GLP-1 & your hair
GLP-1 Hair Loss? What Helps, and the 5 Things Women Try, Ranked
On the shot or about to start? What to do first, and how protein, biotin, rosemary oil and minoxidil compare.
- Most hair loss on the shot is shedding all over, from losing weight fast. It usually stops by itself.
- First, eat enough protein. Ask your doctor to check your iron, thyroid and vitamin D.
- Thinning on top is different. A hormone called DHT causes it. Only one of the 5 things below works on DHT.
Most GLP-1 hair loss is shedding all over, from the fast weight loss. It usually stops a few months after your weight levels off.
Until then, eat your protein. Ask your doctor to check iron, thyroid and vitamin D.
If the top keeps thinning, that's a different problem. Number one below is made for that.
Whether you're on the shot or about to start, you hear the same advice: eat more protein, take biotin and wait it out.
Some of that is right. Protein protects your muscle while the weight comes off. And the shedding does stop.
But plenty of women do all of it and still see more scalp on top. That part needs a different kind of help.
Why the top thinsWhat's going on
Losing weight fast can set off shedding all over your head. That usually stops by itself. Thinning on top is a different problem.
Your body makes two hormones that matter for the hair on top. Estrogen is one. Every woman makes it, and one of its jobs is guarding the hair roots.
The other is DHT. Your body makes it from testosterone, which women make a little of too. DHT shrinks the hair roots on top, so each new hair comes in thinner.
The two pull against each other. While estrogen is up, DHT loses. When estrogen drops, DHT wins on top.
On a GLP-1, that happens in three steps.
- 1The shot takes fat fast
That's how the weight comes off so quickly.
- 2Estrogen drops with the fat
Part of your estrogen is made in fat, so less fat means less estrogen.
- 3DHT wins on top
The roots on top shrink, and the back stays thick.
How you got here
The shot worked. The scale finally moved, maybe faster than you hoped.
Then, around month 3 or 4, the brush started filling up. So you did everything you were told.
You counted your protein. You added biotin, maybe collagen in your coffee. Hair kept filling the drain.
All I do is eat protein and I'm still losing hair.
From a Mounjaro thread
None of that is on you. Protein and biotin feed the hair. Neither one does anything about DHT.
Not on the shot yet? Shedding usually starts around month 3. Many women who've been there wish they'd done something sooner.
The checksThe 5 things that matter
The 5 things to look for
Here's what to look for on the back of the bottle.
- Made for women. It says it's for women thinning on top.
- The DHT job. It has pumpkin seed oil and saw palmetto, two plants that help slow DHT. Both amounts are printed.
- Easy to keep up. One or two small pills a day. Nothing to rub in.
- Blood tests. Low biotin and no iodine, so your blood tests stay accurate.
- 12 weeks, fair price. Hair needs about 12 weeks to show a change. That should cost about $60.
We checked every product below on these same five things.
The rankingThe 5 things women try, worst to best
Women on the shot try these most: protein, biotin, rosemary oil and minoxidil, a foam for the scalp. We checked each one on the same five things.
✓ Gets it right · ✕ Problem · ! Okay, not ideal
Premier Protein 30g Protein Shake
The protein shake · 1 a day
Gets 1 of 5 right- Made for Muscle, for anyone
- The DHT job No pumpkin seed oil or saw palmetto
- Easy to keep up A full shake, hard on a small appetite
- Blood tests No big biotin dose
- 12 weeks About $168 at one a day
- Price About $2 a shake
Verdict. Keep drinking it. Protein protects your muscle while the weight comes off. But it does nothing about DHT.
Nature's Bounty Biotin 10,000 mcg
The biotin bottle · 1 softgel a day
Gets 2 of 5 right- Made for Hair, skin and nails, for anyone
- The DHT job Biotin only, nothing for DHT
- Easy to keep up One softgel a day
- Blood tests 10,000 mcg of biotin a day
- 12 weeks Under $12, one bottle covers it
- Price About $9 to $12 a bottle
"I was taking Biotin for a bit but that did nothing"
From a Zepbound threadVerdict. Cheap, and it feeds the hair. But a lot of women say it did nothing for them. This much biotin can throw off a thyroid blood test.
Mielle Rosemary Mint Scalp & Hair Strengthening Oil
The rosemary oil · rubbed into the scalp
Gets 2 of 5 right- Made for Any hair type
- The DHT job No pumpkin seed oil or saw palmetto
- Easy to keep up Rubbed in, no set dose
- Blood tests Nothing you swallow
- 12 weeks Under $30, even at a bottle a month
- Price About $10 a bottle
Verdict. Cheap, and it feels good on a dry scalp. But the label shows no amounts, and it has no pumpkin seed oil or saw palmetto.
Women's Rogaine 5% Minoxidil Foam
The minoxidil foam · once a day on the scalp
Gets 3 of 5 right- Made for Women, thinning on top
- The DHT job Works on the root, not on DHT
- Easy to keep up Foam on your scalp every day
- Blood tests Nothing you swallow
- 12 weeks Under $60 for 4 months
- Price About $11 to $15 a month
"Minoxidil works but you have to use it everyday…"
From a Mounjaro threadVerdict. Cheap, and it helps a lot of women. If you stop, the label says the hair loss begins again. The label also warns about facial hair.
HALO Hair
2 softgels a day
Gets 5 of 5 right- Made for Women losing hair on top
- The DHT job Both plants, both amounts printed
- Easy to keep up Two softgels a day
- Blood tests Biotin 100 mcg, no iodine
- 12 weeks $59.99 for three bottles
- Price $20 a bottle, more than rosemary oil
Verdict. The only one here that gets all five right: 1,000 mg of pumpkin seed oil, 320 mg of saw palmetto and low biotin. On the shot or about to start, give it 12 weeks.
Prices and labels checked September 2026.
Get number one, buy 2 get 1 free →Buy once, or subscribe and save.
Number oneWhat's inside number one, and how it works
Two softgels a day. Here's every amount, straight off the label.
| Ingredient | Per day | What it does |
|---|---|---|
| Pumpkin seed oil, cold-pressed | 1,000 mg | Helps your body make less DHT at the root |
| Saw palmetto extract | 320 mg | Also helps your body make less DHT |
| Zinc | 10 mg | Your body uses it to build new hair |
| Selenium | 55 mcg | Helps keep hair and nails healthy |
| Copper | 1 mg | Helps hair keep its color |
| Vitamin E | 50 mg | Helps protect cells from everyday wear |
| Biotin | 100 mcg | Low on purpose, so your blood tests stay accurate |
| Iodine | None | Left out on purpose |
Estrogen helps guard the roots on top. On the shot, part of it goes with the fat.
At the root, your body has a tiny helper called an enzyme. It turns some of your testosterone into DHT.
DHT is the hormone that makes each new hair on top grow in finer.
Both plants slow that enzyme, right at the root. So less DHT is made there.
Each plant does it in its own way. You don't need a prescription.
Pumpkin seed oil is pressed cold from the seeds, like a good olive oil. Saw palmetto is the berry of a small palm that grows wild in Florida.
There's one trial, and it was in men. They took 400 mg of pumpkin seed oil a day for 24 weeks. Their hair counts went up about 40%.
There's no trial in women yet. Number one has 1,000 mg a day.
It's the only one here with 1,000 mg cold-pressed pumpkin seed oil and 320 mg saw palmetto.
The biotin is kept low, at 100 mcg, and there's no iodine. It's made for women losing hair on top, on the shot or about to start.
See the full label →Now check yours
Already using something? Check the back for the same five things. Not using anything yet? Check the next one you pick up.
- Does it say women, and thinning on top?
- Does it list pumpkin seed oil and saw palmetto, with amounts?
- Is it one or two small pills a day?
- Is the biotin under 1,000 mcg?
- Do 12 weeks of it cost about $60 or less?
Count how many it gets right.
If it gets fewer than five, that's not a mistake you made. You picked it off the same shelf everyone does.
See the one that gets all five →
What number one costs
Buy once, or subscribe and save from $24.99. Free US shipping on 3 or more. 90-day money back.
QuestionsWhat women ask
What should I ask my doctor to test?
Iron, thyroid and vitamin D. Low levels of any of them can thin hair on their own. If you take biotin, tell the lab before they draw blood.
How do I stop the shedding?
It usually stops by itself, 3 to 6 months after your weight levels off. If you're still shedding after 6 to 9 months, see your doctor.
I haven't started the shot yet. Is now a good time to start number one?
Hair takes about 12 weeks to show a change. Start it with your first shot, and by month 3 you'll be 12 weeks in. That's when shedding usually starts.
Can I take number one with my shot?
Nothing in it is a hormone or a drug. Show the label to your pharmacist first. That matters most if you take hormone therapy, birth control or a blood thinner.
How long before I see a difference?
About 12 weeks. For the first 4 weeks, you won't see much. Check your part at week 8, and decide at week 12.
Or you close this page. That's allowed.
Nothing happens. The shedding stops in its own time, and you keep an eye on the part in your hair.
You know the five things now. Next time, check the back before you buy.
Get number one, buy 2 get 1 free →© 2026 HALO Health. All rights reserved.