Quick answer: Extra hair shedding can happen during GLP-1 treatment, but it is uncommon and usually temporary. In clinical trials of semaglutide and tirzepatide for weight management, about 4–7% of women reported hair loss, compared with 1–2% on placebo. The most likely explanation is telogen effluvium, a delayed, temporary shedding that follows rapid weight loss or low nutrient intake, and it typically settles within months once weight and nutrition stabilize. No supplement has been shown to prevent or treat it. The most useful steps are eating enough protein and nutrient-dense food, avoiding megadoses, and asking your healthcare provider to check for common causes such as low iron or a thyroid problem.
What the research actually shows
Hair shedding is one of the most searched worries about GLP-1 medications, and the numbers are more reassuring than social media suggests.
- Semaglutide 2.4 mg: the U.S. prescribing information reports hair loss in 3.3% of adults (4% of women, 0.9% of men) versus 1% on placebo (2% of women, 0% of men) [1].
- Tirzepatide: the prescribing information reports hair loss in 7.1% of women and 0.5% of men, versus 1.3% of women and 0% of men on placebo [2].
- More weight lost, more shedding: a 2026 systematic review noted hair loss in 5.3% of semaglutide users who lost more than 20% of their body weight, compared with 2.5% of those who lost less [3].
- Pooled data: a 2026 meta-analysis of 17 studies found about a 40% higher odds of non-scarring hair loss with GLP-1 receptor agonists, with telogen effluvium the most strongly linked subtype [4].
In other words, most women using these medications do not report hair loss, but women report it more often than men, and the risk rises with faster or larger weight loss.
Why shedding happens: telogen effluvium explained
Each hair follicle cycles through a growth phase and a resting phase. A significant physical stress can push many follicles into the resting phase at once. Two to three months later, those hairs fall out together, which is why shedding often seems to appear out of nowhere [5].
The American Academy of Dermatology lists losing 20 pounds (about 9 kg) or more as a common trigger, alongside childbirth, high fever, surgery, and major stress [6]. A restrictive diet that is low in protein is another recognized trigger [5]. GLP-1 medications reduce appetite, so both conditions can occur together: fast weight loss and smaller, less varied meals.
Researchers are still studying whether the medications affect hair follicles directly. One large 2026 cohort study found a higher risk of several types of hair loss in semaglutide and tirzepatide users and noted that weight loss alone may not fully explain it [7]. This is an open question, not a settled one.
Myths vs. facts
Myth 1: "Everyone on a GLP-1 loses their hair."
Fact: In the trials above, more than 90% of women did not report hair loss [1, 2].
Myth 2: "The hair loss is permanent."
Fact: Telogen effluvium is temporary. It usually lasts three to six months, and hair typically regains its normal fullness within about six to nine months once the trigger settles [5, 6]. Shedding can, however, reveal an underlying pattern hair loss that was already developing, which is a good reason to get persistent thinning checked [3].
Myth 3: "Biotin will fix it."
Fact: Biotin deficiency is rare, and the U.S. National Institutes of Health describes the evidence for biotin and hair as limited to a few case reports and small studies. High-dose biotin can also distort lab results, including thyroid and troponin tests [8]. Tell your provider if you take it.
Myth 4: "More vitamins means more hair."
Fact: A dermatology review concluded that correcting a confirmed deficiency (especially iron or vitamin D) is reasonable, but that too much vitamin A or selenium can itself cause hair loss [9]. The adult upper limit for selenium is 400 mcg per day, and long-term zinc intakes of 50 mg or more can interfere with copper absorption [10, 11].
Myth 5: "I should stop my medication right away."
Fact: Do not stop or change a prescribed medication on your own. Shedding often eases as weight stabilizes, and your prescriber can discuss dose pacing and check for other causes [3].
What you can do: a food-first plan
1. Make protein the anchor of every meal
Hair is built from protein, and low protein intake is a known shedding trigger [5]. When appetite is small, eat the protein portion first: eggs, Greek yogurt, fish, poultry, tofu, tempeh, lentils, or beans. A joint advisory from four U.S. nutrition and obesity medicine societies identifies adequate protein and nutrient-dense food as priorities during GLP-1 therapy [12]. Ask your provider or a registered dietitian for a daily target that fits your body and health history.
2. Cover iron, zinc, and vitamin D through food
- Iron: lean meat, seafood, poultry, beans, lentils, and spinach. Pair plant sources with vitamin C foods such as citrus, peppers, or tomatoes to improve absorption. Women with heavy periods are at higher risk of low iron [13].
- Zinc: seafood, beef, eggs, dairy, beans, nuts, and whole grains [11].
- Vitamin D: fatty fish, eggs, and fortified foods, plus testing if your provider recommends it.
3. Avoid very fast weight loss
Because larger and faster losses are linked with more shedding [3], follow the dose schedule your prescriber sets rather than rushing it, and do not add crash dieting on top of a reduced appetite.
4. Be gentle with your hair
Limit tight hairstyles, high heat, and harsh chemical treatments while shedding is active.
5. Test before you supplement
If shedding continues, reviewers suggest providers consider a complete blood count, ferritin, thyroid-stimulating hormone, and vitamin D [3]. Results tell you whether a targeted supplement is needed and at what dose.
Where Beauty Secret® 20+ fits
We want to be direct about this. Beauty Secret® 20+ is not a hair-growth product. It has not been studied for hair shedding, and it does not prevent or treat hair loss associated with GLP-1 medications or weight loss.
What it is: a daily sachet for adult women, licensed in Canada as a natural health product (NPN 80073784). Each 10 g serving provides soy seed powder, chaga mycelia, vitamin C (100 mg), vitamin D3 (400 IU), vitamin E, coenzyme Q10, and astaxanthin, along with botanical ingredients. Its authorized uses are to help maintain good health, as a source of antioxidants, and as a source of fungal polysaccharides with immunomodulating properties.
What it is not: it is not a meaningful source of protein, iron, or zinc, the nutrients most often discussed in relation to hair shedding. It does not replace meals, lab testing, or medical care, and it is not required with any medication.
Some women choose it as one simple, consistent part of a broader self-care routine built on balanced meals, adequate protein, and regular check-ins with their provider. If you take other supplements, compare labels so you do not double up on vitamin D or vitamin E, and ask your provider or pharmacist whether it suits you, particularly if you are pregnant, breastfeeding, have a medical condition, or take prescription medication. Product availability and labelling vary by country.
Signs to discuss with your healthcare provider
- Shedding that lasts longer than six months or keeps getting worse
- Round or patchy bald spots, a widening part, or a receding hairline
- Scalp redness, scaling, pain, or itching
- Fatigue, feeling cold, heavy periods, brittle nails, or shortness of breath (possible low iron or thyroid issues)
- Eating very little, or losing weight much faster than expected
- Any new symptom after starting or changing a medication or supplement
A referral to a dermatologist is reasonable when shedding persists beyond six to nine months or follows a pattern [3].
Frequently asked questions
Do GLP-1 medications cause hair loss?
Hair loss is listed as a reported side effect of semaglutide and tirzepatide for weight management, affecting a small minority of users and women more often than men [1, 2]. The leading explanation is temporary shedding triggered by rapid weight loss and reduced intake, although a direct drug effect has not been ruled out [3, 7].
When does the shedding start, and how long does it last?
Telogen effluvium usually begins two to three months after the trigger and lasts about three to six months. Most people see fullness return within six to nine months [5, 6].
Will my hair grow back?
In telogen effluvium the follicles are not damaged, so regrowth is expected once the trigger settles and nutrition is adequate [5]. If thinning follows a pattern or does not recover, see a dermatologist, because other types of hair loss need different care.
Should I take biotin or a hair vitamin?
There is little evidence that biotin helps people who are not deficient, and high doses can interfere with lab tests [8]. Excess vitamin A and selenium can cause hair loss [9, 10]. It is safer to test first and supplement only what you need.
Does eating more protein prevent GLP-1 hair shedding?
No study has proven that it prevents shedding. Adequate protein is still worth prioritizing, because low protein intake is a recognized trigger and protein supports overall health during weight loss [5, 12].
The bottom line
Hair shedding during GLP-1 treatment is real but uncommon, more frequent in women, and usually temporary. It appears to track with how much and how quickly weight is lost. You cannot supplement your way out of it, but you can lower avoidable risks: eat enough protein and nutrient-dense food, avoid megadoses, pace your weight loss with your prescriber, and get persistent or patterned hair loss evaluated.
Medical disclaimer: This article is for general education only and is not medical advice. It does not diagnose, treat, cure, or prevent any condition. Do not start, stop, or change any medication or supplement without speaking to a qualified healthcare provider. Product availability, labelling, and regulations vary by country.
Sources
- Novo Nordisk. WEGOVY (semaglutide) injection 2.4 mg, U.S. Prescribing Information, Adverse Reactions. novo-pi.com/wegovy.pdf
- Eli Lilly and Company. ZEPBOUND (tirzepatide) injection, U.S. Prescribing Information, Adverse Reactions. pi.lilly.com/us/zepbound-uspi.pdf
- Gupta AK, Teasell EM, Economopoulos V, Mirmirani P. GLP-1 therapies and hair loss: a systematic review of current evidence and implications for counseling. Science Progress. 2026;109(2). doi:10.1177/00368504261444578
- Viquez Burboa GU, Flores Guillén MAR, Duardo González VS. GLP-1 receptor agonists and alopecia: a systematic review and meta-analysis of incidence, risk, subtypes, and mechanisms. Skin Appendage Disorders. 2026. PubMed 42621629
- Cleveland Clinic. Telogen Effluvium: Symptoms, Causes, Treatment and Regrowth. my.clevelandclinic.org
- American Academy of Dermatology. Do you have hair loss or hair shedding? aad.org
- Herrera HO, Bordeaux JS. Risk of new-onset hair loss with semaglutide and tirzepatide: a TriNetX cohort study. Journal of the American Academy of Dermatology. 2026;94(6):1826-1827. doi:10.1016/j.jaad.2026.02.042
- NIH Office of Dietary Supplements. Biotin: Fact Sheet for Health Professionals. ods.od.nih.gov
- Almohanna HM, Ahmed AA, Tsatalis JP, Tosti A. The role of vitamins and minerals in hair loss: a review. Dermatology and Therapy. 2019;9(1):51-70. doi:10.1007/s13555-018-0278-6
- NIH Office of Dietary Supplements. Selenium: Fact Sheet for Health Professionals. ods.od.nih.gov
- NIH Office of Dietary Supplements. Zinc: Fact Sheet for Health Professionals. ods.od.nih.gov
- 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. Obesity. 2025. doi:10.1002/oby.24336
- NIH Office of Dietary Supplements. Iron: Fact Sheet for Consumers. ods.od.nih.gov