Vitamins and Supplements on Mounjaro: What Many People Consider

Mounjaro works partly by reducing appetite and slowing gastric emptying, which means many people eat noticeably smaller portions. While that supports weight loss, it can also mean consuming less of the micronutrients your body needs day to day — things like vitamin D, vitamin B12, iron, magnesium, and calcium that typically come from a varied, generous diet.

Nutrients commonly worth paying attention to

• Vitamin D and calcium: Smaller food intake can reduce both, and vitamin D is already under-consumed in many populations regardless of medication use.
• Vitamin B12: Found primarily in animal products; those eating less meat, fish, eggs, or dairy may find their intake falls. B12 is involved in energy production and nerve function, so keeping levels up is broadly sensible.
• Iron: Particularly relevant for people who menstruate or who were already borderline low before starting treatment.
• Magnesium: Involved in hundreds of metabolic processes; common in nuts, seeds, and wholegrains — foods that can get crowded out when portions shrink.
• Protein: Not a vitamin, but worth treating as a priority nutrient. Adequate protein helps preserve muscle mass during weight loss, and many people on Mounjaro find hitting their protein targets genuinely challenging when appetite is low.

A note on anti-nausea approaches

Some people search for anti-sickness tablets to manage nausea that can occur — particularly around dose changes. Any decision about taking anti-nausea medication alongside Mounjaro should be discussed with your prescriber or doctor rather than self-managed, as they can advise on what is appropriate for you specifically.

For more on building a sustainable eating pattern around Mounjaro, see our guide to eating well on Mounjaro, and explore choosing a multivitamin while on Mounjaro or our broader look at supplements commonly considered on GLP-1 medication. If you are also thinking about your overall calorie picture, the calorie deficit guide covers that in detail.

Keeping track of what you are actually eating — and whether you are hitting key targets like protein, calories, and fibre — is much easier when logging is genuinely effortless. GLP Trackr's AI food photo scan lets you point your camera at a meal and get an instant nutrition breakdown, which is particularly useful when appetite is low and meals are small and varied.

Beyond food logging, you can set a daily protein target and see at a glance whether you are hitting it consistently — one of the most useful habits on a GLP-1 journey. The side-effect tracker also lets you log how you are feeling day to day, including energy levels and fatigue, which can be worth monitoring and sharing with your prescriber if you are concerned about nutrient intake over time.

GLP Trackr is a tracking tool, not a medical service — it helps you build a clear picture of your journey to discuss with your healthcare professional, but it does not replace their advice. If you have specific concerns about deficiencies or supplementation, always bring them to your prescriber or doctor, who can arrange appropriate testing and guidance.

Ready to make food tracking on Mounjaro genuinely simple? GLP Trackr is free to try for 7 days — available now on the App Store and Google Play.