What Supplements Should You Take While on Mounjaro?

When food intake drops, overall nutrient variety often narrows too. These are the areas most commonly flagged by healthcare professionals when calorie intake is lower than usual:

Vitamin D and calcium

Both are important for bone health and immune function, and both can fall short when total food volume decreases. Many people are already low in vitamin D before starting a GLP-1 medicine, so it is worth asking your prescriber or doctor about checking your levels.

B vitamins, including B12

Vitamin B12 is found mainly in animal proteins — meat, fish, dairy, and eggs. If nausea on Mounjaro makes these foods harder to eat, or if you are reducing portions significantly, B12 and other B vitamins may be worth considering. Fatigue is a commonly reported symptom on GLP-1 medicines, and low B12 can compound this.

Magnesium

Magnesium supports hundreds of processes in the body, including energy metabolism and sleep quality. It is found in nuts, seeds, wholegrains, and leafy greens — foods that may feature less frequently when appetite is low. Some people also experience gastrointestinal changes on Mounjaro that may affect absorption.

Protein — technically a macronutrient, not a supplement

Protein deserves a mention here because inadequate protein intake during weight loss is one of the most common nutritional concerns on GLP-1 medicines. If whole-food protein sources are difficult to manage due to reduced appetite, a protein supplement such as a shake or powder can be a practical bridge. Getting enough protein supports muscle preservation during weight loss — an important factor that your prescriber may already have discussed with you.

A broad-spectrum multivitamin

When eating less overall, a good-quality multivitamin can act as a nutritional safety net. It will not replace a balanced diet, but it can help cover gaps on lower-calorie days. For more detail on what to look for in one, see our guide to choosing a multivitamin while on Mounjaro.

For a broader look at supplements often discussed alongside tirzepatide, the page on Mounjaro and supplements covers additional considerations worth reading. You may also find the related guide on which supplements to take with Mounjaro useful for a more detailed breakdown.

Important: always discuss any supplement with your prescriber or doctor before starting — some can interact with medicines or underlying conditions. This information is general and educational, not a personal recommendation.

Keeping track of what you are actually eating — and where the gaps might be — is much easier when you have a clear picture of your daily intake. GLP Trackr's AI food photo scanner lets you point your camera at a meal and get an instant nutrition breakdown, including protein, calories, and macros, without having to weigh or manually search every ingredient. On days when appetite is low and meals are small, it takes seconds rather than minutes.

Beyond logging individual meals, GLP Trackr lets you set a daily protein target so you can see at a glance whether you are hitting the level that supports muscle preservation during weight loss. Pair this with the calorie and fibre targets, and you have a practical picture of whether your reduced appetite is leaving any key nutritional gaps — useful context to bring to your next prescriber appointment alongside any questions about supplementation.

Understanding how your food intake relates to your energy, mood, and progress is also part of what the app's insights feature surfaces over time. If you are also thinking about your overall calorie approach, our guide to calorie deficit on a GLP-1 journey is a helpful place to start.

GLP Trackr is a tracking and journaling tool — it does not replace the guidance of your prescriber or doctor, and any decisions about supplements or nutrition should be made with their input, particularly if you have any underlying health conditions.

Ready to get a clearer picture of your daily nutrition? Download GLP Trackr on the App Store or Google Play and start your free 7-day trial — snap a photo of your next meal and see your protein and calories logged in seconds.