- 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.
-
Finasteride For Women: What’s The Perfect Dose?
-
Topical Finasteride Side Effects: What to Know
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Low-Dose Topical Dutasteride: Better Than Oral Finasteride? (New Study & Photos)
-
Best Minoxidil for Women: Top 6 Brands of 2025
-
Topical Finasteride: The Best Dosage for Maximizing Regrowth and Minimizing Side Effects
-
Blueprint Haircare Stack: Product Review
-
Best Minoxidil for Men: Top Picks for 2025
-
Natural vs. Pharmaceutical DHT Blockers: Ranked
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 Perfect Hair Health TeamNov 8, 2025Nutrafol 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 Perfect Hair Health TeamNov 8, 2025Vitamin B1 for Hair Loss: Good or Bad for Hair Loss?
Vitamin B1 – also known as thiamine (or thiamin) – is part of the B-complex of vitamins. In mouse models, severe vitamin B1 deficiencies lead to rapid weight loss, neurological decline, and hair loss. However, thiamine repletion studies (as well as studies on humans) suggest that this hair loss seem...
By Perfect Hair Health TeamNov 4, 20255 Natural DHT Blockers… But Should You Use Them?
Natural DHT blockers are popular among hair loss sufferers who want to lower DHT without the use of drugs. Unfortunately, most natural DHT reducers lack enough DHT-reducing capabilities to regrow hair. This article separates fact from fiction to reveal the best (and worst) natural DHT blockers for p...
By Sarah King, PhDSep 18, 2025Does Topical Dutasteride Work?
Topical dutasteride is gaining attention as a potent alternative to oral dutasteride (and finasteride) in treating androgenic alopecia, aiming to deliver robust DHT suppression at the scalp with fewer systemic side effects. But does topical dutasteride work? In this article, we break down how topica...
By Sarah King, PhDJul 16, 2025Topical Minoxidil for Hair Growth: Efficacy, Safety, and How to Enhance Results
Topical minoxidil is the most established over-the-counter treatment for hair loss, with decades of use behind its FDA approval. But how does it actually work, and what determines whether it will work for you? In this article, we explore the science behind topical minoxidil, its strengths and limita...
By Sarah King, PhDJun 23, 2025OS-01 Hair Review: Does It Live Up to the Hype?
Curious about OneSkin’s OS-01 scalp serum that’s all over your feed? It claims to combat hair thinning by targeting cellular senescence, essentially attempting to “rejuvenate” your follicles. In this deep dive, we break down what senescence actually is, how it affects hair loss, and whether the scie...
By Sarah King, PhDJan 14, 2025Can Intermittent Fasting Cause Hair Loss? A Look Into A New Study
Intermittent fasting has gained popularity for its potential health benefits, but recent research highlights its possible impact on hair health. Studies on mice and humans suggest that fasting-induced metabolic shifts can slow hair growth and weaken hair shafts by depleting activated hair follicle s...
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...
By Perfect Hair Health TeamNov 21, 2024Genetic Tests: A Breakthrough for Personalized Hair Loss Treatments?
Genetic testing is trending in the hair loss industry. The premise? Our genes hold the secrets to better hair growth, and genetic tests can help hair loss sufferers unlock new levels of hair gains with customized treatments. It’s an enticing proposition, albeit one that holds little-to-no scie...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.
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