Yes, hair loss can happen on GLP-1 medications. In the large placebo-controlled weight-loss trials, about 3% of adults taking semaglutide 2.4mg and 4% to 5% of adults taking tirzepatide reported hair loss, compared with about 1% on placebo. Both FDA prescribing labels say the hair loss was associated with weight reduction.
In most cases, the cause is telogen effluvium: a temporary wave of shedding that can follow rapid weight loss, a big drop in calories or protein, or another physical stress. It usually shows up two to three months after the trigger. It's a non-scarring type of hair loss, so the follicles aren't destroyed and the hair can grow back.
Here's why it happens, which nutrients matter, and when to call your doctor.
How Common Is Hair Loss on GLP-1 Medications?
The clearest numbers come from the FDA prescribing information, which pools the placebo-controlled trials in adults with obesity or overweight.
| Medication and weekly dose | Hair loss on medication | Hair loss on placebo |
|---|---|---|
| Semaglutide 2.4mg | 3% | 1% |
| Semaglutide 7.2mg | 6% | 1% |
| Tirzepatide 5mg / 10mg / 15mg | 5% / 4% / 5% | 1% |
Hair loss was reported far more often by women than men: 7.1% of women versus 0.5% of men on tirzepatide, and 4% of women versus 0.9% of men on semaglutide 2.4mg. European prescribing information for semaglutide adds that it was more common in people who lost 20% or more of their body weight.
These trials weren't designed to compare medications, so the table isn't a ranking. Dermatologists note that cause and effect hasn't been proven and that a direct effect on hair follicles hasn't been shown. The leading explanation is the weight loss itself. For the bigger picture, see our overview of GLP-1 side effects and what to expect.
Why It Happens: Telogen Effluvium
Each hair follows its own cycle. About 90% of scalp hairs are in a growing phase that lasts two to five years. About 10% are in a resting phase of roughly three to five months, after which the old hair falls out and a new one starts.
A sudden stress can push many growing hairs into the resting phase at once. A few months later, they shed together. Dermatology reviews list sudden weight loss, lower protein intake, severe calorie restriction, surgery, high fever and childbirth among the classic triggers.
GLP-1 medications turn appetite down a lot. A 2025 joint advisory from four obesity and nutrition organizations notes observed calorie reductions of 16% to 39%. Stress from rapid weight loss is the main suspected trigger for shedding, and eating less can also leave you short on protein and nutrients like iron and zinc.
Shedding can also make existing pattern hair loss, a gradual thinning at the part or crown, easier to see. That's one reason to see a dermatologist if thinning doesn't improve.
When Shedding Starts and How Long It Lasts
Because hairs rest before they fall, shedding usually starts two to three months after the trigger, which is why it can seem to come out of nowhere. You may see more hair in the drain, on your pillow or in your brush. It's usually spread across the scalp rather than in patches.
Acute telogen effluvium lasts less than six months by definition, and the large majority of cases resolve. Short new hairs along your hairline are a sign of recovery. Dermatologists note that shedding tends to stop once weight loss levels off, especially with good nutrition. Because hair grows slowly, fullness can take several more months to return.
The Nutrients That Matter for Hair
Nutrition can't override the hair cycle, but running low on certain nutrients can cause or prolong shedding. Here's what the evidence supports. For a wider look, see our guide to nutrient deficiencies on GLP-1 medications.
Protein
Hair follicles are among the most metabolically active tissues in the body, and serious protein shortfalls are a known cause of thinning and shedding. On a GLP-1, protein is often the first thing to slip. The 2025 advisory notes that targets of 1.2 to 1.6g per kilogram of body weight per day have been proposed during active weight loss, and that a simple goal of 80 to 120g a day may be easier to follow. Your clinician can help you choose a number. For practical ideas, read how to get enough protein on a GLP-1.
Iron and Ferritin
Iron deficiency is the world's most common nutritional deficiency and a well-known cause of hair loss. A 2026 meta-analysis found that people with telogen effluvium tended to have lower ferritin (your iron stores) and lower vitamin D than people without it, though whether low-normal iron stores alone cause shedding is still debated. Don't guess with iron. Too much can build up and cause harm, so take it only if testing shows you need it.
Zinc
Zinc deficiency can cause telogen effluvium and brittle hair, and in small reports of truly deficient people, hair loss improved once the deficiency was corrected. There's little evidence zinc helps when your levels are normal, and too much over time can cause problems, including interfering with iron.
Vitamin D
Vitamin D appears to play a role in the hair cycle, but studies showing that supplements improve hair loss are lacking. If a test shows you're low, your clinician will likely recommend correcting it. Just don't expect it to work as a hair treatment on its own.
Biotin
Biotin is heavily marketed for hair, but true deficiency is rare, and no clinical trials have shown it treats hair loss in people who aren't deficient. A review of published cases found that everyone who improved on biotin had an underlying problem, such as a deficiency or a specific hair or nail disorder.
Biotin can also affect blood work. The FDA has warned since 2017 that biotin, often found in dietary supplements, can significantly interfere with certain lab tests and cause wrong results that may go unnoticed. In a small study, 10mg of biotin a day for one week caused falsely high or low results on about 4 in 10 of the biotin-based tests studied, which included thyroid, vitamin D and ferritin tests. If you take anything with biotin, including a multivitamin, tell your clinician and the lab before a blood draw.
More Isn't Better
Too much selenium, vitamin A or vitamin E has been linked to hair loss. Stacking several supplements with the same nutrients can push you past safe amounts without realizing it.
Gentle Hair Care While Your Hair Recovers
Hair care can't change the shedding cycle, but it can limit breakage. The American Academy of Dermatology suggests:
- Use a mild shampoo and a moisturizing conditioner every time you wash.
- Skip tight ponytails, buns and braids.
- Use the lowest blow-dryer setting or air-dry, and save flat irons and curling irons for special occasions.
- Hold off on at-home coloring, perms and chemical straightening.
- Brush or comb gently, and only as much as you need to style.
- Wrap wet hair in a microfiber towel to help it dry faster.
- If you smoke, this is one more reason to stop.
Regular meals help too. When you're rarely hungry, eating at set times makes it easier to get enough protein, and the 2025 advisory encourages regular mealtimes on GLP-1 medications.
Where Preserve and Daily Essentials Fit
Food comes first, but when your appetite is low, two auravi formulas can help cover gaps. Neither is a hair-loss treatment, so check with your prescriber before adding any supplement.
Preserve provides 5,000mg of all nine essential amino acids per scoop, plus creatine and HMB, in a light drink that's easy on a small appetite. Amino acids are the building blocks of protein, so Preserve is a simple add-on for days when eating enough protein feels hard, and it helps maintain lean muscle while you lose weight.* It works alongside protein-rich meals, not instead of them.
Daily Essentials helps fill nutrient gaps when you're eating less.* Each two-capsule serving includes biotin 330mcg, zinc 24mg and selenium 230mcg. It contains no iron, so ask your clinician whether you should have your iron checked. Because it already provides zinc, selenium and vitamin A, avoid doubling up with other products that contain them, and mention it before any blood test since it contains biotin.
When to See a Doctor or Dermatologist
Mild, even shedding a few months into treatment is common and usually temporary. Check in with your prescriber or a dermatologist if you notice:
- Bald patches or round spots rather than overall thinning
- Scalp redness, scaling or sores that don't go away
- Loss of eyebrows, eyelashes or body hair
- Shedding that lasts longer than six months or keeps getting worse
- A widening part or thinning at the crown
- Other possible signs of low nutrients, such as unusual fatigue, flaky skin, slow wound healing or easy bruising
Your clinician will decide which tests make sense. Labs worth asking about include:
- Complete blood count (CBC) to screen for anemia
- Ferritin and iron studies to check your iron stores
- Thyroid-stimulating hormone (TSH), since both an overactive and an underactive thyroid can trigger shedding
- 25-hydroxyvitamin D to check your vitamin D level
- Zinc, especially if you eat mostly plant-based, have had weight-loss surgery or have ongoing digestive problems
Bring a list of every supplement you take, especially anything with biotin. And don't stop or change your GLP-1 dose on your own. Your prescriber can look at the whole picture, including how quickly you're losing weight, and decide whether a change makes sense.
Frequently Asked Questions
Will My Hair Grow Back?
In most cases, yes. Telogen effluvium is non-scarring, and most acute cases resolve within about six months, though fullness can take longer to return. If shedding continues past six months, see a dermatologist.
Should I Stop My GLP-1 Medication If My Hair Is Falling Out?
Not on your own. Shedding linked to weight loss tends to settle once your weight levels off. Your prescriber can review your nutrition and labs and decide whether any change makes sense.
Does Biotin Help With GLP-1 Hair Loss?
Only if you're actually low in biotin, which is rare. It can also interfere with some blood tests, so tell your clinician and the lab if you take it.
Can I Lower My Chances of Shedding?
There's no guarantee, but the basics help. Eat regular meals with protein at each one, correct any deficiencies your clinician finds, and go easy on heat and tight hairstyles. If you're losing weight very quickly or struggling to eat, tell your prescriber.
Sources
- U.S. National Library of Medicine. Semaglutide injection: prescribing information (chronic weight management), section 6.1 Adverse Reactions. DailyMed. Accessed 2026. DailyMed
- U.S. National Library of Medicine. Tirzepatide injection: prescribing information (chronic weight management), section 6.1 Adverse Reactions. DailyMed. Accessed 2026. DailyMed
- Piraccini BM et al. Hair loss in patients on glucagon-like peptide 1 receptor agonists: understanding risks and managing outcomes. Dermatol Ther (Heidelb). 2026. PubMed
- Asghar F et al. Telogen effluvium: a review of the literature. Cureus. 2020. PubMed
- Chien Yin GO et al. Telogen effluvium: a review of the science and current obstacles. J Dermatol Sci. 2021. PubMed
- Guo EL, Katta R. Diet and hair loss: effects of nutrient deficiency and supplement use. Dermatol Pract Concept. 2017. PubMed
- Mozaffarian D et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025. PubMed
- Trost LB et al. The diagnosis and treatment of iron deficiency and its potential relationship to hair loss. J Am Acad Dermatol. 2006. PubMed
- Ahmed A et al. Association between serum trace elements and telogen effluvium: a systematic review and meta-analysis. Skin Appendage Disord. 2026. PubMed
- Patel DP et al. A review of the use of biotin for hair loss. Skin Appendage Disord. 2017. PubMed
- Li D et al. Association of biotin ingestion with performance of hormone and nonhormone assays in healthy adults. JAMA. 2017. PubMed
- U.S. Food and Drug Administration. Biotin interference with troponin lab tests: assays subject to biotin interference (links the FDA safety communication "The FDA Warns that Biotin May Interfere with Lab Tests"). FDA. 2022. FDA
- American Academy of Dermatology Association. Hair loss: tips for managing. AAD. Accessed 2026. AAD
This article is for educational purposes only and is not medical advice. Talk with your healthcare provider before changing your diet, exercise or supplement routine, especially while taking a GLP-1 medication. *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.
