Should You Take a Multivitamin on Mounjaro?

One of the most commonly reported effects of tirzepatide (the active substance in Mounjaro) is a noticeable reduction in appetite and what many users describe as quieter "food noise". Eating less is often the goal, but smaller portion sizes can mean lower intakes of key micronutrients — vitamins and minerals your body still needs in the same amounts as before.

Nutrients that can fall short on a lower-calorie diet

When daily food intake drops, certain nutrients tend to be the first to slip below recommended levels. These commonly include:

• Iron — particularly relevant for people who menstruate, as red meat and fortified foods may be eaten less frequently
• Vitamin D — already low in many people regardless of diet; dietary sources are limited
• B vitamins (including B12 and folate) — found mainly in meat, dairy, eggs, and fortified foods that may be eaten in smaller quantities
• Calcium — if dairy intake reduces alongside overall food volume
• Zinc and magnesium — often under-consumed even on normal diets

Does Mounjaro itself deplete vitamins?

Mounjaro does not directly deplete micronutrients. The concern is indirect: eating considerably less food over weeks and months simply provides fewer opportunities to hit daily nutritional targets through diet alone. This is a general consideration for anyone in a sustained calorie deficit, not a specific effect of tirzepatide.

If you want to understand more about which vitamins are commonly discussed by people on Mounjaro, or explore guidance on choosing a multivitamin suited to a Mounjaro journey, those pages go into more specific detail. If you are a woman and want tailored information, there is also a guide to multivitamins for women on Mounjaro worth reading.

As always, your prescriber or doctor is the right person to advise whether a supplement is appropriate for you, and a blood test can reveal whether any specific deficiencies need addressing.

Knowing whether you are hitting your nutritional targets day to day is much easier when you can actually see your intake — and that is where GLP Trackr's food logging tools make a real difference.

The app's AI photo scan lets you point your camera at a meal and get an instant breakdown of calories, protein, and macros without manual searching or weighing. On days when appetite is low and meals are small, this makes logging effortless rather than another task on the list.

You can also set daily targets for protein, calories, fibre, and water — useful reference points to check whether your reduced intake is still covering the basics. If you notice you are consistently falling short on key food groups, that is valuable information to bring to your prescriber or doctor.

For broader guidance on managing your calorie and nutrient balance on a GLP-1 journey, the calorie deficit guide covers how to approach energy intake in a way that supports your progress.

GLP Trackr is free to try for 7 days — available now on the App Store and Google Play. Start logging your meals and see your nutritional patterns clearly from day one.