GLP-1 & your hair
Does GLP-1 Cause Hair Loss? Yes, It Can. Here's Why
On the shot or about to start? When hair loss starts, why the top can keep thinning, and 5 things women take for it.
Yes, it can. Most of it is shedding: extra hair falling out after fast weight loss. It usually shows up around month 3 or 4 and settles by itself.
For some women, the top keeps thinning after the shedding stops. Number one in the ranking below is made for the top, whether you're on the shot or about to start.
- Every GLP-1 label lists hair loss. Women get it far more often than men.
- Losing a few extra hairs early on is normal. The heavy shedding usually comes around month 3 or 4.
- Protein, biotin and collagen feed your body and hair. None of them slows DHT, the hormone that thins hair on top.
- 5 things women take for it, checked on the same 5 points. One gets all 5 right.
Maybe you haven't had your first shot yet. Maybe you're a few weeks in, and there's more hair in the brush than last month.
Either way, you've heard the advice: eat more protein and wait it out.
It's good advice. It just says nothing about the top of your head.
Why it happensWhat's going on
Fast weight loss can make a lot of hair fall out at once, all over. That's shedding, and it settles by itself.
The top of your head can thin for a second reason.
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.
- 1Estrogen guards the top
It keeps DHT from shrinking the roots on top.
- 2The shot takes fat fast
Part of your estrogen is made in fat, so less fat means less estrogen.
- 3The top thins. The back doesn't.
DHT reaches the roots on top, and each new hair grows in thinner.
Where you are right now
Haven't started yet? It's normal to worry. Hair loss is on every label, and women talk about it online.
It helps to know when it comes. Shedding usually starts around month 3 or 4. So you have time to get ready.
Already on it? The scale finally moves. Then the drain fills up with hair.
“I’m currently 11 weeks in and 36 lbs down!!! … No side effects but my hair is thinning.”
A woman on the shot, 11 weeks in
None of that is your fault. It's what fast weight loss does. Women get it far more often than men.
Check the labelThe 5 things that matter
What to look for
Here’s what to look for on the back of the bottle.
- Made for women. It says women on the front, not just hair, skin and nails.
- The DHT job. It has pumpkin seed oil and saw palmetto, with the amounts. Saw palmetto is a palm berry. Both plants have been studied for slowing DHT.
- Form and dose. Two a day or less. Each ingredient shows its own amount, not one total for a “blend.”
- Easy on blood tests. Biotin under 1,000 mcg and no iodine, so your blood tests stay accurate.
- 12 weeks, fair price. Hair needs about 12 weeks to show a change. Those 12 weeks should cost about $60 or less.
We checked every product below on these same five things.
Worst to bestThe ranking
Women on the shot get told to take protein, biotin and collagen. We checked those on the same 5 things, plus Nutrafol, the best-known hair supplement, and HALO Hair.
✓ Gets it right · ✕ Problem · ! Okay, not ideal
Premier Protein 30g Protein Shake
1 shake a day
Gets 1 of 5 right- Made for Muscle, for anyone
- The DHT job Protein and vitamins, nothing for DHT
- Form and dose A drink, every amount printed
- Blood tests Low biotin, a little iodine
- 12 weeks About $168
- Price About $24 for 12 shakes
Verdict. Keep drinking it. On the shot, protein protects your muscle. It does nothing about DHT on top.
Vital Proteins Collagen Peptides
2 scoops a day
Gets 1 of 5 right- Made for Skin, hair, nails and joints, for anyone
- The DHT job Collagen only, nothing for DHT
- Form and dose 2 scoops of powder, amount printed
- Blood tests No biotin, no iodine
- 12 weeks About $135
- Price About $45 a tub
Verdict. Easy to stir into your morning coffee, and fine for blood tests. But it's just protein. It does nothing about DHT.
Nutrafol Women
4 capsules a day
Gets 1 of 5 right- Made for Women
- The DHT job Saw palmetto in it, amount not printed
- Form and dose 4 capsules, plants in a blend
- Blood tests Biotin 3,000 mcg, plus iodine
- 12 weeks About $224, even with a subscription
- Price About $88 a month
Verdict. The best-known name, made for women, with real saw palmetto inside. You just can't see how much. One month costs more than 12 weeks of number one.
Nature's Bounty Biotin 10,000 mcg
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
- Form and dose 1 softgel, amount printed
- Blood tests 10,000 mcg of biotin a day
- 12 weeks About $8, one bottle lasts 4 months
- Price About $8 a bottle
Verdict. The cheapest bottle in the aisle, and easy to take. Biotin only helps hair if you're low on it. Most people aren't. This dose can throw off a thyroid test.
HALO Hair
2 softgels a day
Gets 5 of 5 right- Made for Women losing hair on top
- The DHT job Pumpkin seed oil and saw palmetto
- Form and dose 2 softgels, every amount printed
- Blood tests Biotin 100 mcg, no iodine
- 12 weeks $59.99 for three bottles
- Price $20 a bottle, more than plain biotin
Verdict. The only one here that gets all five right. 1,000 mg pumpkin seed oil, 320 mg saw palmetto, biotin kept low. Take it on the shot, or start it with your first shot.
Prices and labels checked September 2026.
Number oneWhat's inside number one, and how it works
Here's what's in two softgels, straight off the label. Nothing is hidden in a blend.
| Ingredient | Per day | What it does |
|---|---|---|
| Pumpkin seed oil, cold-pressed | 1,000 mg | Slows how much DHT is made at the root |
| Saw palmetto extract | 320 mg | Slows it too, in a second way |
| Zinc | 10 mg | Helps keep hair growing normally |
| 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 wear |
| Biotin | 100 mcg | Low on purpose, so blood tests stay accurate |
| Iodine | None | Left out, for women watching their thyroid |
How it works. Estrogen helps guard the roots on top. On the shot, you lose some of it along with the fat.
Women make a little testosterone too. At the root, a natural helper called an enzyme turns some of it into DHT.
DHT is the hormone that makes each new hair on top grow in thinner.
Both plants slow that enzyme, right at the root. So less DHT gets made, and less of it reaches the roots on top.
Each plant slows it in its own way. No prescription needed.
Where it comes from. 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.
The research. There is one trial, and it was in men. They took 400 mg of pumpkin seed oil a day for 24 weeks.
At the end, their hair count was up about 40%.
There's no trial in women yet. Number one has 1,000 mg a day.
What makes it different. 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.
Get number one, buy 2 get 1 free →Now check yours
Already taking something? Check the back of the bottle for these five things. Not yet? Use them on the next one you pick up.
- Does the front say women?
- Are pumpkin seed oil and saw palmetto both on it?
- Is every amount printed, with no blend?
- Is biotin under 1,000 mcg, with no iodine?
- Do 12 weeks cost about $60 or less?
Count how many it gets right.
If yours gets only one or two, that's not a mistake you made. You picked it off the same shelf everyone does.
What number one costs
Buy once, or subscribe and save from $24.99. Free US shipping on 3 or more. 90-day money back.
What women ask about GLP-1 and hair
When does GLP-1 hair loss start?
Most women notice it around month 3 or 4. Losing a few extra hairs in the first weeks is normal too.
Is it the shot, or the weight loss?
Mostly the fast weight loss. In the drug makers’ own studies, hair loss came with the weight loss. Less fat also means a bit less estrogen. That can thin the top.
How do I know if it's more than shedding?
Shedding comes out all over. It slows once your weight holds steady. A part that keeps getting wider is thinning on top. Still shedding 6 to 9 months after your weight holds steady? See your doctor. Ask about iron, thyroid and vitamin D.
Can I take number one with the shot?
It has no hormones and no drugs in it. Show the label to your pharmacist first, especially if you take hormones, birth control or a blood thinner.
Should I start before my first shot?
You can start the same week. Three bottles last 12 weeks. That takes you past month 3, when shedding usually starts.
Or you close this page. That's allowed.
Nothing happens. The shot does its job, and you keep an eye on the part in your hair.
You know the five things now. You can check any bottle yourself.
Get number one, buy 2 get 1 free →© 2026 HALO Health. All rights reserved.