Guide
Supplements and nutrition while taking weight-loss injections
This page covers nutrition and supplement considerations for people taking GLP-1 weight-loss medication such as Wegovy or Mounjaro; it is not a review of the medications themselves. The core message is that appetite suppression can make it harder to meet protein and micronutrient needs, so getting enough protein and staying active matters alongside these medications. Always check any supplement, and any concern about your diet, with your prescriber or pharmacist first.
What this page covers
This page is about nutrition and supplement considerations for people who are already taking a GLP-1 weight-loss medication, such as Wegovy, Mounjaro, Ozempic used off-label for weight loss, or Saxenda. It does not review, compare or recommend the medications themselves, it does not give dosing advice, and it does not tell you where to get a prescription. It is information, not medical advice, and it is not a substitute for your prescriber's guidance. If you have questions about the medication itself, its dose, or your prescription, those are questions for your prescriber or pharmacist, not for this page.
Why nutrition needs more attention on these medications
GLP-1 medications work by significantly suppressing appetite, and that reduced food intake is widely reported as a common and cautious clinical concern: eating less overall can make it harder to meet protein and micronutrient needs from food alone. Rapid weight loss, on any regimen, can include some loss of lean muscle mass alongside fat loss, not just fat. This is why maintaining adequate protein intake and resistance-type activity, as advised by a prescriber or dietitian, is commonly recommended alongside these medications. It is a reason to pay closer attention to what you are eating, not a reason to add supplements without checking first.
Nutrients worth paying attention to
When appetite and food variety drop sharply, nutrients that are easy to under-eat include protein, B vitamins, iron, vitamin D and calcium. This is a general pattern that applies whenever someone is eating significantly less and a narrower range of food, not a claim that these medications deplete any specific nutrient by a defined mechanism. It is a reason to think about the quality and spread of what you are eating in smaller meals, for example prioritising a protein source and a variety of food groups where you can, and to raise any concern about your intake with your prescriber or a dietitian rather than guessing at a fix.
How common these medications are
These medications have become common in the UK. NHSBSA, the body that publishes prescribing data for the NHS in England, makes open data available on how many Wegovy and Mounjaro items are dispensed each month, via its Open Data Portal (dataset FOI-03421, at opendata.nhsbsa.net/dataset/foi-03421). We mention this simply as evidence of how widespread these medications now are, not as a reason to start or change treatment.
Read more
- Upper safe limit checker for supplement nutrients.
- Recommended daily intake lookup for UK reference values.
- Our full tools directory.
Frequently asked questions
Do I need to take supplements on Wegovy or Mounjaro?
Not automatically. There is no blanket rule that everyone on a GLP-1 medication needs supplements. But because these medications reduce appetite and food intake significantly, some people find it harder to get enough protein and certain nutrients from food alone, which is why it is worth discussing your diet, and whether any supplement is appropriate for you, with your prescriber or a dietitian rather than guessing.
Why am I losing my hair on a weight-loss injection?
Hair thinning is a commonly reported concern during rapid weight loss, whatever method is used to lose it, and it is often linked to the stress the body is under during fast weight change rather than the medication itself acting on hair directly. It is worth raising with your prescriber rather than self-treating with supplements, so they can check there is nothing else going on and advise what, if anything, is appropriate for you.
Can I take my normal multivitamin on a GLP-1 medication?
Possibly, but do not assume it without checking. Appetite and absorption can change on these medications, and the medication's own guidance may affect what is appropriate to take alongside it, so tell your prescriber or pharmacist about any supplement you are taking or considering, including a multivitamin you already use.
Where can I find out more about the medication itself?
This page covers nutrition and supplements only. We do not review, compare or advise on Wegovy, Mounjaro, Ozempic or Saxenda as medications, and we do not cover dosing or where to get a prescription. For anything about the medication itself, its dosing or your prescription, speak to your prescriber or pharmacist.
This is information, not medical advice, and is not a substitute for a registered clinician. If you are taking or considering a GLP-1 weight-loss medication, discuss your diet and any supplement with your prescriber or pharmacist.
We sell this in our store
Advanced 100% Whey Protein Isolate (Chocolate)
If protein is genuinely hard to reach through food alone, as discussed above, a protein supplement is one practical way to close the gap. Her Vitals' own Advanced 100% Whey Protein Isolate (Chocolate) provides 22 g of protein per two-scoop serving; Pure3 Whey Protein Isolate in Chocolate and Vanilla are also available. As with any supplement on a GLP-1 medication, check with your prescriber or pharmacist before adding it, particularly around timing with a reduced appetite.
Sold by us directly from our own Shopify store, disclosed here as our own product like any other. This is a live, direct sale, separate from the affiliate links elsewhere on this page, which are not wired in yet. It does not win our roundups or calculators automatically. Check our price against any other product with the cost-per-effective-dose calculator.
Editor, Her Vitals
Oliver leads Her Vitals's editorial coverage of women's life-stage health and supplements. He curates and reviews existing branded products across trying to conceive, pregnancy, postnatal, perimenopause, menopause and the senior years, weighing what the evidence supports against guidance from bodies such as EFSA, the NHS and NICE, and is clear that the content is information rather than medical advice.
Last reviewed: 4 August 2026
Reviewed by Oliver Mackman, Editor. Editorial review against published guidance; not a clinical review.