Which supplements to take with Wegovy — and how to decide

Why Wegovy changes your nutritional picture

Semaglutide slows gastric emptying and reduces how much you want to eat. That is largely the point. But when total food intake falls by a meaningful amount, so does the total volume of vitamins and minerals coming through your diet. Most people starting Wegovy are eating noticeably less within the first month, and some find certain foods (particularly dense proteins like meat and eggs) harder to tolerate early on.

The nutrients most commonly affected are protein, vitamin D, vitamin B12, iron and calcium. Protein matters more than any other macronutrient during weight loss because it helps preserve lean muscle mass. Losing muscle alongside fat is the outcome worth working to avoid. Clinical guidance for people on GLP-1 medicines consistently points to a protein target of at least 1.2 grams per kilogram of body weight daily, though your prescriber may set a different figure based on your specific situation. You can read more about how the medicine itself works on the Wegovy treatment overview.

Vitamin D deficiency is already widespread in the UK population regardless of any medicine, partly because sunlight exposure is limited for much of the year. When overall food variety narrows, the shortfall can deepen. The NHS semaglutide guidance does not prescribe a supplement list but does emphasise following a balanced reduced-calorie diet, in practice, that often means some supplementation for people whose intake has dropped.

The supplements most people on Wegovy consider

A good-quality multivitamin is often the practical starting point, not because it resolves every gap, but because it covers several minor shortfalls without requiring a cupboard of separate pills. Look for one that includes vitamin D3, B12, folate and zinc. Some people find a multivitamin easier to keep up with: a habit attached to something already in the routine, like the kettle going on in the morning, is one less decision each day.

Protein supplements (typically a powder added to a smoothie or yoghurt) are worth considering if you are consistently falling short of your daily protein target through food. Whey, casein and plant-based blends all have their place; the key variable is that you actually consume it regularly, not which brand you choose.

Iron and B12 deserve attention if your diet was already low in red meat, fish or dairy before starting Wegovy, or if you are following a vegetarian or vegan diet. B12 in particular is found almost exclusively in animal products. A blood test is the only way to know whether you genuinely need to supplement either of these, symptoms like tiredness and brain fog overlap with many other causes. The iron supplements and Wegovy page covers that specific question in more depth.

Omega-3 fatty acids from fish oil are a popular addition during weight loss generally. The evidence for them specifically in the context of GLP-1 medicines is limited, but their general safety profile is well established and they are widely used alongside dietary programmes.

What to be cautious about, and supplements to time carefully

Not every supplement is straightforwardly safe to add alongside a prescription medicine. Some interact with absorption; others have contraindications worth knowing about. The full picture of what to avoid or space out is covered on the supplements not to take with semaglutide page.

A few practical points for timing. Fat-soluble vitamins (A, D, E and K) need dietary fat to be absorbed properly, so taking them alongside a meal that contains at least some fat makes a difference. Calcium and iron compete for the same absorption pathway, so separating them by a couple of hours is standard advice. Caffeine can also reduce iron absorption if taken at the same time.

High-dose single-nutrient supplements are worth treating with the same scepticism you would apply to any medicine. Vitamin A toxicity is a real risk at sustained high doses; fat-soluble vitamins accumulate rather than being excreted. If you are already taking a multivitamin and adding separate high-dose vitamins on top, it is worth checking with a pharmacist or your prescriber that the combined dose is reasonable.

For a broader view of how supplement choices fit into the overall picture of being on Wegovy, the supplements guide for semaglutide users brings together practical recommendations across the full treatment period. If you have also come across semaglutide peptide being sold online and want to understand whether semaglutide peptide is the same as Ozempic, that page explains the important distinctions. Cost and access questions about Wegovy itself are covered on the Wegovy prices page if that is useful context.

Getting the right guidance for your situation

The honest answer is that supplement decisions are individual. Someone eating a varied diet with good protein intake and normal vitamin D levels in summer needs a different approach from someone who has cut most of their food groups out or whose bloodwork already showed deficiencies before starting treatment.

The most useful steps are: ask your GP or prescriber for a blood panel before you start or shortly after (if they are monitoring you), bring your current supplement list to any clinical review, and treat the list of supplements on Wegovy as a living decision rather than a one-time choice. As your dose increases, appetite often drops further, so the nutritional picture at 2.4mg may look different from the one at 0.5mg.

Our prescribers discuss diet, protein intake and nutritional support as part of the Wegovy consultation process. If you have not started treatment yet and want to understand whether Wegovy is clinically suitable for you, check your eligibility through a free consultation. For questions about ongoing aftercare, the FAQs page covers common queries. And if you would like to speak to someone directly, the contact page will reach our team seven days a week.