- 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.
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Minoxidil Before and After Photos [2026] | Does It Work?
-
Musely Reviews for Hair Loss: Are They Trustworthy?
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Oral Finasteride Before and After: Real Case Studies
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Why Am I Shedding After Starting Ketoconazole?
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Diffuse Thinning: Causes, Implications, And Steps For Regrowth (See Photos)
-
The Scalp Tension Theory Of Hair Loss: A Scientific Breakdown
-
GHK-Cu for Hair Growth: Does It Actually Work?
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Hims Hair Growth Reviews: The Pros, Cons, and Real Results
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, PhDApr 25, 2024Zinc Supplements For Hair Loss: A Hard Look Into The Science
Zinc is a popular trace element found in hair growth supplements. Animal studies suggest that zinc is required for healthy hair cycling. Human studies suggest that zinc deficiencies can cause hair loss from telogen effluvium. One study found that zinc sulfate might help with non-descript hair loss i...
By Perfect Hair Health TeamOct 30, 2026Diffuse Thinning: Causes, Implications, And Steps For Regrowth (See Photos)
Diffuse thinning is a presentation of hair loss linked to androgenic alopecia, stress, and a variety of chronic conditions. If you’re dealing with diffuse hair loss, this article reveals its common causes, and a step-by-step guide toward identifying which causes are most relevant to you. The g...
By Dr. Michael WilliamsOct 27, 2026Hims Hair Growth Reviews: The Pros, Cons, and Real Results
Hims has quickly become one of the most recognizable telehealth brands for men’s health, and its hair loss lineup is no exception. But do the sleek branding and promises of “personalized” care translate into real, sustainable regrowth? In this in-depth review, we break down Hims’ most popular hair g...
By Catherine Kennedy, PhDOct 27, 2026Keeps Review: The Truth About Their Hair Loss Treatments?
Keeps is a telehealth brand offering science-backed hair loss treatments. In this review article, we’ll break down what Keeps offers, the real science behind offerings such as finasteride and minoxidil, and if the evidence aligns with (or contradicts) any marketing claims....
By Cassie Hopton, PhDOct 27, 202610 Best DHT-Blocking Shampoos
DHT-blocking shampoos are widely available, but do they actually work? While blocking DHT is a proven strategy for treating androgenic alopecia, most evidence comes from oral medications and leave-on topicals, not rinse-off shampoos. In this article, we separate science from marketing by breaking do...
By Perfect Hair Health TeamOct 27, 2026Topical Finasteride: The Best Dosage for Maximizing Regrowth and Minimizing Side Effects
Since earning FDA approval in 1997, Finasteride has been one of the most widely used hair loss drugs. To avoid potential sexual side effects, many opt for topical finasteride in hopes of isolating the drug’s DHT-reducing effects on the scalp. However, at certain doses, topical finasteride can enter ...
By Dr. Michael WilliamsOct 21, 2026Natural vs. Pharmaceutical DHT Blockers: Ranked
Natural and pharmaceutical DHT blockers both aim to slow or reverse hair loss, but their strength, safety, and side effects vary widely. This article ranks the most common DHT inhibitors from weakest to strongest, comparing how natural compounds, such as pumpkin seed oil and EGCG, stack up against p...
By Dr. Michael WilliamsOct 8, 2026Happy Head Review: 5 Concerns With The Brand
Is Happy Head’s personalized hair-loss approach as science-backed as it sounds? In this in-depth review, we break down five key concerns with the telehealth brand’s products and claims. While prescription treatments like minoxidil, finasteride, and dutasteride can be effective, how they’re delivered...
By Cassie Hopton, PhDJun 19, 2026Does Wegovy Cause Hair Loss?
GLP-1 medications like Ozempic and Wegovy are transforming weight loss and diabetes care, but increasing reports of hair loss have raised concerns. Are these treatments really causing shedding, or is something else at play? In this article, we examine the current evidence, explore the possible mecha...
By Sophie Grice, PhDMay 23, 202610 Best Shampoos for Thinning Hair Men
If you’re looking into products for thinning hair, shampoos are often one of the first options to consider. They’re quick, convenient, and easy to add into a routine. But a lot of these products rely on heavy marketing, and only a handful of ingredients actually have clinical evidence behind them in...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