From Summer Shedding to Summer Growth: How To Promote Strong Hair on a GLP-1

If you're on a GLP-1 medication and noticing more hair in the drain than usual, you're not alone and you're not imagining it. As semaglutide, tirzepatide, and other GLP-1 agonists have transformed the weight loss landscape, doctors and patients have been reporting an uptick in hair thinning and shedding alongside the pounds coming off.

The good news: it's mostly temporary and there's something you can do about it. The key is understanding what's actually driving the shedding.

Why Hair Thinning Happens on a GLP-1

Research so far is reporting that GLP-1 medications don't appear to directly damage hair follicles. What’s happening is that when you lose a lot of weight rapidly (as is often the case when you’re taking a GLP-1), significant physiological changes in your body happen in a short window, and this impacts your hair.

Hair cycles through four phases: anagen (active growth), catagen (transition), telogen (resting), and exogen (shedding). Under normal circumstances, only about 10% of your hair is in the resting or shedding phase at any given time. But when your body experiences significant stress (like rapid weight loss), a much larger number of follicles get pushed into the resting phase simultaneously. The result is a wave of shedding, which typically appears two to three months after the triggering event. The delay is part of why it may take a bit to connect the shedding to the weight loss from the medication.

A 2025 systematic review analyzed 24 studies and confirmed what patients and clinicians had been observing: increased hair shedding affects roughly 5 to 7% of GLP-1 users in clinical trials, with higher incidence at higher doses and among people losing weight rapidly. The review also confirmed that the hair loss is an indirect consequence of rapid weight loss and the nutritional shifts that come with it; not a direct effect of the medication on the follicle. Another factor: When you’re taking a GLP-1 and eating less, it can be difficult to get enough of the nutrients your hair depends on.[1]

Is GLP-1 Hair Loss Permanent? 

The encouraging news: Once weight stabilizes and nutrition improves, shedding typically resolves within a few months. One caveat: In some cases, the metabolic stress of rapid weight loss while you’re on a GLP-1 can unmask androgenetic alopecia, the genetic form of pattern hair loss.[2] If shedding continues beyond six months or seems to be worsening, that's worth investigating further with a doctor.

Protecting Your Hair While On A GLP-1

The factors involved in GLP-1-related hair loss; shifts in nutrition, metabolic stress, elevated cortisol, are things you can work with. It’s a good idea to talk to your doctor and make a proactive plan to help monitor and protect against hair loss. Here's how to address the factors at play, and why starting sooner rather than later makes a difference.

Prioritize Protein 

Hair is made primarily of keratin, a structural protein. Keratin synthesis depends on a steady supply of specific amino acids.[3] When your protein intake drops, the body doesn't have the raw materials to build strong, healthy strands.

GLP-1s work in part by suppressing your appetite, and when you're eating significantly less overall, hitting your protein targets requires intentionality. General guidelines suggest aiming for roughly 0.8 to 1 gram of protein per kilogram of body weight daily, though some experts recommend more during periods of active weight loss.[4]

Focus on protein-dense foods that don't require large portions: Greek yogurt, cottage cheese, eggs, edamame, tofu, lentils. If you're plant-based, combining protein sources, like rice and beans, or hummus with whole grains, can help you get the full range of amino acids your body needs for keratin synthesis.[5]

If getting the protein you need feels impossible, it's worth talking to your doctor. Sometimes a small adjustment in dose or timing is enough to make a meaningful difference.

The Nutrient Gap

In addition to protein, certain nutrients are especially critical for hair follicles and the hair growth cycle to function normally; when your body is low on these nutrients (which can happen when you’re eating less) it prioritizes essential organs and can lead to thinning or increased shedding.[6]
Think of food as daily fuel for your follicles. The following are key nutrients for your hair and the foods they’re found in. 

Iron helps support oxygen delivery to hair follicles and low levels are linked to shedding.
Good sources: Spinach, lean red meat, lentils, pumpkin seeds, fortified cereals.[7]

Vitamin D helps regulate the hair growth cycle and follicle activation.
Good sources: Salmon, sardines, eggs (with the yolks), fortified milks.

Zinc supports follicle repair and can help prevent premature shedding.[8]
Good sources: Chickpeas, lean beef, cashews, pumpkin seeds, oysters.

Omega-3 fatty acids help lower inflammation in the body and reduce oxidative stress which can disrupt the hair growth cycle.[9]
Good sources: Cold water fatty fish including salmon, mackerel, sardines, walnuts, flaxseeds, chia seeds.

B vitamins play an important role in converting carbohydrates, proteins and fats into energy your body can use, which helps fuel follicle metabolism and rapid cellular activity required for new hair growth.
Good sources: Leafy greens, eggs, whole grains, salmon, dairy products including yogurt, milk, and cheese.

Keep Cortisol In Check

Rapid weight loss can raise your levels of cortisol, the hormone your body produces under stress, and chronically elevated cortisol can push hair follicles out of the growth phase and into the shedding phase. Over time, this can lead to thinning or a condition called telogen effluvium, when hair prematurely enters the resting phase and can lead to shedding.[10]

Working out regularly (walking, biking, swimming, dancing), journaling, breathing exercises and giving yourself daily downtime, whether it’s to meditate, read or do something you enjoy, can go a long way towards protecting your body and your hair against the effects of stress.

Prioritizing seven to nine hours of sleep is equally important; sleep deprivation is linked to elevated cortisol and disrupted hair cycles.[11] And stress management practices like meditation, deep breathing, or time outside can help regulate your nervous system.

How Targeted Peptide Support Can Help

The earlier you start supporting your follicles, the better positioned you are to protect the hair you have and strengthen the hair that’s growing.

OMI’s Hair Growth Peptide Nourish formula is the first peptide specifically formulated to address GLP-1-related hair loss and thinning. It works through two targeted mechanisms:

IFP-131™ Hair Growth Peptides restore peptides at the follicle level, anchoring and strengthening each strand from within. Rapid weight loss depletes the peptides your follicles depend on; Nourish directly replenishes them, supporting the structural conditions healthy hair growth requires.

AnaGain™ Pea Protein Extract helps activate and extends the anagen (active growth) phase of the hair cycle while shortening the shedding phase. It also supports healthy follicle function and nutrient absorption, addressing the root cause rather than just the symptom.

The Takeaway

Hair thinning on a GLP-1 is real, but there’s a lot you can do about it because the shedding is driven by nutritional depletion and metabolic stress rather than the medication itself. Prioritize protein, fill the nutrient gaps, manage cortisol, and give your follicles targeted support from the inside out. The earlier you start, the better your hair will be positioned to weather the transition.

Frequently Asked Questions

How long does GLP-1-related hair shedding last?

Once weight stabilizes and nutrition improves, the hair cycle typically normalizes within a few months. Keep in mind that hair growth is slow; even after the trigger resolves, visible regrowth takes time. If shedding continues beyond six months or seems to be getting worse rather than better, it's worth talking to a dermatologist to rule out other contributing factors.

Can eating more protein actually make a difference for my hair?

Yes, what you eat has an impact on your hair. Hair is made primarily of keratin, a structural protein, and your body needs a steady supply of specific amino acids to build it. When protein intake drops, which can easily happen on a GLP-1, your body doesn't have the raw materials to produce strong, healthy strands. Hitting your protein targets consistently, even when your appetite is suppressed, is one of the most direct ways to protect your hair during weight loss.

When should I consider taking OMI Nourish if I'm on a GLP-1?

Talk to your doctor, but because telogen effluvium typically appears two to three months after the triggering event, getting ahead of it can give your follicles the structural support they need before depletion sets in. If you're already noticing shedding, it's not too late: Nourish works to replenish peptides at the follicle level and support the conditions for regrowth, no matter where you are in the process.