Vitamins to Take When on Mounjaro

Because tirzepatide can significantly reduce how much you eat, a few nutrients deserve particular attention. None of the following replaces a conversation with your prescriber or a registered dietitian — they can review your individual diet and, where appropriate, recommend blood tests — but these are the areas commonly flagged by nutrition professionals for people eating less overall.

Vitamin D

Vitamin D supports bone strength, immune function, and mood. Many people are already low in vitamin D, particularly in regions with limited sunlight, and eating less food only narrows the margin further. A daily supplement is widely considered sensible by health authorities for many adults regardless of diet — your prescriber can advise on an appropriate amount for you.

B vitamins, especially B12

B vitamins — particularly B12, B6, and folate — play a central role in energy metabolism and nerve health. B12 is found mainly in animal products, so people eating smaller portions of meat, fish, eggs, or dairy may benefit from paying attention to their intake. A general B-complex supplement is one option worth discussing with your prescriber.

Iron

Reduced intake of red meat and leafy greens can mean iron slips. Low iron is associated with fatigue and poor concentration — symptoms that can easily be confused with other aspects of being on a GLP-1 medicine. A blood test is the most reliable way to know whether iron supplementation is right for you.

Calcium and magnesium

If dairy or high-fibre foods feature less in your diet, calcium and magnesium intake can dip. Both support bone density and muscle function. Getting enough calcium from food sources (such as fortified plant milks, tinned fish with bones, or dairy) is preferable, but a supplement may be appropriate if your intake is consistently low.

Zinc

Zinc supports immune function and wound healing and is found in meat, shellfish, legumes, and seeds. Lower overall food intake can reduce zinc intake, so it is worth including zinc-rich foods in your meals where possible.

For practical guidance on eating well on Mounjaro, see eating well on Mounjaro and vitamins on Mounjaro: a closer look. It is also worth reading about vitamins that may not combine well with Mounjaro before starting any supplement.

One of the easiest ways to spot a nutritional gap is to track what you are actually eating — and that is where GLP Trackr's AI food photo scan earns its keep. Point your camera at a meal and the app instantly estimates calories, protein, and macros, no manual entry needed. Over days and weeks, those logs build a clear picture of whether your intake is consistently covering the nutrients you care about.

Alongside food logging, the app's daily check-in lets you note energy levels, mood, and how you are feeling each morning. If you start a new supplement and want to watch whether your energy or general wellbeing shifts over time, having that data in one place makes patterns easier to spot — and easier to bring to a conversation with your prescriber or dietitian.

For a broader view of how nutrition fits into your overall journey, the calorie deficit and GLP-1 guide is worth exploring alongside your supplement plan.

Always follow the guidance of your prescriber or doctor before starting any supplement, especially if you take other medications or have an existing health condition — they know your full picture and can recommend the right approach for you.

Ready to bring your food and nutrition tracking together in one place? GLP Trackr is available free on the App Store and Google Play, with a 7-day trial to get started — just snap a photo of your next meal and let the app do the rest.