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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.

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Nutrafol Growth Activator Hair Serum: A Scientific Analysis & Debunking
By Sarah King, PhD
Mar 29, 2024

Nutrafol 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...
Are Low-Potency Corticosteroids Safe for Use as Hair Loss Treatments?
By Perfect Hair Health Team
Mar 29, 2024

Are Low-Potency Corticosteroids Safe for Use as Hair Loss Treatments?

Many telehealth brands are adding in low-potency corticosteroids – i.e., 1% hydrocortisone or 0.01% fluocinolone – to their prescription topicals for hair regrowth. They also recommend men & women use their topicals twice-daily, forever. The problem? Corticosteroids can thin the skin, and there&...
What Happens If I Stop Using Finasteride?
By Perfect Hair Health Team
Feb 26, 2024

What 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...
Topical Finasteride: How Can I Minimize My Partner’s Exposure To The Drug?
By Perfect Hair Health Team
Feb 26, 2024

Topical Finasteride: How Can I Minimize My Partner’s Exposure To The Drug?

Some topical finasteride users worry about inadvertently exposing their partner or kids to the drug – particularly if household members often touch their hair or use the same pillowcases. In most scenarios, indirect exposure to topical finasteride is not a cause for concern – particularly if users g...
Understanding Evidence Quality | How Hair Loss Companies Cheat Clinical Trials
By Perfect Hair Health Team
Sep 6, 2023

Understanding Evidence Quality | How Hair Loss Companies Cheat Clinical Trials

In this guide, we’ll expose how big-brand companies in the hair loss industry cheat their clinical study results – all so they can convince hair loss sufferers to buy products that probably won’t work for them. Due to a broad definition of “hair loss” and “hair growth&#...
Fluridil: A Topical That Regrows Hair, Without Side Effects? (Scientific Deep-Dive)
By Sarah King, PhD
Mar 6, 2023

Fluridil: A Topical That Regrows Hair, Without Side Effects? (Scientific Deep-Dive)

Fluridil (topilutamide) is a topical anti-androgen that may help reduce levels of testosterone and dihydrotestosterone in the scalp. Some users claim the drug regrows hair, doesn’t cause side effects, and doesn’t affect hormones elsewhere in the body. But is this actually true? To date, ...
Regrowth from Minoxidil: How Much Should I Expect?
By Perfect Hair Health Team
Feb 24, 2023

Regrowth from Minoxidil: How Much Should I Expect?

How much regrowth can we expect from minoxidil? As with any hair loss treatment, it depends on a number of factors: genetic variance in the SULT1A1 gene, the delivery method of minoxidil (oral vs. topical), the dosing amount and schedule, and if minoxidil is combined with interventions that might en...
How Does Minoxidil Work? 3 Hypotheses + Debates
By Perfect Hair Health Team
Feb 23, 2023

How Does Minoxidil Work? 3 Hypotheses + Debates

Despite decades of study and FDA approval, researchers still aren’t sure exactly how minoxidil regrows hair. Over the last few years, investigators have explored a number of hypothetical mechanisms ranging from vasodilation to prostaglandin modulation to anti-androgenic effects. In this articl...
How Often Do I Need To Apply Topical Finasteride?
By Perfect Hair Health Team
Feb 23, 2023

How Often Do I Need To Apply Topical Finasteride?

Is a single daily topical finasteride application enough to significantly reduce DHT levels and regrow hair? It depends on the dilution of topical finasteride, the application volume (in mL), the carrier ingredients, how long that topical finasteride is left on the scalp prior to washing it out, and...
How Often Do I Need To Take Oral Finasteride?
By Perfect Hair Health Team
Feb 22, 2023

How Often Do I Need To Take Oral Finasteride?

Oral finasteride is prescribed at 1 mg daily to treat androgenic alopecia (AGA). However, clinical studies suggest that doses as low as 0.2 mg daily can reduce levels of dihydrotestosterone (DHT) nearly the same as 1.0 mg daily doses, and improve hair counts similarly to 1 mg daily. But do these low...

Stop guessing which hair loss
treatments actually work

Instead, 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.