- 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.
-
Does Retinoic Acid (Tretinoin) Improve Hair Growth From Minoxidil?
-
Topical Cetirizine: An Anti-Histamine That Regrows Hair? (New Evidence)
-
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
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, PhDMay 5, 2025Does Retinoic Acid (Tretinoin) Improve Hair Growth From Minoxidil?
Retinoic acid, a biologically active form of vitamin A, has long been known for its role in skin health, but could it also help with hair loss? In this article, we explore the science behind retinoic acid and its derivative tretinoin, their effects on hair follicle stem cells, and whether clinical s...
By Ben Fletcher, PhDApr 29, 2025Topical Cetirizine: An Anti-Histamine That Regrows Hair? (New Evidence)
Curious if an allergy medication could help with hair loss? Cetirizine, a second-generation antihistamine, is best known for treating allergies, but emerging research suggests it might also promote hair growth when applied topically. From reducing inflammation and mast cell activity to lowering leve...
By Sarah King, PhDMar 11, 2025Can Methylene Blue Regrow Your Hair? A Look At The Science.
Methylene blue, a well-known compound with antioxidant and anti-aging properties, has recently gained attention as a potential hair loss treatment. But does the science support the hype? In this article, we examine preclinical research on methylene blue, its mechanisms related to hair health, and wh...
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 Sarah King, PhDJan 17, 2025New Study: Does Finasteride Cause Birth Defects?
A recent study has raised concerns about paternal finasteride use and cryptorchidism (undescended testicles) in offspring, but does the data actually support a causal link? The study, based on FAERS reports, shows a statistical association—but not proof of risk. Issues like reporting bias, lack of a...
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.
- Mission Statement
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