT) can sometimes require revision.
Scalp micropigmentation ink is normally placed in the superficial dermis, a layer of skin between the epidermis (the outer layer of the skin) and subcutaneous tissues that consists of connective tissue and cushions the body from stress and strain. However, SMP practitioners often place ink at varying depths. Some practitioners are now beginning to use a “sweeping” technique when tattooing, in order to create a more three-dimensional appearance on the scalp.
Depending on the size of the balding/thinning area and the desired appearance, the procedure can take anywhere from 1-8 hours, and can now be completed with both permanent and temporary SMP ink.
According to Coalition hair transplant surgeon Dr. Robert Bernstein, the key to further achieving a natural result with SMP lies in holding the inking tool at an appropriate angle, controlling the depth at which the ink is placed, monitoring the amount of ink deposited at each site, and selecting appropriate ink tones.
To read more of Dr. Bernstein's input and discussion related to SMP at the 2012 annual ISHRS Scientific Meeting for hair restoration physicians, visit "Scalp Micropigmentation (Scalp Tattooing)at the 2012 ISHRS (International Society of Hair Restoration Surgery) Scientific Meeting".
Permanent Versus Temporary Scalp Micropigmentation (Advantages and Disadvantages)
Defining and understanding the difference between permanent and temporary ink is important for any consumer considering the procedure.
Permanent scalp micropigmentation is performed with micropigmentation ink that is not designed to fade or change over time. The ink is placed slightly deeper in the scalp tissue, and the procedure can be performed with ink containing both colored and black pigment.
Advantages of permanent SMP include the ability to undergo a single SMP treatment without frequent “touch ups" and potentially lower long-term costs.
Disadvantages include the possibility that the ink will eventually fade to a green or blue hue (due mainly to the black pigment used in permanent SMP ink) and the inability to reverse the procedure without laser pigment removal (i.e. “laser tattoo removal”) if the work is unsatisfactory.
Temporary scalp micropigmentation is performed with ink that is specially designed to gradually fade and disappear within 6 to 24 months after the procedure. The ink is placed into a superficial layer of the scalp, which allegedly helps to define the pigmentation and decrease the probability of “blurring” ink. Temporary SMP is performed with ink containing no black pigment. Because black pigmentation can eventually fade into a blue or green tone, it would inevitably produce an unnatural looking result as it gradually fades and disappears, and should be avoided.
Advantages of temporary SMP include: the ability to redesign or discontinue the process (when the ink fades after 6-24 months) if the results are not satisfactory; the decreased rates of ink blurring, running, and definition loss with the superficial placement into the scalp; and the ability to use the three-dimension technique (which was designed by Beauty Medical in Milan, Italy, and is now utilized by several leading clinics recommended by this patient community).
Disadvantages of temporary SMP include ongoing maintenance and costs associated with undergoing subsequent SMP applications every 6 to 24 months, and the possibility of discoloration as the ink fades (though the temporary ink is purposely designed to fade evenly and without discoloration).
To learn more about the advantages and disadvantages of permanent and temporary SMP, visit "Temporary Scalp Micropigmentation: Advantages, Disadvantages, and Clinics Currently Offering the Procedure".
Scalp Micropigmentation Costs
The cost of SMP is variable and depends upon the type of procedure (temporary versus permanent), size of the procedure, and the practitioner/clinic performing the micropigmentation. While rates typically vary and change, permanent SMP can cost anywhere from $800 for a small procedure and $6000 for a large one. The cost of temporary SMP is approximately half the cost of permanent SMP and typically ranges from $500 to $2500 depending on the size of the procedure. Subsequent procedures, which are needed 6 to 24 months after the initial results fade are typically 50% of the original costs.
What Makes a Good SMP Candidate?
Although a wide variety of men and women are interested in scalp micropigmentation, the procedure is actually only ideally suited for a small, select number of hair loss consumers.
SMP is likely best suited for individuals interested in aiding the appearance of density in shortly cropped, diffusely thinned hair, and for patients trying to camouflage a hair transplant scar. It may also be suitable in creating a greater illusion of fullness in those who've already undergone surgical hair restoration.SMP consumers should also consider a naturally asymmetrical hairline design and “fading” effect (from decreased pigmentation in the hairline to denser, increased pigmentation in the middle scalp) if hairline restoration is performed. This approach will likely create a more natural result in eligible candidates.
Creating Realistic Expectations
While scalp micropigmentation may be a useful adjunct therapy for a select group of consumers interested in concealing their hair loss, it should be approached with realistic expectations and performed by a trusted clinic. Individuals considering the procedure must remember that SMP is a two-dimensional process and cannot provide the texture and growth of real hair. Undergoing SMP without respecting its limitations may create unrealistic expectations and disappointing results.
Evolving Procedure or Just a Fad?
Is SMP just a fad or will it continue to evolve and cultivate additional interest from hair loss sufferers and hair restoration physicians?
While some hair loss experts are quickly embracing the procedure, others are more resistant, and liken scalp micropigmentation to less popular "niche" treatments like hair systems, laser caps, and topical concealers. Whether or not it will continue increasing in popularity and retain its momentum is not yet clear.
Hair restoration is a rapidly changing field and new and evolving therapies may eventually render scalp micropigmentation and other hair loss treatments obsolete. Altogether, only time will tell whether SMP is a lasting adjunct therapy or a passing fad.
Clinics Currently Offering Scalp Micropigmentation
As of January 2013, the following hair restoration clinics recommended by this website are offering some form of Scalp Micropigmentation: Hasson and Wong (Drs. Victor Hasson and Jerry Wong), and Shapiro Medical Group (Drs. Ron and Paul Shapiro).
Dr. Feller, Dr. Lindsey, Hasson and Wong, and Shapiro Medical Group trained with Beauty Medical and offer the temporary SMP procedure; Dr. William Rassman performs his own variation of Scalp Micropigmentation with permanent ink.
Note that in many cases, a trained technician and not the physician will be performing scalp micropigmentation.
This website does not currently recommend one SMP clinic over another. Those considering scalp micropigmentation as a tool to conceal hair loss and create an illusion of hair are encouraged to do their own diligence in researching each technique, practitioner and clinic.
To discuss scalp micropigmentation with hair loss sufferers and other interested parties and to view results showing before and after pictures, visit the Scalp Micropigmentation Forum.
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Dr. Timothy Carman
Dr. Timothy Carman
Dr. Timothy Carman performs large sessions of ultra refined follicular unit transplantation with excellent results -
Tricomin Follicle Therapy Spray, Shampoo and Conditioner

Tricomin is an all natural hair loss treatment designed for both men and women with thinning hair to stimulate hair regrowth and improve the appearance of thinning hair. It can also be used in conjunction with with Rogainehair regrowth treatment.
Tricomin Solution Follicle Therapy Spray combines the benefits of the Triamino Copper Nutritional Complex with an exceptional leave-in conditioner. The therapy spray enriches your hair and scalp with a unique blend of mineral and body-building ingredients and essential amino acids. Spraying the therapy spray liberally after shampooing daily will condition and treat your hair and scalp. It's recommended to apply this product to damp or dry hair.
The Tricomin Revitalizing Shampoo stimulates and restores health, structure, and vitality to thinning, fine, and damaged hair. It's recommended to use the Revitalizing Shampoo daily, gently massaging it into moistened hair scalp, leaving on for 3 to 5 minutes before rinsing. A second application may be made if desired.
The Restructuring Conditioner uses a unique moisture and nutrient-rich framework to help restore your hair's natural mineral and protein balance. This conditioner helps to add structure and body onto thinning and/or damaged hair.For best results, use all three Tricomin products in conjunction with one another. All 3 Tricomin products is called the Tricomin TricoPak.
How It Works:
Al three Tricomin products contain the active ingredient copper peptides. Scientific evidence suggests that copper peptides can shorten the shedding (telogen) phase and elongate the growth (anagen) phase of the follicles. Partial FDA trials showed Tricomin products' effectiveness in promoting new hair growth.
Developing Realistic Expectations:
Tricomin copper peptide technology may provide marginal benefit to men and women with thinning hair. To date, only surgical hair restoration is proven to grow hair in completely bald areas. You are invited to have a free virtual consultation with one of our prescreened hair restoration physicians.
Ingredients
Tricomin Follicle Therapy Spray: Purified Water, SD Alcohol 40B, Amodimethicone, Nonoxynol-10, Panthenol, Polyquaternium-11, Polysorbate 60, Tallowtrimonium Chloride, Citric Acid, Dimethyl Lauramine Isostearate, Linoleamidopropyl Ethyl Dimonium Ethosulfate, Triamino Copper Nutritional Complex (Alanine/Histidine/Lysine Polypetide Copper HCl), Methylparaben, Benzethonium Chloride, Menthol, FD&C Blue #1.
Tricomin Revitalizing Shampoo: Purified Water, Sodium Laureth Sulfate, Disodium Cocoamphodiacetate, Cocomidopropyl Betaine, Ceteth-16, Glycerin, Laneth-16, Oleth-16, Steareth-16, PEG-75 Lanolin, Sodium Chloride, Triamino Copper Nutritional Complex (Alanine/Histidine/Lysine Polypetide Copper HCl), Citric Acid, Diazolidinyl Urea, Hydrolyzed Keratin, Panthenol, Methylparaben, Fragrance, Propylparaben, Peppermint Oil, D&C Red #33, FD&C Blue #1.
Tricomin Restructuring Conditioner: Purified Water, Glyceryl Stearate, PEG-100 Stearate, Stearamidopropyl Dimethylamine, Cetyl Alcohol, Propylene Glycol, Stearyl Alcohol, Dimethylamine, Triamino Copper Nutritional Complex (Alanine/Histidine/Lysine Polypetide Copper HCl), Hydroxyethylcellulose, Panthenol, Aloe Vera Gel, Soydimonium Hydroxypropyl Hydroxylyzed Wheat Protein, Hydroxylyzed Keratin, Citric Acid, Methylparaben, Fragrance, Disodium EDTA, Propylparaben, Peppermint Oil, Tocopheryl Acetate, Cholecalciferol, Retinyl Palmitate, Vegetable Oil, FD&C Blue #1, D&C Red #33.
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Provillus as a Hair Loss Treatment
One of the more popular hair loss products on the market today for those with thinning hair is Provillus. Available for both men and women, making promises to “re-grow beautiful healthy hair”, this product consists of a topical and oral solution with an FDA approved hair regrowth ingredient and a number of conjectured “all-natural” dihydrotestosterone (DHT) blockers.
Other ingredients that promote a healthy scalp and head of hair are also contained in this product. The theory behind Provillus is to revive the hair follicles with growth stimulators and attack hair loss at its source by blocking DHT.
In order to fully evaluate the efficacy of this product, we must further explore each ingredient to determine whether or not this hair loss treatment delivers what it promises. Below you will find a list of ingredients and information that will help you determine whether or not Provillus is right for you.
Topical Ingredients:
Minoxidil (found in Rogaine, Xandrox and other solutions) is an FDA approved hair growth treatment and many balding men and women use it with great success. This particular ingredient is what allows Provillus to advertise their product as FDA approved.
Azelaic acid has been found to clean the skin and potentially inhibit DHT, the hormone responsible for androgenic alopecia.
Combining these two “forces” therefore in theory, may be a more powerful treatment than minoxidil alone. However, no clinical studies have been performed on azelaic acid as a standalone product therefore, whether or not it can stop hair loss is purely conjecture.
Oral Ingredients:
The Provillus oral solution contains a number of supposed DHT blockers including saw palmetto for hair loss, Vitamin B6 and Zinc, pumpkin or cucurbita maxima, and nettle root. Because evidence exists that these ingredients may be an effective treatment for benign prostatic hypertrophy (BPH), theories have been produced that they might also effectively treat baldness. Though we can appreciate the aspiration for balding men and women to use herbal products as an “all-natural” replacement for Propecia (finasteride), the problem we have is that most of them only contain anecdotal if any evidence at all that they can successfully treat baldness.
Provillus oral solution also contains a number of components that are said to promote healthy hair growth and cleanse the scalp. These include eleuthero, uva-ursi, muria puama, horsetail, para-aminobenzoid acid (PABA), and magnesium. Understand however, that promoting a healthy scalp and hair is not the same as stimulating newhair growth and hair regrowth, nor does it signify an effective hair loss treatment.
Possible Side Effects
The only side effect that we could find listed on the Provillus website is an upset stomach. It is reported that taking it with food often stops this. Be sure to follow the links to the ingredients listed above as many of them also have potentially reported side effects. Consulting with a physician before taking any herbal hair loss medication is advised.
Dosage
Currently there are no standards on dosages of herbal medications in the United States. In addition, no formal clinical studies have been performed on them for treating baldness. Therefore, the suggested daily value listed on the ingredient package is based on something other than government regulation and scientific study.
Costs
A one month supply of Provillus topical and oral supplement for men or for women costs about $50 per month. Discounted prices are available when bought in bulk.
For the cost of Provillus, one can purchase generic finasteride and generic minoxidil which are FDA approved hair loss treatments for safety and efficacy.
Conclusions and Our Opinion
Given that Provillus topical treatment contains FDA approved hair regrowth ingredient minoxidil; we can at least agree that it may have some marginal benefit for men and women suffering from androgenic alopecia. However, due to the lack of compelling evidence in these other conjectured hair loss solutions, it may be more beneficial and cost effective to spend your money on Propecia (finasteride)for men only and Rogaine (minoxidil) that has helped balding men and women worldwide.
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Rogaine Foam for Men and Women
The exciting new Rogaine foam has undergone its own extensive FDA trials and can rightfully boast an impressive 85% hair regrowth success rate in people who use it twice daily. This is more than 20% higher than the liquid 5% minoxidil solution at 64%. Rogaine foam also comes without the inconveniences of its liquid counterpart such as scalp irritation, flaking, and messy application. The foam dries almost instantly as opposed to the liquid's 15 minute waiting period.
Note: Despite what the insert says, Rogaine works just as well for frontal hair loss, recession, and thinning hair.
How It Works:
Rogaine foam uses versafoam technology to aid the delivery of the minoxidil to the hair follicles. As the minoxidil absorbs into the scalp, it stimulates follicles, revitalizing them, promoting thicker and healthier hair growth. This promotes a thicker and fuller appearance of hair.
Developing Realistic Expectations:
While Rogaine foam is supreme in many ways, it's unlikely to regrow thick terminal hair in completely bald areas. For best results, men ought to consider combining Rogaine with Propecia (finasteride), the only FDA approved and clinically proven DHT inhibitor to stop hair loss. See the "recommended treatments" section below for more details.
Don't expect immediate results. Just as hair loss is a slow process, regrowing it is too. Thus, it's recommended to use Rogaine for approximately 6 to 12 months before determining its effectiveness. Documenting your progress with bi-monthly photos can help you better evaluate the results.
Hair shedding is a common symptom the first few months and a sign that the medication may be working for you. It's crucial to push past this stage with continued use for the recommended period of time.
To date, only surgical hair restoration is proven to grow hair in completely bald areas. You are invited to have a free virtual consultation with one of our prescreened hair restoration physicians.
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Avacor. Is it worth the price?
One product you used to see quite often in advertising is Avacor. According to Response magazine, Avacor was the third best selling product on the Internet in April, 2002. Avacor was originally manufactured by Global Vision Products. After being taken over by new management, it is now being manufactured by Avacor Products LLC.
Like most products that advertise 'Stop Hair Loss and Regrow Hair!', Avacor contains the only FDA approved topical drug minoxidil. Avacor, like other products with similar claims, mixes FDA approved drugs in their generic form with other ingredients in a multiple regimen of products like shampoo, lotion and vitamins.
Avacor historically cost approximately $239 for a two to three month supply and over $1000 for a year’s worth. New prices are much more reasonable which range from $180 for a 3 month supply to $400 for a year’s supply of the men’s and women’s formula. Note that the ingredients in Avacor can be bought over the counter at your local store at a fraction of the cost for which they are sold in Avacor. However, they do offer 24/7 customer service and a 90 day money back guarantee.
Marketing Practices
Avacor, like other products with similar claims, has taken a lot of slack over the years for their controversial marketing tactics. Avacor has a checkered past and has previously been the focus of lawsuits and investigative reporting by major media like ABC news. Recently however, new management has taken over and claims they are very serious about selling quality products at more reasonable prices, without the hype and controversial marketing strategies. In looking at their website, while Avacor still uses slick marketing language to promote their products, the vast majority of their claims are much more realistic.
Avacor includes 3 distinct products that claim to provide “total hair care”. This includes a 'Scalp Detoxifying Shampoo', a 'Physicians Topical Formulation' and finally a 'Nutricap'. Avacor's Nutricap ingredients consist mainly of common herbs like saw palmetto, gingko biloba, keratin, resveratrol, and bilberry. While conjectured to inhibit the production of DHT, none of these ingredients are FDA approved or proven to stop hair loss. Avacor’s Physician’s Topical Formulation however, does contain 5% of the FDA approved hair regrowth agent minoxidil.
Other than minoxidil, no other ingredient is proven to regrow hair. A number of studies have been done that suggest saw palmetto inhibits the production of DHT, like Propecia. But, unlike Propecia, it has never been proven to stop or reverse hair loss.
Avacor Products
Avacor admits on their website that the only product proven to regrow hair is the Avacor Physician’s formulation which includes the FDA approved ingredient minoxidil (5% for men and 2% for women). The other products claim to provide hair with the essential nutrients for healthy hair growth but are careful not to claim to prevent the progression of male or female pattern baldness (androgenic alopecia). Perhaps this is why the Avacor Physician’s formulation can now be purchased separately. Costs of the Physician’s Formulation are still, but only a little more expensive than Rogaine topical hair loss treatment, one of the first and most popular topical minoxidil products.
The Avacor Study
At this time, Avacor’s proof comes in the form of the FDA approved study showing that minoxidil can stop and reverse hair loss. No other study is provided with their product. Their website also is much more realistic as to what their product line can accomplish for hair loss suffering consumers.
Confidence in Products and Services
Before you consider spending hundreds of dollars for any product or service, do a review. Legitimate products will have legitimate studies and have been reviewed on many quality websites. Doctors with real talent and satisfied patients will be able to show you dozens of photos and allow you to talk with past patients. Proven physicians will make available their resumes along with their formal education and associations they belong to.
It is always best to review a product or doctor for information on their background before you make a decision for something as important as hair loss and hair restoration.
Conclusion
At the very least, the Avacor Physician’s formulation will be as effective as the Rogaine liquid formula or generic minoxidil. However, to date, both Rogaine and generic minoxidil are more cost effective than Avacor. The nutricap, shampoo, conditioner and other products may promote healthy hair and provide it with volume, but make no claims of stopping hair loss or regrowing hair.
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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.

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".
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