- About
- Mission Statement
Education. Evidence. Regrowth.
- Education.
Prioritize knowledge. Make better choices.
- Evidence.
Sort good studies from the bad.
- Regrowth.
Get bigger hair gains.
Team MembersPhD's, resarchers, & consumer advocates.
- Rob English
Founder, researcher, & consumer advocate
- Research Team
Our team of PhD’s, researchers, & more
Editorial PolicyDiscover how we conduct our research.
ContactHave questions? Contact us.
Before-Afters- Transformation Photos
Our library of before-after photos.
- — Jenna, 31, U.S.A.
I have attached my before and afters of my progress since joining this group...
- — Tom, 30, U.K.
I’m convinced I’ve recovered to probably the hairline I had 3 years ago. Super stoked…
- — Rabih, 30’s, U.S.A.
My friends actually told me, “Your hairline improved. Your hair looks thicker...
- — RDB, 35, New York, U.S.A.
I also feel my hair has a different texture to it now…
- — Aayush, 20’s, Boston, MA
Firstly thank you for your work in this field. I am immensely grateful that...
- — Ben M., U.S.A
I just wanted to thank you for all your research, for introducing me to this method...
- — Raul, 50, Spain
To be honest I am having fun with all this and I still don’t know how much...
- — Lisa, 52, U.S.
I see a massive amount of regrowth that is all less than about 8 cm long...
Client Testimonials150+ member experiences.
Scroll DownPopular Treatments- Treatments
Popular treatments. But do they work?
- Finasteride
- Oral
- Topical
- Dutasteride
- Oral
- Topical
- Mesotherapy
- Minoxidil
- Oral
- Topical
- Ketoconazole
- Shampoo
- Topical
- Low-Level Laser Therapy
- Therapy
- Microneedling
- Therapy
- Platelet-Rich Plasma Therapy (PRP)
- Therapy
- Scalp Massages
- Therapy
- More
IngredientsTop-selling ingredients, quantified.
- Saw Palmetto
- Redensyl
- Melatonin
- Caffeine
- Biotin
- Rosemary Oil
- Lilac Stem Cells
- Hydrolyzed Wheat Protein
- Sodium Lauryl Sulfate
- More
ProductsThe truth about hair loss "best sellers".
- Minoxidil Tablets
Xyon Health
- Finasteride
Strut Health
- Hair Growth Supplements
Happy Head
- REVITA Tablets for Hair Growth Support
DS Laboratories
- FoliGROWTH Ultimate Hair Neutraceutical
Advanced Trichology
- Enhance Hair Density Serum
Fully Vital
- Topical Finasteride and Minoxidil
Xyon Health
- HairOmega Foaming Hair Growth Serum
DrFormulas
- Bio-Cleansing Shampoo
Revivogen MD
- more
Key MetricsStandardized rubrics to evaluate all treatments.
- Evidence Quality
Is this treatment well studied?
- Regrowth Potential
How much regrowth can you expect?
- Long-Term Viability
Is this treatment safe & sustainable?
Free Research- Free Resources
Apps, tools, guides, freebies, & more.
- Free CalculatorTopical Finasteride Calculator
- Free Interactive GuideInteractive Guide: What Causes Hair Loss?
- Free ResourceFree Guide: Standardized Scalp Massages
- Free Course7-Day Hair Loss Email Course
- Free DatabaseIngredients Database
- Free Interactive GuideInteractive Guide: Hair Loss Disorders
- Free DatabaseTreatment Guides
- Free Lab TestsProduct Lab Tests: Purity & Potency
- Free Video & Write-upEvidence Quality Masterclass
- Free Interactive GuideDermatology Appointment Guide
- More
Articles100+ free articles.
-
Can Methylene Blue Regrow Your Hair? A Look At The Science.
-
Hair Loss Breakthroughs or Media Hype? Stem Cell Secretome Treatments
-
Minoxidil Side Effects: Everything You Need To Know
-
New Study: Does Finasteride Cause Birth Defects?
-
Can Intermittent Fasting Cause Hair Loss? A Look Into A New Study
-
Burdock Root For Hair Loss? A Look Into The Evidence
-
Which Vitamin Deficiences Can Cause Hair Loss?
-
Genetic Tests: A Breakthrough for Personalized Hair Loss Treatments?
PublicationsOur team’s peer-reviewed studies.
- Microneedling and Its Use in Hair Loss Disorders: A Systematic Review
- Use of Botulinum Toxin for Androgenic Alopecia: A Systematic Review
- Conflicting Reports Regarding the Histopathological Features of Androgenic Alopecia
- Self-Assessments of Standardized Scalp Massages for Androgenic Alopecia: Survey Results
- A Hypothetical Pathogenesis Model For Androgenic Alopecia:Clarifying The Dihydrotestosterone Paradox And Rate-Limiting Recovery Factors
Menu- AboutAbout
- Mission Statement
Education. Evidence. Regrowth.
- Team Members
PhD's, resarchers, & consumer advocates.
- Editorial Policy
Discover how we conduct our research.
- Contact
Have questions? Contact us.
- Before-Afters
Before-Afters- Transformation Photos
Our library of before-after photos.
- Client Testimonials
Read the experiences of members
Before-Afters/ Client Testimonials- Popular Treatments
-
Articles
Explore the science behind hair loss and hair growth. Our in-depth articles cover topics ranging from natural remedies to pharmaceuticals to breakthroughs in hair loss science. Want to request an article topic? Contact us.
IngredientsPharmaceuticalsNatural RemediesCompany Reviews
By Sarah King, PhDMar 29, 2024Nutrafol Growth Activator Hair Serum: A Scientific Analysis & Debunking
Nutrafol’s Growth Activator Hair Serum is marketed as a hair growth topical to men and women. Its key differentiating point: ashwagandha exosomes, which Nutrafol says helps support cell renewal to activate visibly thicker hair. Nutrafol references a study claiming that 87% of serum users saw h...
By Perfect Hair Health TeamFeb 26, 2024What Happens If I Stop Using Finasteride?
After quitting finasteride, two-year clinical studies suggest that hair loss resumes 1-3 months after withdrawal. Within 3-12 months of quitting, hair counts return to where they were prior to starting the drug, and hair loss continues. But what about those who quit finasteride temporarily? What abo...
By Perfect Hair Health TeamFeb 15, 2023Can I Make Topical Finasteride By Crushing Pills?
It’s possible to make homemade topical finasteride by crushing pills. However, some pills have a protective coating that may prevent them from dissolving in a topical. Under these circumstances, any coating must be removed prior to crushing, and even then, not all crushed debris will dissolve. For t...
By Perfect Hair Health TeamJan 15, 2023Can a Blood Test for Finasteride Determine the Risk of Side Effects?
Can blood tests reliably determine the risk of sexual side effects from hair loss drugs? Low-quality evidence (i.e., anecdotes and observational studies) suggest, in men, that low levels of free testosterone and/or high levels of sex hormone binding globulin are correlated with higher rates of sexua...
By Perfect Hair Health TeamApr 1, 2022Does Viviscal® Work? Evidence-Based Findings Reveal the Truth
Viviscal™ is a hair loss supplement backed by numerous doctors and 12+ human studies. In this investigative article, we take a close look at Viviscal’s clinical trials, marketing efforts, and product ingredients. We even conducted a series of lab tests. Through these efforts, many issues came to lig...
By Perfect Hair Health TeamMay 28, 2020Nutrafol Review: Half-Truths, Cherrypicked Data, & Misleading Study Results
Nutrafol is a hair loss supplement praised by media, endorsed by doctors, and supported by clinical studies. At first glance, it seems like the perfect option for anyone interesting in fighting hair loss naturally. Unfortunately, during our investigation, we found that (1) Nutrafol’s 2018 clin...
By Sarah King, PhDMar 4, 2025Hair Loss Breakthroughs or Media Hype? Stem Cell Secretome Treatments
Stem cell secretome treatments are making headlines as the next big breakthrough in hair regrowth—but do they really work? While the science behind exosomes and growth factors sounds promising, media hype often overshadows the need for rigorous clinical trials. Curious about the real evidence behind...
By Sarah King, PhDFeb 6, 2025Minoxidil Side Effects: Everything You Need To Know
Minoxidil is an FDA-approved treatment for androgenic alopecia, but its use can come with side effects – from mild scalp irritation to cardiovascular risks. This comprehensive guide assess common and rare side effects from topical minoxidil and oral minoxidil – along with mitigation strategies....
By Ben Fletcher, PhDJan 13, 2025Burdock Root For Hair Loss? A Look Into The Evidence
Burdock root, derived from the plant Arctium lappa, has long been used in traditional medicine for its purported anti-inflammatory, antimicrobial, and antioxidant properties. In recent years, it has been included in natural hair loss treatments, with claims that it promotes hair growth. Some studies...
By Sarah King, PhDDec 11, 2024Which Vitamin Deficiences Can Cause Hair Loss?
Hair loss is a complex issue influenced by various factors, including vitamin deficiencies. We explored the impact (or lack thereof) of deficiencies in five vitamins – Vitamin D, Biotin, Vitamin B12, Vitamin E, and Vitamin A – on hair health and whether supplementation can aid hair regrowth. While d...Stop guessing which hair loss
treatments actually workInstead, just read our cheat sheet
You’ll get the facts on nine “natural” and “conventional” hair loss treatments: how they work, how much hair they’ll regrow, their limitations, and what their marketers don’t want you know.
- Mission Statement
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