GLP-1 Weight-Loss Drugs and Hair Shedding: What Scientists Are Studying Now

For years, researchers have studied how metabolism affects hair growth, an area of scientific study that is of personal and professional interest to me. Now, with the surge in popularity of weight loss medications such as Ozempic, Wegovy, and Mounjaro, dermatologists are reporting an increase in unexpected hair shedding among patients taking these GLP-1 medications, particularly during periods of rapid weight loss, prompting a shift in this field of study.  

While these medications don’t appear to directly damage hair follicles, researchers believe the changes may stem from metabolic and nutritional shifts these drugs create.1

GLP-1 therapies work by slowing digestion and reducing appetite, helping many people lose weight quickly. But sudden weight loss has long been known to trigger a temporary condition called telogen effluvium, where hair follicles prematurely shift from the growth phase into the resting phase.[2]

When this happens, more strands shed than usual, and this often happens two to three months after the initial metabolic event.[3]

Another area gaining attention in the field of hair loss science is protein intake. Because GLP-1 medications suppress appetite, many people unintentionally consume less protein, which can reduce the supply of amino acids needed to build keratin, which is the structural protein that makes up hair.[4, 5]

Dermatologists say this combination of rapid weight loss and reduced protein intake may help explain why some people notice increased shedding while using these medications.

The good news is that telogen effluvium is usually temporary, and hair growth often resumes once the body stabilizes and nutritional intake improves.[6]

Still, the trend highlights something scientists have long understood: Hair follicles are highly sensitive to metabolic changes, and they often act as early signals when the body’s internal environment shifts .Here, some lifestyle tips that my help protect your hair from excess shedding if you’re considering or are currently on a GLP-1 medication.

1. Make a plan with your doctor and/or dermatologist.
   If you’re starting a weight loss medication like Ozempic, Wegovy or Mounjaro, it’s worth having a conversation with your doctor upfront about hair health. Dermatologists can help you monitor for shedding and identify early signs of telogen effluvium, and may suggest strategies to support your scalp and follicles during the weight loss process.

2. Know how much protein you require daily and do some planning to meet your needs.
   Your hair is primarily made of protein so getting enough of this nutrient in your diet is key. General guidelines suggest aiming for roughly 0.8 to 1 gram of protein per kilogram of body weight, though some experts recommend a higher intake during weight loss.7 Consider consulting a nutritionist who can go over your daily diet with you and figure out the proper amount of protein and help you strategize how to get it. If your appetite is low, even being slightly below your protein needs over time can impact hair growth.

3. Fill protein gaps with easy or “complete” options.
   A good way to work more protein into your daily diet is to focus on small protein-rich additions to your meals and snacks. Greek yogurt, cottage cheese, tofu, and lentils are a few examples. Combining plant-based proteins, like rice and beans or hummus and whole grains, can also provide the essential acids your body needs to build keratin.[8]

4. Talk to your doctor if you’re struggling to eat enough. 

If you’re finding it difficult to eat enough to meet your nutritional needs, it’s worth a discussion with your doctor. In some cases, adjusting the dose or pacing of a medication may help reduce the appetite suppression enough to keep you on your weight loss journey and support overall better nutrition, including the nutrients your hair and follicles rely on. 

The Takeaway

Hair shedding can happen while you’re taking a GLP-1, and since these medications are so common, doctors and scientists are studying the mechanisms behind why and what patients can do to mitigate this side effect.

Experts think it’s not the drugs themselves that trigger the hair loss, but rather the results of rapid weight loss and the reduction in protein intake that can happen when your appetite is suppressed.

Frequently Asked Questions

Do GLP-1 medications directly cause hair loss?

Not directly. These medications don’t appear to damage hair follicles themselves. Instead, hair shedding is most likely related to the hormonal and nutrient shifts that come with rapid weight loss. These changes can trigger telogen effluvium, a common form of hair shedding.

Is the hair loss permanent?

In most cases hair loss triggered by taking a GLP-1 is temporary and hair growth resumes once the body adjusts and nutrient intake improves. But it can take several months for shedding to slow and new growth to become noticeable.

What’s the best way to prevent hair shedding while on a GLP-1 medication?

The most effective approach is to support your body throughout the weight loss process. That means maintaining adequate protein intake and working with your doctor or a registered dietitian if you’re struggling to meet your nutritional needs. Watching for early signs of shedding and addressing them can also help minimize the impact.