The 21-Day Hair Challenge is on — thicker hair starting in 3 weeks* · Founder pricing while supplies last
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4.5/5 · Powered by Lustriva® + Serevelle™
Thicker hair — for less than half the price.
Women are switching to the only formula with two patented ingredients — including a clinically studied 'anti-shed' saw palmetto — clinically studied for thicker, denser hair in as little as 3 weeks. As low as $1.10 a day.*
Start the 21-Day Challenge (from $33/bottle)
Clinically studied
GMP certified · Made in USA
60-day money-back guarantee
3 reasons women are switching to Growth+
If you tried biotin and saw nothing, here's what's actually different — and why it costs less than the brand everyone names first.
01
Two patented ingredients
Not just biotin. Two clinically studied patented ingredients.
Most hair supplements are just biotin your body barely absorbs. Growth+ pairs Lustriva® — a form of biotin that's 40× more soluble than regular biotin* — with Serevelle™, a patented saw palmetto extract that supports a healthy hair follicle environment.*
It's called Dual-Pathway Technology™: one ingredient supports the strand, the other supports the follicle. No competitor in the category holds both.
The only formula combining Lustriva® + Serevelle™ — the two-pathway approach basic biotin can't match.*
02
Results you can see fast
Thicker hair starting in as little as 3 weeks.*
That's the whole idea behind the 21-Day Challenge: take it every day, watch the shower drain and your ponytail, and see the first shift for yourself. In the Lustriva® clinical study, a visible change showed up early.*
Real people describe it the same way — less shedding first, then more body at the root. Growth from the root means thicker, not longer.
Day 1 to Day 21 — the return-and-see-for-yourself window that makes this a challenge, not a maybe.
02
Results you can see fast
Thicker hair starting in as little as 3 weeks.*
That's the whole idea behind the 21-Day Challenge: take it every day, watch the shower drain and your ponytail, and see the first shift for yourself. In the Lustriva® clinical study, a visible change showed up early.*
Real people describe it the same way — less shedding first, then more body at the root. Growth from the root means thicker, not longer.
Day 1 to Day 21 — the return-and-see-for-yourself window that makes this a challenge, not a maybe.
03
Half the price
Clinically credentialed hair science — as low as $1.10 a day.
The leading hair-wellness brand built a category charging $88 a month — with zero Lustriva® and zero Serevelle™. Growth+ has both, superior clinical data on both, and starts at $33 a bottle on the 6-month plan.
That's as low as $1.10 a day on the 6-month plan for two patented ingredients the $88 brand doesn't include at all.
As low as $33 a bottle vs. $88 — less than half the price, with two patented ingredients instead of none.
Launch Offer
The longer you stay with it, the more you'll notice.
Subscribe & Save on every bottle — the longer your plan, the lower your price. Free shipping on 3- and 6-month plans; cancel anytime. Prefer to buy once? A single bottle is $49.
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Real 21-Day Challenge updates
See it from women on the challenge
Real videos from women documenting their journey with MyBiotin ProClinical Growth+. Individual results may vary.
Videos reflect individual experiences; some contributors received the product free or an incentive. Individual results may vary and are based on consistent daily use. *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
What to expect
Real change, on a real timeline
Change doesn't happen overnight. With consistent daily use, here's the arc many women describe.*
Before
After · 21 Days
"I wasn't a believer until 21 days in — then much less shedding, and more texture and thickness."
Stacey M. · 21-Day Challenge
Photos are Stacey's own and reflect her individual experience; she was compensated. Results are not typical and individual results may vary. Hair styling and lighting differ between the two photos.
Week 3 · First visible shift
Thicker at the root
Thicker-looking hair begins at the root.* Hair may feel stronger, with less visible shedding during brushing or washing.*
Week 6–8 · Building density
Fuller, more body
Hair appears fuller overall with improved body and coverage.* You may notice better styling hold and less breakage.*
Week 12+ · Fuller hair & brows
Density that holds
Continued improvement in density and overall fullness.* Brows may appear fuller-looking, and skin appears smoother and refreshed.*
*Results may vary. Based on consistent daily use.
A more complete approach
Two ingredients. Two pathways. One capsule.
Hair thinning isn’t caused by one thing — so Growth+ uses Dual-Pathway Technology™ to support both the hair strand and the follicle environment.*
Structure support
160
mg
Lustriva® (MB40X™)
A clinically studied biotin complex that's 40× more soluble than regular biotin* — so it actually reaches the strand to help hair look thicker and more resilient.* This is the pathway your old biotin was missing.
Follicle & cycle support
267
mg
Serevelle™ (Saw Palmetto)
A patented saw palmetto extract that supports a healthy hair follicle environment and the natural hair cycle, while helping reduce the appearance of shedding over time.* Clinically studied in both women and men.*
Competitive snapshot
The only formula with both patented ingredients.
Compared head-to-head with the two brands women shop most — at a fraction of the price.
Lustriva® (MB40X™)
Serevelle™ (patented saw palmetto)
Fuller-looking brows*
3-week visible results*
30-Day price
MyBiotin Growth+
$$
Popular $66 brand
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—
$$$
Leading $88 brand
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—
—
—
$$$$
The only formula in the category combining Lustriva® + Serevelle™. Relative pricing shown; competitive comparison verified March 2026.
The only formula in the category combining Lustriva® + Serevelle™. Competitive comparison verified March 2026.
Why the ProClinical upgrade
Two root causes. Most biotin only addresses one.
Hair thinning has two independent drivers. Basic biotin — even great biotin — can only reach one of them. Growth+ was built to support both.*
Root cause 1 · Bioavailability
The strand isn't being fed
Standard biotin is poorly absorbed, so the follicle never gets adequate nutritional support — no matter the dose. Lustriva® (40× more soluble) solves this. It's the pathway every biotin supplement, including standard MyBiotin ProClinical, is built around.*
Root cause 2 · Follicle environment
The follicle needs support too
For many women — especially with hormonal shifts or increased shedding — the follicle environment itself needs support that biotin alone can't provide. Serevelle™ addresses this second pathway. Only Growth+ contains it. That's the ProClinical upgrade: same trusted brand, a second clinically studied pathway.*
The Purity Promise
More than basic biotin — backed by 33 years
Growth+ was created for women who need more than basic biotin, combining clinically studied ingredients in one advanced formula designed for visible results.* When your hair looks fuller and stronger, you feel more like yourself again.
Manufactured in GMP-certified facilities
Lab tested for quality and purity
Backed by a 60-day money-back guarantee
Built on published clinical studies — not hype
33
Years of innovation & wellness
60
Day money-back guarantee
2
Patented ingredients
3 weeks*
First visible shift
Questions? We've got answers
Frequently asked
My doctor said my hair thinning is hormonal — can this help?
Hormonal shifts change the environment your follicles live in, which is why biotin alone often isn't enough. Growth+ adds Serevelle™ to support that follicle environment and is clinically studied for women experiencing hormonal hair changes, with published 180-day data including a subgroup of women going through menopause.* It's a daily supplement, not a treatment for any medical condition — but it's formulated for exactly this kind of change.
How soon will I see results?
Growth+ is formulated with clinically studied ingredients for thicker hair in as little as 3 weeks.* Many women notice less shedding and fuller-looking strands early, with continued improvement over time.* That's the idea behind the 21-Day Challenge.
What makes it different from regular biotin?
Most biotin isn't well absorbed. Growth+ uses Lustriva® — a form that's 40× more soluble — plus Serevelle™, a clinically studied saw palmetto extract. Together they support both nutrient delivery to the strand and a healthy follicle environment for visibly thicker hair.*
How is this different from the leading hair-wellness brand?
Growth+ is the only formula combining both Lustriva® and Serevelle™, and it's backed by published 180-day data with a menopausal subgroup — clinical depth most competitors don't have. All for about half the price of the leading $88 brand.*
Can it help with shedding and thinning?
Yes — Growth+ is formulated with clinically studied ingredients to support less shedding and thicker, denser-looking hair. It works by supporting the natural hair growth cycle and follicle health so hair appears fuller over time.*
What quality measures do you take?
Made in a GMP-certified facility, non-GMO, gluten-free, made in the USA. Both Lustriva® and Serevelle™ are patented, clinically studied, with peer-reviewed published data, backed by 33 years of Purity Products clinical innovation.*
Is this just for women, or can men use it too?
Men can use it too. Growth+ was designed with women's hair concerns in mind, but Serevelle™ has been clinically studied in men as well — so it supports the appearance of thicker, fuller-looking hair (not longer hair) for both.*
How does the guarantee work?
Every order is backed by a 60-day money-back guarantee. If Growth+ isn't the right fit, request a refund within 60 days. Subscribe & Save is optional, off by default, and you can cancel anytime — no phone calls.
Take the 21-Day Challenge
Thicker hair starting in 3 weeks* — as low as $1.10 a day.
Two patented ingredients. Less than half the price of the leading $88 hair-wellness brand.* A 60-day guarantee that takes the risk off you. Start today and watch your Day 1 to Day 21.
Choose your supply from $33/bottle
“I wasn’t a believer until 21 days in — then I noticed much less shedding in the shower, and more texture and thickness day to day.”
Stacey M. · 21-Day Challenge
"My hair feels fuller, especially around my temples and part line, and I'm seeing less shedding overall. This has become part of my daily routine."
Megan L. · Verified Reviewer
“Without volumizer, without anything else, my hair is fuller — it’s made a big difference.”
Kyra R. · 21-Day Challenge
© 2026 Purity Products®. Lustriva® is a registered trademark of Nutrition21, LLC. Serevelle™ is used under license. MyBiotin® is a registered trademark of Purity Products.