- 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.
-
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
-
Oral Dutasteride for Hair Loss: Results, Side Effects, Dosing & How It Compares to Finasteride
-
Topical & Mesotherapy Dutasteride for Hair Loss: Evidence, Dosing, Safety
-
Oral Finasteride Before and After: Real Case Studies
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Does Topical Finasteride Work?
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 Michael Williams, PhDNov 12, 2025Finasteride and Dry Eye Disease: Is There A Connection?
Finasteride is a well-established treatment for hair loss, but some reports suggest it may contribute to dry eye disease. This article examines how finasteride’s hormonal effects may impact tear production, reviews current research findings, and provides practical steps for managing or preventing ey...
By Perfect Hair Health TeamNov 11, 20255 Ways to Prevent Hair Loss While Taking Testosterone
Testosterone replacement therapy can transform energy, mood, and libido, but it often comes with an unwelcome side effect: accelerated hair loss. This guide breaks down the science of how TRT ramps up DHT and outlines five evidence-based strategies to protect your hair without sacrificing hormonal b...
By Perfect Hair Health TeamNov 11, 2025Best Topical Dutasteride: 8 Choices for 2025
Topical dutasteride is emerging as a powerful next-generation option for treating hair loss. This expert-reviewed guide ranks the 8 best topical dutasteride treatments, comparing strength, safety, and customization, to help you find the most effective DHT-blocking solution for your needs. From Ulo’s...
By Perfect Hair Health TeamNov 10, 2025Best Topical Finasteride: 5 Top Products of 2025
Topical finasteride is exploding in popularity, but not all formulas are created equal. This guide breaks down the 5 best topical finasteride treatments on the market, comparing strength, safety, customization, and real-world value. From ultra-tailored prescriptions like Ulo to big telehealth brands...
By Sarah King, PhDNov 8, 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 Perfect Hair Health TeamNov 8, 2025Parts of the Scalp: A Guide to the Anatomy, Mechanics, and New Treatment Possibilities
This article takes a detailed tour of scalp anatomy – the regions of the scalp, the muscles, the arteries, the nerves, and the scalp layers. Then we’ll explore the evidence supporting a possible connection between relaxed muscles, scalp mechanics, and hair growth.
By Perfect Hair Health TeamNov 8, 2025Hims vs Keeps vs Roman: Which Hair Growth Subscription Service Wins?
Hair growth subscription services are sprouting up everywhere online. Among them, three companies have emerged from the pack: Hims, Keeps, and Roman. Each company offers two FDA-approved hair loss treatments, as well as other add-on products (supplements, gummies, etc). In this post, the Perfect Hai...
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 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, 2025Microneedling For Hair Loss: What’s The Best Needle Size?
When it comes to microneedling for hair regrowth, researchers aren’t yet sure which needle size elicits the best results. In clinical studies, needle lengths of 0.6mm to 2.5mm (used once weekly or bi-weekly) have been shown to improve hair counts in men with androgenic alopecia (AGA). Even sti...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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