- 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 Side Effects: What to Know
-
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
-
Oral Dutasteride for Hair Loss: Results, Side Effects, Dosing & How It Compares to Finasteride
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 27, 2025Blueprint Haircare Stack: Product Review
Bryan Johnson’s Blueprint Haircare Stack promises hair longevity rooted in science, but how much does that translate into real-world results? In this review, we unpack the ingredients, scrutinize the evidence, compare it to proven alternatives, and ask whether the Haircare Stack offers meaningful be...
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 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 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 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 TeamDec 3, 2025Best Minoxidil for Women: Top 6 Brands of 2025
With so many hair-thinning treatments marketed to women, it can be difficult to separate what truly works from what’s just hype. This evidence-based guide ranks the best minoxidil options for women in 2025, including prescription and over-the-counter formulas, based on effectiveness, tolerability, c...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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