Research
The Regrowth Briefing
Comparisons, explainers and first-hand perspective — written by Scott Blaine Hoffman.
Hair
Guide · Nov 11, 2026
Ozempic Hair Loss: Why It Happens, How Long It Lasts and What Helps
Why Ozempic and other GLP-1 drugs can trigger hair shedding, how long it lasts and what helps your hair recover, from a 30-year hair loss expert.
Hair
Guide · Nov 10, 2026
Exosomes for Hair Loss: Promising Science, Unproven Treatment
Exosomes are the newest "regenerative" treatment being sold to people losing their hair, often at prices that rival a small hair transplant. The pitch sounds scientific, the before-and-after photos look good, and the clinics offering it are often polished. But the evidence, and the legal status, are not what the market
Hair
Guide · Nov 10, 2026
Topical Finasteride: Approval Status, Results and Real Risks
Topical finasteride is one of the most requested treatments in hair loss right now, mostly from men who want finasteride's benefits with less risk of its side effects. The idea is simple: put the drug where the problem is, on the scalp, instead of swallowing it. The reality depends a lot on where you live and what you'
Hair
Guide · Nov 10, 2026
Finasteride vs Dutasteride for Hair Loss: How They Compare
Finasteride and dutasteride both work by lowering DHT, the hormone that shrinks genetically sensitive hair follicles in pattern hair loss. Dutasteride is the stronger of the two, and it's increasingly prescribed off-label. Here's how they compare, in question-and-answer form. How are they different? Both block 5-alpha
Hair
Guide · Nov 10, 2026
FUE vs FUT: 5 Myths Patients Believe
FUE versus FUT is probably the most argued-about topic in hair restoration, and most of the arguing is based on a few myths. Here are the ones I hear most often from patients, and what's actually true. First, the basics FUT (follicular unit transplantation, also called strip surgery) removes a thin strip of scalp from
Hair
Guide · Nov 10, 2026
How to Spot Hair-Loss Shills, Fake Reviews and Paid Promotion
When I ran the Regrowth.com newsgroup, one of the moderators' main jobs was spotting shills: people posing as ordinary hair-loss sufferers while quietly selling a product. Back then a shill was usually one person with a few fake usernames. Today it's an industry. Affiliate programs, paid "UGC" creators, review farms an
Hair
Guide · Nov 10, 2026
Regrowth.com: The First Hair-Loss Network on the Web, and What It Taught Us
Before Facebook groups, before Reddit, before anyone had heard the word "influencer," people losing their hair had almost nowhere to talk to each other. They had a doctor's office, if they were lucky, and a drugstore shelf full of promises. Regrowth.com was built to change that. It was one of the first hair-loss networ
Hair
Guide · Nov 10, 2026
Choosing a Hair Transplant Surgeon: Questions to Ask and Red Flags to Avoid
A hair transplant is permanent, your donor hair is limited, and the results depend almost entirely on who is doing the work. Yet many people choose a clinic based on a price quote, a before-and-after reel or a travel package. Before you book anything, here are the checks worth doing at home, the questions worth asking
Hair
Guide · Nov 10, 2026
Thyroid Hair Loss: Signs, Testing and How to Regrow Your Hair
Thyroid hair loss is usually reversible. Learn the signs, which blood tests to ask for, and how long regrowth takes after treatment.
Hair
Guide · Nov 9, 2026
PCOS Hair Loss: Causes, Treatments and What Actually Helps
PCOS hair loss explained by a 30-year hair loss expert: why androgens thin your hair, how it's diagnosed, and treatments that actually help.
Hair
Guide · Nov 8, 2026
PRP vs Microneedling for Hair Loss: Which Works Better?
PRP vs microneedling for hair loss: what studies show, costs, downtime, who each suits, and why PRP results vary so much between clinics.
Hair
Guide · Nov 8, 2026
Norwood Scale: The 7 Stages of Male Hair Loss and What Each Means for Treatment
The Norwood scale explained: what each of the 7 stages of male pattern hair loss looks like, how to find yours, and what it means for treatment options.
Hair
Guide · Nov 7, 2026
Hair Loss in Your 20s: Causes, Early Signs and What to Do Now
Losing hair in your 20s? Learn the main causes, early warning signs, evidence-based treatments and a 90-day plan from hair loss expert Scott Hoffman.
Hair
Guide · Nov 6, 2026
New Hair Loss Treatments: What's Approved, What's Close and What's Hype
New hair loss treatments explained: JAK inhibitors, clascoterone, PP405 and exosomes. What's approved, what's in trials and what to do today.
Hair
Guide · Nov 5, 2026
Iron Deficiency Hair Loss: Ferritin, Regrowth Timeline and What Helps
Can low iron cause hair loss? Learn how ferritin affects shedding, which blood tests to ask for and how long regrowth takes once iron is corrected.
Hair
Guide · Nov 4, 2026
Regrow Hairline: What Can Actually Bring Your Hairline Back
Can you regrow a receding hairline? Hair loss expert Scott Blaine Hoffman covers causes, treatments that help, and how to track real progress.
Hair
Guide · Nov 3, 2026
Hair Loss After COVID: Why It Happens, How Long It Lasts and What Helps
Hair loss after COVID is usually telogen effluvium. See why it happens, how long shedding lasts, what helps regrowth and when to see a dermatologist.
Hair
Perspective · Nov 2, 2026
What 30 Years in Hair Loss Taught Me About Regrowth
From Usenet threads in the '90s to oral minoxidil today — a first-hand account of what actually changed, and what didn't.
Hair
Guide · Nov 2, 2026
Vitamin D and Hair Loss: What the Research Shows and What to Do
Can low vitamin D cause hair loss? What studies show, which hair loss types are linked, how to get tested, and what to do next.
Hair
Guide · Nov 2, 2026
Your Donor Hair Is Finite: How to Plan a Hair Transplant for a Lifetime of Hair Loss
After more than 30 years of referring patients to hair transplant surgeons, I can tell you the single idea that separates a great long-term result from a disappointing one: your donor hair is a limited budget, and hair loss keeps going after surgery. The best plans are built around both of those facts. The ones that go
Hair
Guide · Nov 1, 2026
Telogen Effluvium Recovery: Timeline, Signs of Regrowth and What Helps
How long telogen effluvium recovery takes, signs your hair is growing back, and what helps, from 30+ years in hair loss.
Hair
Guide · Nov 1, 2026
Hair Regrowth Serum: What Actually Works and How to Choose One
Which hair regrowth serum ingredients have real evidence? Minoxidil, rosemary, caffeine and peptides compared, plus how to read a label.
Hair
Guide · Oct 31, 2026
Postpartum Hair Loss: When It Starts, How Long It Lasts and What Helps
Postpartum hair loss explained: when shedding starts, how long it lasts, what helps, and when to see a dermatologist. From 30+ years in hair loss.
Hair
Guide · Oct 31, 2026
Hair Cloning: Where the Science Really Stands and What to Do Now
Is hair cloning available yet? A 30-year hair loss expert explains the research, why it's so hard, how to spot scams, and what to do while you wait.
Hair
Guide · Oct 30, 2026
Hair Regrowth Products: What Works, What's Hype, and How to Choose
Which hair regrowth products have real evidence? A 30-year hair loss expert ranks minoxidil, lasers, shampoos, oils and supplements, plus red flags.
Hair
Guide · Oct 29, 2026
How to Regrow Hair: What Works, What Doesn't, and Where to Start
How to regrow hair, from hair loss expert Scott Blaine Hoffman: find the cause, use proven treatments, set a realistic timeline, and know what to skip.
Hair
Guide · Oct 28, 2026
Hair Regrowth for Women: Causes, Proven Treatments & Timeline
Learn what causes thinning hair in women, which treatments have real evidence, and how long hair regrowth for women really takes. Expert guide.
Longevity Drugs
Comparison · Oct 21, 2026
Rapamycin vs. Metformin: Comparing Two Longevity Drug Candidates
Mechanism, evidence grade, cost and side effects, side by side — and where each one's data actually stands.
Testing
Explainer · Oct 8, 2026
ApoB, Explained: The One Cholesterol Number That Matters Most
Why many preventive cardiologists now prefer ApoB over LDL-C — and how often to test it.