- 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.
-
Keeps Review: The Truth About Their Hair Loss Treatments?
-
7 Best Oils for Hair Growth
-
Hims Hair Growth Reviews: The Pros, Cons, and Real Results
-
How to Get Finasteride: Is It Over the Counter?
-
Topical Finasteride Before and After: Real Case Studies
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How to Reduce the Risk of Finasteride Side Effects
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10 Best DHT-Blocking Shampoos
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Best Minoxidil for Men: Top Picks for 2026
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, PhDSep 18, 2024Can Progesterone Improve Hair Regrowth?
Progesterone is a hormone that plays a vital role in female reproductive health. Deficiencies in progesterone have been linked to hair thinning, particularly in conditions like female pattern hair loss (FPHL) and postpartum telogen effluvium (PPTE). While natural progesterone seems to have 5-alpha-r...
By Sarah King, PhDMay 9, 2024HMI-115: What We Know So Far
HMI-115 lowers prolactin levels and is currently in clinical trials for the treatment of androgenic alopecia (AGA). Internal, non-peer-reviewed research suggests that HMI-115 may promote hair regrowth in monkeys. Anecdotes from its phase I trials in humans imply that HMI-115 may also regrow hair in ...
By Sarah King, PhDApr 19, 2024Turmeric (Curcumin) For Hair Regrowth? Big Claims, Limited Data
Petri dish (i.e., in vitro) studies suggest that turmeric and its active constituent, curcumin, might decrease cyclooxygenase-2 (COX-2), inducible nitric oxide synthase (iNOS), and nuclear factor kappa beta (NF-κB). Since these pathways and proteins share pathologic overlap with certain hair loss di...
By Sarah King, PhDApr 11, 2024EGCG: Does This Polyphenol Regrow Hair? | A Scientific Analysis
Epigallocatechin gallate (EGCG) is a popular ingredient found in hair growth supplements, serums, & topicals. Unfortunately, there’s little clinical data showing it can regrow hair in humans, and at higher doses, it might be toxic. On the one hand, in vitro studies suggest EGCG has 5-alpha...
By Sarah King, PhDApr 11, 2024Nourkrin® Review: Can Proteoglycans Actually Reverse Hair Loss?
Nourkrin® markets its supplements as a “natural approach to hair loss”. The company differentiates itself with Marilex®: a “bioactive proteoglycan formula”. Three human studies suggest Nourkrin® products are effective at regrowing hair. Upon further investigation, each study ...
By Sarah King, PhDApr 4, 2024Harklinikken Extract: Uncovering The Real Evidence
Harklinikken Extract is a hair growth serum marketed to men & women with hair loss. Harklinikken keeps secret the full list of ingredients inside Extract. Of the ingredients that are disclosed, there is incredibly limited clinical evidence supporting their use in treating hair loss. Despite this...
By Perfect Hair Health TeamJan 24, 2023Will Finasteride Lower My Libido?
Finasteride is widely regarded as the gold-standard treatment for male pattern hair loss, with 80-90% of men responding favorably to the drug. At the same time, the number one reason people avoid this hair loss medication is the fear of lower libido. Online reports of finasteride’s sexual side effec...
By Perfect Hair Health TeamApr 15, 2022Stinging Nettle For Hair Loss: Real vs. Perceived Benefits
Stinging nettle is a popular natural remedy for hair loss. Unfortunately, quality studies on stinging nettle (and its effects on hair growth) are scarce. Most marketers selling stingle nettle relying almost exclusively on petri dish studies and mouse models to suggest it may have some hair-promoting...
By Perfect Hair Health TeamMar 5, 2022How Long Does a Hair Transplant Last?
Fifty years ago, studies on hair transplants indicated that transplanted hairs never thin. But a 2020 study now suggests that hair transplants can thin… and even just four years post-surgery. What could explain these conflicting results, and what can we make of the new data? This article uncov...
By Perfect Hair Health TeamOct 20, 2020Calcium’s Role In Hair Loss? It’s Complicated.
Calcium imbalances are linked to hair loss, with caveats. Low calcium and hair loss is seen in women with polycystic ovarian syndrome. High calcium and hair loss is reported in people with hyperparathyroidism. But in both cases, the calcium imbalances are consequences of the underlying conditions, n...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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