Wegovy (semaglutide) has become one of the most popular medications for chronic weight management in adults with obesity or weight-related health conditions. This once-weekly injection works by mimicking the GLP-1 hormone, helping reduce appetite, slow digestion, and promote steady fat loss. Many users achieve impressive results—often 15–20% of body weight—when combined with a reduced-calorie diet and increased physical activity.
As more people start Wegovy, online forums, social media, and patient communities are filled with reports of unexpected side effects. Hair loss, also called telogen effluvium, appears frequently in these discussions. People notice more strands in the shower, thinning on the scalp, or a wider part line, leading to worry that Wegovy might be the cause.
The question “Does Wegovy cause hair loss?” is one of the most searched topics related to the medication in 2025. While hair shedding is not listed as an official side effect in the prescribing information, the pattern of reports has prompted closer examination. Understanding the connection between rapid weight loss, nutritional changes, and the medication itself provides clearer answers.
How Wegovy Works and Its Effects on the Body
Wegovy activates GLP-1 receptors in the brain, stomach, and pancreas. This reduces hunger signals, slows gastric emptying, and improves insulin response. The result is lower calorie intake and better blood sugar control, leading to consistent weight loss over months.
The weight loss is often rapid in the first 6–12 months. Many patients lose 1–2 pounds per week, sometimes more. This speed can create physical stress on the body, similar to what happens after bariatric surgery or very low-calorie diets.
Hair growth follows a cycle: anagen (growth phase), catagen (transition), and telogen (resting/shedding phase). Normally, about 10–15% of hair is in the telogen phase at any time. Certain stressors can push a much larger percentage into telogen, causing noticeable shedding 2–4 months later.
Does Wegovy Cause Hair Loss: The Direct Answer
Wegovy does not directly cause hair loss. Clinical trials and prescribing information do not list hair loss (alopecia) as an adverse reaction. Large-scale studies, including the STEP trials, did not report increased hair shedding as a side effect of semaglutide itself.
However, rapid weight loss from Wegovy can trigger telogen effluvium, a temporary form of hair shedding. This is a well-known response to significant calorie restriction, nutritional shifts, or physical stress—not unique to Wegovy. It affects a notable portion of users who lose weight quickly, especially in the first 6–12 months. The good news is that this type of hair loss is usually reversible once weight stabilizes and nutrition improves.
Step 1: Track Your Hair Changes and Weight Loss Timeline
Start noticing when shedding increases. Telogen effluvium typically begins 2–4 months after a major stressor, such as rapid weight loss. Count hairs in your brush or shower drain daily for a week to establish a baseline.
Keep a simple log: date, approximate number of hairs lost, and weekly weight change. This helps you and your doctor see if shedding correlates with the period of fastest weight loss.
Step 2: Optimize Nutrition to Support Hair Health
Focus on adequate protein (at least 0.8–1.2 g per kg of ideal body weight daily) from sources like chicken, fish, eggs, Greek yogurt, lentils, and tofu. Hair is made of keratin, a protein, so insufficient intake can worsen shedding.
Ensure you get enough iron, zinc, biotin, vitamin D, and essential fatty acids. Many people on Wegovy eat less overall, so consider a daily multivitamin formulated for hair, skin, and nails. Blood tests can identify deficiencies that contribute to hair loss.
Step 3: Reduce Stress on Hair Follicles and Support Regrowth
Avoid tight hairstyles, excessive heat styling, or chemical treatments during the shedding phase. Gentle handling preserves the hair you still have. Scalp massages with rosemary oil or caffeine shampoos may stimulate circulation and support growth.
Be patient—regrowth usually begins 3–6 months after the trigger (peak weight loss) subsides. If shedding continues beyond 6 months or you notice bald patches, see a dermatologist to rule out other causes.
| Potential Cause of Hair Loss | How Common on Wegovy | Timeline | Reversibility | Prevention / Management Tips |
|---|---|---|---|---|
| Telogen Effluvium (rapid weight loss) | Common (10–30% of users) | 2–4 months after rapid loss | Fully reversible | Slow weight loss, high protein, micronutrients |
| Nutritional deficiency (iron, zinc, biotin) | Moderate | 2–6 months after calorie restriction | Reversible with correction | Multivitamin, blood tests, balanced diet |
| Medication-induced (direct effect) | Not reported in trials | N/A | N/A | Wegovy does not directly cause it |
| Stress (psychological or physical) | Variable | Variable | Usually reversible | Stress reduction, sleep, gentle hair care |
| Other unrelated causes (thyroid, hormones, alopecia areata) | Uncommon | Variable | Varies | See dermatologist for diagnosis |
This table summarizes the main causes of hair loss reported by Wegovy users, how often they occur, and practical steps to address them.
Why Rapid Weight Loss Triggers Hair Shedding
Any significant, quick drop in body weight—whether from medication, surgery, very low-calorie diets, or illness—can push hair follicles into the resting (telogen) phase prematurely. This is a protective response: the body redirects energy from non-essential functions (like hair growth) to vital organs.
On Wegovy, weight loss of 1–2 pounds per week is common, especially early in treatment. For someone starting at 250 pounds, that can mean 20–40 pounds lost in 3–6 months. This speed is enough to trigger telogen effluvium in susceptible individuals.
The shedding is not permanent. Once weight stabilizes and nutrition improves, hair follicles re-enter the growth phase. New hair begins to appear within a few months, and density usually returns to normal within 6–12 months.
Nutritional Factors That Contribute to Hair Loss
Wegovy reduces appetite, often leading to lower overall calorie intake. If protein, iron, zinc, or vitamins are inadequate, hair growth suffers. Iron deficiency is especially common in women and can worsen shedding.
Biotin, vitamin D, and essential fatty acids (omega-3s) also support hair follicle health. Many users unintentionally reduce these nutrients when eating smaller portions. A daily multivitamin designed for hair and general wellness helps fill gaps.
Blood tests for ferritin (iron stores), vitamin D, B12, and zinc are useful when shedding is noticeable. Correcting deficiencies can speed up recovery and prevent worsening.
Other Possible Causes of Hair Loss During Treatment
Some patients experience stress from body changes, lifestyle adjustments, or the pressure to maintain results. Chronic stress can independently trigger telogen effluvium. Hormonal shifts from rapid fat loss may also play a role, especially in women.
Pre-existing conditions such as thyroid disorders, androgenetic alopecia, or alopecia areata can become more noticeable during weight loss. These are not caused by Wegovy but may coincide with treatment.
If shedding is patchy, severe, or accompanied by scalp itching/scaling, see a dermatologist. These patterns suggest other causes that need separate evaluation.
How Long Does Hair Loss Last on Wegovy?
Telogen effluvium from weight loss typically peaks 3–6 months after the period of fastest loss and lasts 3–9 months. Most people notice the heaviest shedding around the 4–6 month mark of treatment.
Regrowth begins once the stressor (rapid weight loss) stabilizes. New hairs appear as short “baby hairs” along the hairline and part. Full density usually returns within 6–12 months after the trigger ends.
Continued slow, steady weight loss and good nutrition minimize the duration and severity. Some patients never experience noticeable shedding if weight comes off gradually.
Practical Tips to Minimize and Manage Hair Loss
Prioritize protein at every meal: eggs, Greek yogurt, chicken, fish, tofu, or protein shakes. Aim for 20–30 grams per meal to support hair and muscle maintenance.
Consider a daily multivitamin with iron, zinc, biotin, and vitamin D. Many users benefit from hair-specific formulas. Get blood levels checked to target supplementation accurately.
Use gentle hair care: avoid tight ponytails, excessive heat, or harsh chemicals. Scalp massages and rosemary oil may improve circulation and support growth.
When to See a Doctor or Dermatologist
If hair loss is severe, patchy, or accompanied by scalp redness, itching, or pain, consult a dermatologist. These signs may indicate a different condition unrelated to Wegovy.
Persistent shedding beyond 6–9 months after weight stabilization should be evaluated. Blood tests can check thyroid function, iron stores, and other markers.
Most cases resolve without intervention. A healthcare provider can reassure you and rule out other causes if you are concerned.
Summary
Wegovy does not directly cause hair loss. However, the rapid weight loss it produces can trigger temporary telogen effluvium, a common and reversible form of shedding that affects 10–30% of users. This occurs because the body prioritizes vital functions during calorie restriction and physical stress.
Hair loss typically starts 2–4 months after significant weight loss, peaks for a few months, and resolves within 6–12 months as weight stabilizes and nutrition improves. Supporting hair health with adequate protein, micronutrients, gentle care, and patience helps speed recovery.
The vast majority of cases are not permanent. The benefits of sustained weight loss and better metabolic health usually outweigh this temporary cosmetic side effect. Always discuss concerns with your healthcare provider.
FAQ
Does Wegovy directly cause hair loss?
No, Wegovy (semaglutide) does not directly cause hair loss. Clinical trials do not list hair loss as a side effect. The shedding reported by many users is telogen effluvium triggered by rapid weight loss, not the medication itself.
How long does hair loss from Wegovy last?
Telogen effluvium from Wegovy-related weight loss usually peaks 3–6 months after the fastest weight loss period and lasts 3–9 months. Regrowth begins once weight stabilizes, with full recovery typically seen within 6–12 months.
How can I prevent or reduce hair loss while taking Wegovy?
Focus on adequate protein (20–30 g per meal), a daily multivitamin with iron/zinc/biotin, and gradual weight loss. Stay hydrated, avoid harsh hair treatments, and manage stress. These steps support hair health during treatment.
Will my hair grow back after stopping Wegovy?
Yes, hair almost always grows back fully after telogen effluvium. Regrowth starts 3–6 months after the trigger (rapid weight loss) ends. Consistent nutrition and patience help speed recovery.
Should I stop Wegovy if I’m losing hair?
No, do not stop Wegovy without consulting your doctor. Hair loss is temporary and not caused directly by the medication. Stopping treatment often leads to weight regain, which can prolong or worsen shedding. Your provider can help manage the issue while continuing therapy.
Dr. Hamza is a medical content reviewer with over 12+ years of experience in healthcare research and patient education. He specializes in evidence-based health information, medications, and chronic conditions. His reviews are grounded in trusted medical sources and current clinical guidelines to ensure accuracy, transparency, and reliability. Content reviewed by Dr. Hamza is intended for educational purposes and is not a substitute for professional medical advice.