Which multivitamin is best while taking Wegovy?

Why does Wegovy make micronutrient gaps more likely?

Semaglutide slows gastric emptying and reduces appetite, which is how it produces weight loss. Most people on Wegovy eat noticeably less within the first few weeks, sometimes significantly less by the time they reach the higher maintenance doses. The problem is that vitamins and minerals arrive in food. Cut the food, and you cut the delivery mechanism too.

There is a common assumption that a well-balanced diet makes supplements unnecessary. For most healthy adults at normal eating volumes, that is broadly true. On Wegovy, though, "normal eating volumes" no longer apply. If someone moves from 2,000 calories a day to 1,200, the proportional micronutrient shortfall is real, even if every meal is nutritious. The NHS advises that people using weight-management medicines should pay attention to diet quality alongside any reduction in quantity, a point covered in the NHS semaglutide medicines page.

The nutrients most consistently identified as at risk during significant caloric restriction are vitamin D (because it relies partly on dietary fat for absorption, and fat is often one of the first things people cut), vitamin B12 (concentrated in meat and dairy), iron, folate, calcium and zinc. None of this means deficiency is inevitable, it means a daily multivitamin is a low-effort, low-cost precaution that most prescribers consider sensible. You can read more about the broader picture on which vitamins are most relevant during Wegovy treatment.

What should a multivitamin for someone on Wegovy actually contain?

Not all multivitamins are equal, and the label can obscure as much as it reveals. The most useful formula for someone using Wegovy will include at minimum: vitamin D3 (10–25 micrograms is the standard UK recommended range; many people in the UK are already deficient before starting treatment), vitamin B12, iron (especially relevant for women of reproductive age), folate or methylfolate, calcium or a calcium citrate form (citrate absorbs well without food, which matters when meals are small), and zinc.

Vitamin D specifically deserves attention. The UK government recommends that all adults consider a daily 10-microgram supplement throughout autumn and winter; on Wegovy, where dietary fat and food volume are both reduced, year-round supplementation is worth discussing with your prescriber. How vitamin D interacts with Wegovy treatment covers this in more depth.

Formulations matter too. High-dose iron supplements taken on an empty stomach can worsen nausea, an issue when GI symptoms are already common early in treatment. A food-state or gentle-iron formula is usually easier to tolerate. Similarly, large single-tablet formats that are hard to swallow may be a problem if nausea is present. Softgels and chewables are reasonable alternatives. For women specifically, there are formulas worth comparing that weight the iron and folate content appropriately.

Are there supplements you should avoid or watch carefully?

Fat-soluble vitamins (A, D, E and K) accumulate in the body rather than being excreted daily. Because Wegovy reduces dietary fat intake, absorption of fat-soluble vitamins can change. This cuts both ways: you may absorb less from food, but very high-dose supplements of A or E can still build up over time. Standard multivitamin doses are not a concern; very high-dose single-nutrient supplements of fat-soluble vitamins are worth checking with your prescriber before adding.

There is also no benefit to doubling up. A comprehensive multivitamin plus separate high-dose individual vitamins on top is not twice as effective. It increases the chance of reaching tolerable upper intake levels for certain nutrients, particularly vitamin A and niacin, without any additional benefit.

Protein is not a vitamin, but it is worth mentioning here because it is the nutrient people on Wegovy are most likely to under-consume once appetite drops. Lean muscle is preserved better when protein intake stays adequate even as total calories fall. Discussing a protein target with your prescriber or a dietitian is sensible alongside any conversation about supplements. Our guide for people finding progress on Wegovy slower than expected touches on how diet composition affects outcomes.

How does this fit into the wider cost of Wegovy treatment?

A decent daily multivitamin costs relatively little, a few pounds a month from a pharmacy or supermarket. In the context of private Wegovy treatment, it is a small addition. If you are weighing up the overall cost of treatment, our overview of what Wegovy typically costs in the UK sets out what goes into a realistic monthly figure, including what a responsible provider includes in its pricing beyond the pen itself.

Wegovy is a prescription-only medicine. It requires clinical assessment before it can be prescribed, and the right supplement support is part of that clinical conversation. At nume, every treatment request is reviewed personally by a GPhC-registered prescriber, a real clinician, not an automated system. If you have questions about nutrition alongside treatment, that is exactly the kind of detail our prescribers are there to help with. Our Wegovy overview explains how semaglutide works and what the treatment involves from the start.