Currently, there’s no direct evidence that shows retatrutide causes hair loss. However, this weight loss drug is still in clinical testing, so the results aren’t yet conclusive. And because hair loss has been associated with other weight loss drugs, it’s possible retatrutide may be linked with hair loss.
Although research into GLP-1 medications and alopecia is ongoing, shedding is likely the result of rapid weight loss, rather than the drugs themselves. Most cases are temporary and can be managed through good nutrition, patience, and supportive medical advice.
Learn whether retatrutide is linked to hair loss, and why rapid weight loss from retatrutide and similar drugs can trigger temporary shedding. You’ll also discover how to reduce the risk of hair loss when using retatrutide, when to seek medical advice, and which treatments can help encourage healthy hair regrowth after weight loss.
Key takeaways
There is currently no direct evidence that retatrutide causes hair loss, although research is still ongoing because the drug remains investigational.
Hair shedding during retatrutide treatment is more likely to be caused by rapid weight loss triggering telogen effluvium than by the medication itself.
Eating enough protein, maintaining a nutrient-rich diet, and staying hydrated can help support healthy hair while losing weight.
Don’t stop taking prescribed retatrutide without medical advice. Speak to your prescribing clinician if you notice hair loss, as they can investigate other possible causes and recommend appropriate treatment.
If your hair loss persists longer than expected, worsens, or doesn’t improve on its own, the Wimpole Clinic’s expert trichologists can assess the underlying cause and recommend personalised hair restoration treatments.
Clinical studies have primarily focused on retatrutide’s effectiveness for weight loss and metabolic health, with one phase III study finding retatrutide could reduce weight by 30% over 2 years [1]. And so far, hair loss hasn’t emerged as an obvious side effect or safety concern in retatrutide studies. So there’s no evidence — yet — that retatrutide directly causes hair loss.
Some people who lose weight with medications like retatrutide do notice increased hair shedding during their treatment. In most cases, this is thought to be related to rapid weight loss rather than the medication itself, although some research has emerged linking GLP-1 agonists more broadly to alopecia [2-3].
Several factors have fuelled speculation about a link between retatrutide and hair loss. Firstly, GLP-1 agonists like semaglutide (Ozempic/Wegovy) and tirzepatide (Mounjaro) have long been linked with hair loss [4-5]. Although retatrutide hasn’t yet been licensed, it may be grouped together with these medications in conversations about side effects.
Importantly, temporary hair shedding after significant weight loss has been recognised for many years [6]. Weight loss surgery can lead to hair loss, as can crash dieting and even intermittent fasting [6]. So it’s possible that rapid weight loss itself triggers hair shedding, rather than retatrutide or other weight loss drugs.
But emerging evidence suggests that hair loss may actually be a true side effect of weight loss drugs like retatrutide [2-3]. A 2026 study found that participants using GLP-1 agonists to treat type 2 diabetes (rather than to encourage weight loss directly) were more likely to experience hair loss than those using other treatments [3].
Researchers acknowledged that rapid weight loss may still have been the underlying cause, but more studies are needed to establish the true relationship between GLP-1 agonists and hair loss.
Hair shedding from fast weight loss is known as telogen effluvium, and it mostly happens because of restricted food intake. When calorie intake is low, your body directs energy to your vital functions. That means non-essential functions like hair growth can suffer, and may explain why hair regeneration stops during periods of intermittent fasting [7].
Additionally, following diets that limit specific food groups can lead to nutritional deficiencies, which may affect hair growth. These types of deficiencies are rare in the developed world, but can happen on extremely restrictive diets that lead to rapid weight loss.
So whether your calorie intake is low due to your chosen diet, weight loss surgery, or appetite suppressants like retatrutide, it can culminate in the same effect: visible excessive hair shedding.
Slow but steady weight loss is the most effective way to lose weight without impacting your hair. This isn’t always possible when you’re taking retatrutide and similar weight loss drugs, as they can suppress your appetite sharply, making it uncomfortable to decrease your food intake more slowly.
In these cases, it’s a good idea to focus on what you’re eating rather than the amount. This is also helpful for forming a long-term, sustainable approach to healthy weight maintenance. When planning meals or choosing food, try to:
Additionally, don’t overrely on vitamin supplements to boost hair growth unless you’ve been specifically recommended to use them by a doctor. There’s limited proof they help with hair growth (unless you have a clinical nutritional deficiency).
These tips will help you continue losing weight without compromising on hair growth.
No — if you’ve been prescribed retatrutide (or any other weight loss drug) it’s because your doctor believes you can benefit from it clinically. So you shouldn’t stop retatrutide suddenly, even if you suspect it may be causing your hair to fall out.
For one thing, telogen effluvium is often temporary, and may resolve itself as your body adapts to its new routine. For another, it’s never a good idea to stop a prescribed medication without medical advice.
Speak to your prescribing clinician before making any changes. They can help determine whether your hair loss is likely to be related to rapid weight loss, the drug itself, or whether another cause needs investigating.
If your hair has already started falling out, try not to worry — telogen effluvium is almost always temporary, and will resolve itself once the underlying cause is resolved [8].
In this case, that doesn’t mean you need to revert to previous eating habits. It just means you need to give your body time to adapt to its reduced food intake, which should happen as long as you’re still getting enough calories to allow for hair growth — especially if you’re eating plenty of protein and nutrient-rich foods.
But there are some ways to give your follicles a little extra help:
All these strategies can help, but none will work instantly. Hair regrowth takes at least 3-6 months to start, and longer to grow to your desired length. So you’ll need to be patient while your hair grows back.
Yes, it’s important to tell your doctor about any concerning side effects, including hair loss. They may be able to amend your retatrutide dose or switch to an alternative weight loss drug (although there are no guarantees you won’t experience hair loss on these as well).
They can also check for other underlying causes of hair loss, such as illness, nutritional deficiencies, or autoimmune conditions. Alopecia areata, an autoimmune disease that causes hair loss, has been linked with semaglutide [11].
While retatrutide isn’t yet licensed for weight loss, it has shown very promising results in clinical trials [12]. So it could be made available in the next few years. If you start experiencing hair loss while using retatrutide, here’s what to do:
There’s no evidence yet to suggest that retatrutide carries a higher or lower risk of hair loss compared with other weight loss drugs. However, one study has shown that Mounjaro users were more likely to experience hair loss compared with those using Ozempic, Saxenda, or Victoza [14].
Researchers suggested this may be because of Mounjaro’s more significant weight‐reducing effects [14]. Retatrutide is a triple receptor agonist, whereas Mounjaro is a dual receptor agonist. So if this logic holds, you may be more likely to experience hair loss on retatrutide compared with other drugs, thanks to its potent weight loss impact.
Let’s compare the quality and amount of evidence for retatrutide, semaglutide, and tirzepatide to see which is right for you:
Although there’s no evidence linking retatrutide to hair loss, this is most likely because it’s an investigational drug. It hasn’t yet completed clinical trials or been licensed for widespread public use, so future research into the link between retatrutide and hair loss is required.
If you’re worried about your hair falling out when using any kind of weight loss medication, including retatrutide, it’s best to speak to your GP first. They can assess your symptoms, order tests to check for other potential causes, and amend your prescription if necessary.
If your hair is taking longer than expected to grow back — or you have other hair loss concerns — speak to a private trichology clinic. The Wimpole Clinic’s trichology team is fully qualified, and can explore many different hair restoration options with you, based on your individual symptoms and goals.
Book a consultation at your nearest Wimpole Clinic location and meet our friendly, professional trichologists to start your hair restoration journey.
Find out more about retatrutide and hair loss in these frequently asked questions.
There’s no evidence to show that retatrutide directly causes hair loss. But by triggering rapid weight loss, this drug may indirectly lead to temporary hair shedding.
Hair loss from retatrutide use (and other weight loss drugs) is normally temporary. It will grow back as your body adapts to your new diet, as long as you’re eating enough to support your body’s hair growth function.
That said, some studies have shown that weight loss drugs can worsen androgenetic alopecia (also known as pattern baldness) [15]. Pattern baldness is permanent and irreversible without treatment.
Telogen effluvium normally causes visible symptoms around 2-3 months after the triggering event (in this case, starting retatrutide treatment).
It’s not always possible to avoid hair loss when taking retatrutide, but eating nutritionally-dense foods — even when your appetite is lower than before — can help maintain your hair.
Treatments like minoxidil and caffeine shampoo can also help manage the symptoms of telogen effluvium, so these may be useful therapies. A trichologist can advise on which hair loss treatments are most likely to work for you as an individual.
Not yet. Retatrutide is still undergoing clinical trials, and a licensing date is yet to be published in the UK.
Wimpole Clinic Services:
Hair Transplants, Beard Transplants & Eyebrow Transplants.
Talk to a specialist
Dr Hafsa Farah Mohamed (GMC: 7998061) is a hair restoration surgeon specialising in FUE hair transplantation, including advanced scalp, beard, and eyebrow restoration. She is committed to delivering natural, life-enhancing results that are meticulously designed around each patient’s facial structure, hair characteristics, and aesthetic goals.
Dr Mohamed trained under pioneering hair transplant surgeon Dr Michael May at the prestigious Wimpole Clinic, where she refined her surgical technique and developed a sophisticated understanding of the art and science of hair restoration. Her work combines technical precision with aesthetic judgement to create results that are seamless, balanced, and undetectable.
She earned her MD and Diploma of Licence in Medicine (Integrated Bachelor’s and Master’s Degrees) from Nicolae Testemițanu State University of Medicine and Pharmacy. She has applied this extensive medical training directly to her surgical practice, ensuring every procedure is grounded in clinical excellence and tailored planning.
Dr Hafsa Mohamed has treated a broad range of patients, including high-profile individuals and those presenting with extensive or atypical hair loss patterns. Her experience with complex cases has strengthened her ability to design highly customised treatment strategies for scalp density restoration, beard reconstruction, and eyebrow refinement.
She is particularly passionate about the transformative impact of facial hair restoration. Whether reconstructing a patchy beard, redesigning eyebrow shape, or restoring scalp density, Dr Hafsa Mohamed works collaboratively with each patient from consultation through to post-operative care. Her approach is supportive, transparent, and detail-driven at every stage.
Dr Mohamed’s philosophy centres on precision, artistry, and individualisation. She believes exceptional outcomes are achieved not only through surgical expertise, but through understanding each patient’s unique identity, proportions, and aspirations.
