If you've read why Dr. Williams says biotin can't reach your follicles on a GLP-1 — this is the protocol she now recommends to fix it.
Dr. Williams' Gut-First Recovery Formula — Built for Women on GLP-1 Medications
10,000+ reviews from women on GLP-1
You came here for one reason: your hair started shedding 3 to 4 months into your GLP-1 medication, and the standard advice — biotin, more vitamins, "wait it out" — has not worked.
Dr. Sarah Williams, MD, OB-GYN at Williams Women's Health Group, has been writing publicly that this advice cannot work — because GLP-1 collapses the gut bacteria your body uses to absorb biotin, iron, zinc, and the building blocks your hair follicles need.
Herflow is the formula she built around the mechanism. Two prebiotic fibers. Four probiotic strains. No biotin. Two capsules a day. 90-day money-back guarantee — used bottle, full refund.
Inside the recovery window (months 3–9 of your medication), this is reversible. Past month 12, it gets harder. Past month 18, some follicles may not return.
Designed for women on GLP-1
Rebuilds hair from the gut up
2 capsules a day — no scoops
The protocol Dr. Williams recommends
Three steps. One bottle. Inside the recovery window — this is reversible.
Restore the gut
GLP-1 medication suppresses appetite, which starves the bacteria in your large intestine. Four probiotic strains (L. acidophilus, L. rhamnosus, L. reuteri, L. fermentum) — totaling 10B CFU/day — reseed what's been depleted.
4 strains · 10B CFUFeed the follicle
Once absorption is restored, two prebiotic fibers (XOS at 800 mg/day, resistant dextrin at 500 mg/day) feed the bacteria — and the biotin, iron, zinc, and protein your follicles need can finally reach them.
XOS 800mg · Resistant Dextrin 500mgHold for 90 days
Most patients see noticeable shedding reduction in 4–6 weeks and visible regrowth at the part and hairline by month 3–4. Microbiomes do not rebuild in two weeks. Two to three months is the floor.
2 capsules · daily · no biotin
"The women I see in my practice who recover their hair on GLP-1 medications all do one thing first: they fix the gut. Biotin cannot reach a follicle when the bacteria that absorb it have collapsed. Herflow is the protocol I now recommend to start that recovery."
Dr. Sarah Williams, MD
OB-GYN · Williams Women's Health GroupHerflow Hair Strength-3
Dr. Sarah Williams' 3-step protocol — built for women on GLP-1 medication. Restore the gut your hair depends on, in 90 days or every dollar back.
Supplement facts
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How Dr. Williams' 3-step protocol works
Most hair vitamins fail on a GLP-1 because they pile more biotin onto a gut that can no longer absorb it.
Dr. Williams' protocol does it in the right order: 1. A 4-strain probiotic blend (L. acidophilus, rhamnosus, reuteri, fermentum) rebuilds the gut bacteria your medication depleted. 2. Two prebiotic fibers (XOS 400mg + Resistant Dextrin 250mg) feed those bacteria and the follicle. 3. You stay on it for 90 days — the full hair-recovery cycle. Two capsules a day. No biotin, no horse pills, no nausea on top of the medication.
Why biotin and Nutrafol fail on a GLP-1
On a GLP-1, your appetite drops. Less food means less fiber. Less fiber means the gut bacteria your body uses to absorb biotin, iron, zinc, and B-vitamins literally shrink. So when you swallow a biotin pill, the bacteria that were supposed to absorb it aren't there anymore. The pill goes in, the pill comes out, your hair never sees it.
It's like pouring water into a pipe with holes in it. The biotin isn't broken. The pipe is. Until you fix the pipe — your gut absorption — no hair vitamin can do its job. That's the part Dr. Williams designed Herflow to address first.
What happens if I keep waiting?
Hair recovery has a window. Inside it, recovery is fastest. Past it, harder.
Months 3 to 9 of your GLP-1 are the most leverage you have — follicles are tired but still active, and the protocol can wake them up in 60–90 days. Past month 12, follicles begin entering longer dormancy. For Black women, dormant follicles can begin to scar (CCCA) — and once they scar, no supplement brings them back (per the Black Women's Health Study + JAAD 2025).
Dr. Williams' bottom line to her patients: “The cost of acting now is one bottle. The cost of waiting another nine months can be follicles you don't get back.”
Will it interact with my GLP-1 medication?
No. Two prebiotic fibers + four probiotic strains — same family of ingredients as in food. Hormone-neutral, vegan, food-derived. No actives that interact with GLP-1 medications.
Dr. Williams tells her patients to take it alongside their medication, not instead. Always tell your prescribing physician what you're adding — but interaction-wise, this formula is clean.
Will it break me out like biotin did?
No added biotin in the formula. High-dose biotin is the #1 cause of cystic jawline acne in this category — and the women who tried biotin and broke out are exactly the ones Dr. Williams designed Herflow to skip biotin for.
Most women report skin improves on the protocol because balanced gut bacteria reduce systemic inflammation.
Tested on Type 4 / works under my install?
Yes — and you don't have to take down your install for it to work.
The mechanism works at the follicle, which is the same on every hair type. The work is happening underneath, where the hair is being made. Type-4 friendly. Edges-friendly. Crown-friendly.
How fast will I actually see results?
Week 3: less shedding — your shower drain, brush, and pillow start looking normal again.
Month 2: baby hairs appear at the part and along the hairline. The first sign of new growth.
Day 90: visibly fuller density. Your hairdresser will likely notice before you do.
This is real recovery — not a 30-day miracle. Anyone selling you a 30-day fix on a GLP-1 is selling you something that mechanically can't work.
Discreet shipping
Plain unmarked outer mailer — no Herflow branding, no medical wording, nothing visible from the outside. Ships within 1 business day from the US. Free shipping on every subscription order. Tracking emailed once it leaves the warehouse.
Most of Dr. Williams' patients prefer to keep both their GLP-1 medication and their hair-recovery protocol private — including from family who don't need a daily reminder. Your name is on the mailer; the brand stays inside the pouch.
90-day money-back guarantee
Use the entire pouch. If your hair hasn't responded in 90 days, email us — every dollar back. Including shipping.
No return shipping required. No restocking fee. No “unopened only” loophole. No phone calls. No retention scripts. One-click cancel on the subscription.
Most hair supplements demand an unopened bottle within 30 days — shorter than the gut microbiome takes to rebuild. Dr. Williams insisted on a real guarantee: one long enough to test the protocol for the full 60–90 day hair-recovery cycle she explains to every patient in her office. The 90-day window is part of why she felt comfortable putting her name on it.
Email support@tryherflow.com when you decide.
Reviewed & formulated by
Dr. Sarah Williams
MD · OB-GYN · Williams Women's Health Group
Why Dr. Williams’ protocol actually works
Most supplements can’t help because they ignore the real problem. Dr. Sarah Williams designed Herflow specifically for women on GLP-1 medication — restoring the gut absorption your hair depends on, in the exact order it needs.
Taking more vitamins into a compromised gut is like pouring water into a broken pipe. Dr. Williams’ protocol starts by restoring your gut with a 4-strain probiotic blend plus prebiotic XOS — the step most supplements skip entirely.
GLP-1 medication slows digestion and changes how your gut absorbs nutrients. That is the exact gap Herflow was built to close — not by adding more vitamins on top, but by rebuilding the foundation underneath.
Once your gut microbiome is functioning again, nutrients can reach your hair follicles the way they are supposed to. That is why biotin alone never worked — your body could not absorb it. Herflow fixes the absorption problem first.
With consistent daily use, many women notice less hair in the drain within the first few weeks. By 8 to 12 weeks, edges and crown areas often show visible improvement — the kind your hairdresser notices before you do.
Two capsules a day. That is all it takes. The women who see the best results are the ones who keep it simple and stay consistent. No complicated routine, no extra steps — just a daily capsule that works alongside your medication.
From Shedding to New Growth
Real women on Dr. Williams' protocol. No filters. No edits.
Herflow Capsules vs The Usual Options
Most hair supplements assume your gut is absorbing them. On a GLP-1, that assumption is wrong. Dr. Williams designed Herflow around the mechanism — not against it.
Herflow
Others
What women told us in our survey
Real feedback from women on Dr. Williams’ protocol — designed to rebuild the gut foundation your hair depends on.
reported noticeably less hair shedding within the first 60 days.
In a post-purchase survey, customers shared they noticed less hair in the shower drain, on their pillow, and in their brush — especially those on GLP-1 medication.
reported feeling more confident about their hair again.
Many said they stopped avoiding mirrors and started feeling like themselves again — with visible new growth along the hairline and part.
said the daily routine was easy to stick with — just 2 capsules a day.
Customers said the capsules were gentle on the stomach, easy to remember, and became a simple part of their morning routine.
Backed by Science: View Ingredients
Supplement facts
In our survey, 9 out of 10 women on GLP-1 medication said hair loss was their biggest unexpected side effect. Dr. Williams designed Herflow Hair Strength to address the root cause — starting with the gut.
Used to support: Gut Balance, Nutrient Absorption & Hair Growth
A targeted blend of four Lactobacillus strains (L. acidophilus, L. rhamnosus, L. reuteri, L. fermentum) that supports gut balance — a key foundation for hormone regulation, nutrient absorption, and healthy hair growth. A healthy gut means your body can actually deliver what your hair follicles need to recover and grow.
50 mg (5 Billion CFUs) per serving
Used to support: Feeds Good Gut Bacteria & Hair Health
A powerful prebiotic that feeds good gut bacteria and helps create the optimal internal environment for hair health. XOS works hand-in-hand with the probiotic blend to strengthen your gut microbiome — so the foundation for hair growth is fully supported.
400 mg per serving
Used to support: Digestive Health & Nutrient Uptake
Supports digestive health and nutrient uptake, so your body can better use the ingredients that fuel hair growth. Resistant dextrin helps ensure that everything you take in is properly absorbed — making every capsule count.
250 mg per serving
Frequently Asked Questions
Take 2 capsules daily with water, preferably with a meal. Consistency is key — take them at the same time each day for best results.
Dr. Sarah Williams designed Herflow as a 3-step protocol: restore gut balance with a 4-strain probiotic blend, feed the follicle with prebiotic XOS and resistant dextrin, then hold steady for the full 90-day hair cycle. Instead of adding more vitamins, it fixes the foundation most supplements miss.
Most women notice less shedding within 30 days. Visible new growth and stronger hair typically develop over 60–90 days of consistent daily use. Hair growth takes time — the capsules support the process every day.
Yes. Herflow Hair Strength was specifically designed for women experiencing hair loss as a side effect of GLP-1 medication. The ingredients are gentle, natural, and safe to use alongside your treatment. Always consult your doctor if you have specific concerns.
Most hair supplements just add biotin or vitamins on top of a system that cannot absorb them properly. Herflow takes a different approach — it rebuilds your gut environment first, so your body can actually use the nutrients that fuel hair growth. That is why women on GLP-1 medication see real results.
Yes, we offer a 100% satisfaction 90-day money-back guarantee. If you are not happy with your results, contact us at support@tryherflow.com for a full refund.
Yes, you can subscribe and save for convenient automatic deliveries. You can cancel, pause, or adjust your subscription anytime — no commitments.