GLP-1 & your hair
Biotin or Collagen for GLP-1 Hair Loss? Neither Stops Thinning on Top
On the shot or about to start? What biotin and collagen do for your hair, and 5 picks checked label by label.
- Biotin and collagen feed your hair. Neither one works on DHT, the hormone that thins hair on top.
- Big biotin doses can throw off blood tests, including thyroid tests. Three of the five below have that much.
- 5 things women take, checked on the same 5 points. Only one gets all 5 right.
Biotin and collagen feed your hair, and you can keep taking them. Neither one works on DHT. That’s the hormone that thins hair on top as the weight comes off.
Big biotin doses can also throw off blood tests. The top pick below keeps biotin low. It also has two plants studied for slowing DHT.
The shot worked, and the weight is finally coming off. Then your hair starts falling out. Everyone says the same thing: take biotin, or collagen in your coffee.
Not on the shot yet? Maybe you’re buying them before your first dose.
Both are cheap and easy, and both feed the hair. But they don’t work on the hormone that thins hair on top.
Why it happensWhat's going on
Most of the hair in the drain is shedding from losing weight fast. It comes out all over your head, then stops by itself.
Thinning on top is different. Two hormones 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 helps keep DHT away from the hair roots on top.
- 2You lose fat fast
Your body fat makes some of your estrogen. Less fat means less estrogen.
- 3The hair on top thins
DHT gets to the roots on top. Each new hair comes in thinner.
How it startsHow you got here
Usually, the weight comes off fast. Two or three months later, your hair starts falling out.
Someone online says biotin. Your stylist says collagen in your coffee.
So you take both, along with your protein and a multivitamin. Lots of women do the same, some before the first shot.
I TRIED to prevent it this time by eating more than enough protein, taking a multi vit, a hair skin and nails vit and collagen...no dice.
Posted in a GLP-1 group on Reddit
Nobody did anything wrong. Biotin and collagen feed the hair, but they don’t work on DHT.
Big doses of biotin can also throw off blood tests, including thyroid tests.
Blood work is common before the first shot, and while you’re on it. Tell the lab about any biotin before they draw blood.
The checksThe 5 things that matter
A hair product can do two jobs. One is feeding the hair. The other is guarding the roots from DHT.
For guarding the roots, researchers have studied two plants. One is pumpkin seed oil. The other is saw palmetto, the berry of a small palm tree.
What to look for on the label
Here’s what to look for on the back of the bottle or jar.
- Made for women. It says women losing hair on top, not just “hair.”
- Feeds the hair. It has things hair uses, like protein, zinc or a little biotin.
- The DHT job. It has pumpkin seed oil and saw palmetto, with the amounts.
- Blood tests. Low biotin and no iodine, so your blood tests stay accurate.
- 12 weeks. Hair needs about 12 weeks to show a change. Enough for 12 weeks costs about $60 or less.
We checked every product below on these same five things.
The rankingThe 5 picks, worst to best
Biotin gummies and collagen powder are what women on the shot reach for first. We checked four well-known ones and one more, straight off the back label.
✓ Gets it right · ✕ Problem · ! Okay, not ideal
SugarbearPRO Hair Vitamin Gummies
1 gummy a day
Gets 1 of 5 right- Made for Hair gummies for anyone
- Feeds the hair Biotin, zinc and vitamins
- The DHT job No saw palmetto, no pumpkin seed oil
- Blood tests Biotin 6,000 mcg, plus iodine
- 12 weeks About $120
- Price About $40 a month
Verdict. It’s the easiest to take, one gummy a day. But the biotin is high, and nothing in it works on DHT. For the price, it does the least here.
Nature's Bounty Biotin 10,000 mcg
1 softgel a day
Gets 2 of 5 right- Made for Anyone: energy, skin and hair
- Feeds the hair Biotin, and only biotin
- The DHT job Nothing for DHT
- Blood tests Biotin 10,000 mcg, the most here
- 12 weeks One bottle, under $20
- Price Under $20 for 4 months
"Biotin can mess up the blood tests"
Posted in a GLP-1 group on RedditVerdict. It’s cheap and easy, one softgel a day. But it’s the biggest biotin dose here, and that much can throw off a thyroid test. It does nothing about DHT.
OLLY Heavenly Hair Gummies
2 gummies a day
Gets 2 of 5 right- Made for Says hair, not women
- Feeds the hair Biotin, zinc and keratin
- The DHT job Nothing for DHT
- Blood tests Biotin 3,000 mcg a day
- 12 weeks About $48
- Price About $16 a month
Verdict. It’s cheap and tasty, and every amount is printed. It feeds the hair, but nothing in it works on DHT. And there’s enough biotin to throw off a test.
Vital Proteins Collagen Peptides
Powder, 20 grams a day
Gets 2 of 5 right- Made for Anyone: skin, hair, nails, joints
- Feeds the hair 20 grams of collagen, real protein
- The DHT job Collagen only
- Blood tests No biotin, no iodine
- 12 weeks About $135
- Price About $45 a tub that lasts 4 weeks
Verdict. It’s good protein with just one ingredient, and it won’t throw off a blood test. Keep it in your coffee if you like it. It just can’t do anything about DHT.
HALO Hair
2 softgels a day
Gets 5 of 5 right- Made for Women losing hair on top
- Feeds the hair Zinc, selenium, copper, a little biotin
- The DHT job 1,000 mg pumpkin seed oil, 320 mg saw palmetto
- Blood tests Biotin 100 mcg, no iodine
- 12 weeks $59.99 for three bottles
- Price $20 a bottle when you buy 3, more than a gummy
Verdict. The only one here that gets all five. It has 1,000 mg pumpkin seed oil and 320 mg saw palmetto, and biotin stays low. It’s made for thinning on top, on the shot or before you start.
Prices and labels checked September 2026.
Get number one, buy 2 get 1 free →Number oneWhat's inside number one, and how it works
You take two softgels a day. Here’s everything in them, and how much. Every amount is printed on the label.
| Ingredient | Per day | What it does |
|---|---|---|
| Pumpkin seed oil, cold-pressed | 1,000 mg | Slows DHT at the root |
| Saw palmetto extract | 320 mg | Slows DHT too, in its own way |
| Zinc | 10 mg | A mineral hair roots use to grow |
| Selenium | 55 mcg | A mineral that helps protect cells |
| Copper | 1 mg | A mineral hair uses for its color |
| Vitamin E | 50 mg | An everyday antioxidant |
| Biotin | 100 mcg | Low on purpose, so it won’t throw off blood tests |
| Iodine | None | Left out on purpose |
How it works
Estrogen helps guard the top. On the shot, it drops along with the fat.
Women make a little testosterone too. At the root, a natural switch called an enzyme turns it into DHT. That’s the hormone that thins the top.
Both plants slow that switch, so less DHT reaches the roots on top.
Each plant does this in its own way. No prescription needed.
Not on the shot yet? You can start number one with your first shot, before your estrogen drops.
Why the biotin is low
Your body needs about 30 mcg of biotin a day. Number one has 100 mcg, which covers it.
The biotin gummies and softgel above have 3,000 to 10,000 mcg. More isn’t better for hair. And that much can throw off a blood test.
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.
What the research says
There’s one small study, in men. The men took 400 mg of pumpkin seed oil a day for 24 weeks. At the end, they had about 40% more hairs.
There’s no study like it in women. Number one has 1,000 mg of pumpkin seed oil 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. And it keeps biotin low.
It doesn’t replace your protein or collagen. It does the other job, guarding the roots on top from DHT.
See the full label →Your turnNow check yours
Already taking something for your hair? Check the jar or bottle for the same five things.
- Does it say women on the front?
- Does it feed the hair, with protein, zinc or a little biotin?
- Are pumpkin seed oil and saw palmetto both on it, with amounts?
- Is biotin low, with no iodine?
- Does enough for 12 weeks cost about $60 or less?
How many did it get? Most biotin and collagen jars get one or two.
That’s not your fault. 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.
What women ask about biotin and collagen on a GLP-1
Does biotin help GLP-1 hair loss?
It mostly helps if you’re low on biotin, and few people are. It does nothing about DHT, the hormone that thins hair on top.
Will biotin mess with my blood tests?
It can. Big doses can throw off some lab tests, including thyroid tests. Tell your doctor or the lab about it before they draw blood.
Is collagen worth it on a GLP-1?
Collagen is good protein, and protein protects your muscle. Keep taking it. It just doesn’t help with thinning on top.
Can I keep my collagen and add number one?
Yes. They do different jobs. Number one has only 100 mcg of biotin, so it won’t add a big dose. Show the label to your pharmacist first, especially if you take hormones, birth control or a blood thinner.
How long before I see a difference?
About 12 weeks. Hair needs that long to show a change. As doctors say, shedding usually settles 3 to 6 months after your weight levels off. Starting soon? Begin number one with your first shot. By month 3, when shedding often starts, you’ll be 12 weeks in.
Or you can just close this page.
The jar runs out, you buy another, and you keep checking your part in the mirror.
You know the five things now. Next time a jar catches your eye, check the back.
Get number one, buy 2 get 1 free →© 2026 HALO Health. All rights reserved.