Which Vitamins To Take On Mounjaro?

If you’re using Mounjaro injections to help you lose weight, you may be wondering whether you need to take vitamins to support you. In this article, we’ll explain why supplementing with vitamins might be beneficial while on Mounjaro, which specific vitamins to consider and whether a daily multivitamin could help. We’ll also look at ways of recognising nutrient deficiencies, how to prevent them and the best methods for getting vitamins into your routine.

Key Takeaways

Here are the five biggest takeaways from this article about vitamins and Mounjaro:

• Mounjaro reduces appetite and food intake, which can lead to deficiencies in key nutrients like B vitamins, vitamin D, magnesium and iron.

• Essential nutrients to supplement or monitor while on Mounjaro include vitamins B, C, D, iron, potassium, calcium, zinc, magnesium, and protein.

• A diet rich in colourful fruits, vegetables, lean proteins, whole grains and healthy fats is crucial to prevent deficiencies.

• Regular checkups are vital to detect deficiencies early. Supplements, such as multivitamins, can help fill gaps, but they should be tailored to your needs with guidance from a healthcare provider.

• Staying well-hydrated supports nutrient absorption. Timing and separating specific supplements, such as iron and calcium, can optimise their effectiveness and avoid interactions.

Why Might You Need Vitamins on Mounjaro?

Mounjaro works by reducing appetite and changing how your body processes food. While this is great for weight loss, it can also mean you’re eating less of the essential nutrients your body needs.

Common reasons for nutrient deficiencies using Mounjaro:

✅ Reduced appetite: Eating less means fewer vitamins and minerals from food.
✅ Dietary changes: Some people may cut out entire food groups, limiting nutrient intake.
✅ Faster weight loss: Losing more than 1kg per week may deplete stored nutrients.
✅ Limited sun exposure: In the UK, low sunlight in winter can cause vitamin D deficiencies.

Essential Vitamins to Take on Mounjaro

1. Vitamin B12 – For Energy & Nerve Health

✅ Supports red blood cell production and brain function.
✅ Helps prevent fatigue, tingling sensations, and memory issues.
✅ Often low in plant-based diets, so vegans and vegetarians should supplement.

💊 Recommended Dose: 2.4mcg daily (higher for those over 50 or on plant-based diets).

🔎 Sources: Fish, meat, eggs, dairy, or B12 supplements.

2. Vitamin D – For Bone & Immune Health

✅ Supports bone health, immune function, and mood.
✅ Low intake can cause weak bones, frequent illnesses and depression.
✅ The UK’s lack of sunlight in winter makes vitamin D supplementation essential.

💊 Recommended Dose: 25mcg (1,000 IU) daily (more if overweight).

🔎 Sources: Sunlight, oily fish, fortified foods, or vitamin D supplements.

3. Calcium – For Strong Bones & Muscles

✅ Maintains bone strength, muscle function and heart health.
✅ Low intake can cause brittle bones, muscle cramps, and osteoporosis.
✅ Women, especially postmenopausal, are at higher risk of calcium deficiency.

💊 Recommended Dose: 1,000mg daily.

🔎 Sources: Dairy, leafy greens, almonds, or calcium supplements.

⚠ Tip: Take calcium separately from iron to improve absorption.

4. Iron – For Oxygen Transport & Energy

✅ Prevents anaemia, which causes fatigue, dizziness, and shortness of breath.
✅ Appetite suppression may reduce iron intake, especially in women.

💊 Recommended Dose: 8.7mg (men) | 14.8mg (women under 50) daily.

🔎 Sources: Red meat, spinach, lentils, or iron supplements.

⚠ Tip: Take with vitamin C (like orange juice) for better absorption. Avoid taking it with tea or coffee.

5. Magnesium – For Muscle & Nerve Function

✅ Supports over 300 biochemical reactions, including energy production, sleep and digestion.
✅ Low magnesium levels may cause muscle cramps, fatigue and irregular heartbeat.

💊 Recommended Dose: 310-320mg (women) | 400-420mg (men) daily.

🔎 Sources: Nuts, seeds, whole grains, or magnesium supplements.

⚠ Tip: Magnesium glycinate is best absorbed and is gentle on the stomach.

6. Zinc – For Immune & Metabolic Health

✅ Supports immune function, wound healing and metabolism.
✅ Helps prevent hair loss and skin problems.

💊 Recommended Dose: 8mg (women) | 11mg (men) daily.

🔎 Sources: Meat, shellfish, nuts, or zinc supplements.

⚠ Tip: Avoid taking zinc and iron together, as they compete for absorption.

7. Potassium – For Heart & Muscle Health

✅ Regulates blood pressure, nerve signals and muscle function.
✅ Low levels can cause muscle weakness, cramps and irregular heartbeat.

💊 Recommended Dose: 3,500mg daily.

🔎 Sources: Bananas, potatoes, beans, avocados, or potassium supplements.

⚠ Tip: If taking supplements, speak to your GP first—too much potassium can be harmful.

8. Protein – For Muscle Preservation & Recovery

✅ Essential for maintaining muscle mass during weight loss.
✅ Helps with healing, immune function and energy.

💊 Recommended Intake: 1.2-2.0g per kg of body weight daily.

🔎 Sources: Lean meats, fish, eggs, dairy, tofu, beans, or protein shakes.

⚠ Tip: Consider whey or plant-based protein supplements if your intake is too low.

How to Prevent Nutrient Deficiencies on Mounjaro

✅ 1. Maintain a Balanced Diet

• Prioritise whole foods rich in vitamins and minerals.

• Eat a variety of lean proteins, vegetables, whole grains and healthy fats.

✅ 2. Supplement When Necessary

• If you struggle to get enough nutrients from food, consider supplements.

• Speak to your GP before taking new vitamins.

✅ 3. Monitor Your Health

• Get regular blood tests to check vitamin levels.

• Watch for signs of deficiency, such as fatigue, weakness, or dizziness.

✅ 4. Stay Hydrated

• Drink at least 2 litres of water daily to aid digestion and nutrient absorption.

✅ 5. Talk to Your GP or Pharmacist

• If you have concerns about deficiencies, seek medical advice.

• Personalised blood tests and diet plans can help you stay healthy.

Signs of Vitamin Deficiency on Mounjaro

💡 Watch out for these warning signs:

⚠ If you experience any of these symptoms, consult your GP immediately.

What are the best ways to take vitamins when using Mounjaro?

Monitor your vitamin supplement intake with your doctor regularly

Before starting any supplements, it’s helpful to speak to your doctor to assess your nutrient levels, document any existing symptoms and review your current medications. Ongoing monitoring is also crucial, so scheduling follow-up tests every 3-6 months can help track your progress and adjust your vitamin intake as needed.

Consider what time to take them

When taking vitamins during Mounjaro treatment, it’s important to consider the best times for absorption and effectiveness. For energy support, B vitamins and vitamin C should be taken with breakfast to help your body absorb them more efficiently. It’s also a good idea to take these on a different day from your Mounjaro injection to avoid any potential interactions.

Iron supplements should be taken away from caffeine, as caffeine can interfere with iron absorption. Magnesium, which helps support sleep quality, is best taken in the evening, and fat-soluble vitamins like vitamin D should be taken with dinner, as dietary fat aids in their absorption.

Take different supplements separately to improve absorption

To improve absorption and maximise the effectiveness of your supplements while using Mounjaro, it’s important to take certain vitamins and minerals separately. For example, calcium and iron should be taken at least two hours apart or on different days as they can interfere with each other’s absorption. Similarly, zinc and iron should also be spaced out to avoid this interaction. 

On the other hand, combining vitamin C with iron can actually enhance the absorption of iron, so consider taking them together. By spacing out these specific supplements and combining others strategically, you can ensure your body absorbs them properly.

What are the common signs of a nutrient deficiency?

There are several signs to look out for if you think that you might have a nutrient deficiency while using Mounjaro, with different symptoms indicating different issues. Here is a handy table that outlines common nutrient deficiencies and their symptoms:

Vitamin B12 Deficiency

A vitamin B12 deficiency can lead to a range of symptoms, including rapid breathing or shortness of breath, headaches, indigestion and loss of appetite. Other common signs include palpitations, vision problems, weakness, fatigue and diarrhoea. You may also notice a sore or red tongue, sometimes alongside mouth ulcers. Cognitive changes such as memory problems, difficulty understanding and impaired judgement can also occur [1].

Vitamin C Deficiency

A deficiency in vitamin C, also known as scurvy, can cause several symptoms, including persistent fatigue, weakness and irritability. You may also experience joint, muscle, or leg pain, along with swollen, bleeding gums. Other common signs include the development of red or blue spots on the skin, typically on the legs and feet, though this may be less noticeable on darker skin tones. Bruising easily is another potential sign [2].

Vitamin D Deficiency

A deficiency in vitamin D can lead to serious bone-related issues. In children, it can cause bone deformities like rickets, while in adults, it may result in bone pain due to osteomalacia, a condition where bones become soft and weak. Vitamin D is crucial for calcium absorption and maintaining strong bones, so if you experience persistent bone pain, weakness, or any signs of bone deformities, it’s important to consult with your healthcare provider [3].

Iron Deficiency

Common symptoms of an iron deficiency include tiredness, a lack of energy and shortness of breath. You may also experience noticeable heartbeats (heart palpitations), paler-than-usual skin and frequent headaches. If you notice these signs, it’s important to consult with your healthcare provider, as iron plays a key role in oxygen transport and overall energy levels [4].

Potassium Deficiency

A potassium deficiency can lead to serious health issues, particularly around heart function. Symptoms of low potassium include muscle weakness, cramps and in more severe cases irregular heartbeats (arrhythmias). Potassium plays a vital role in regulating heart muscle activity, so a deficiency can lead to heart problems, including the risk of an irregular heartbeat [5].

Calcium Deficiency

Calcium deficiency can often go unnoticed until more severe symptoms develop, as the body draws calcium from bones to maintain vital functions like heartbeats and brain activity. One of the first signs may be an unexpected fracture or loss of a tooth, as your bones weaken. In some cases, a deficiency can lead to muscle spasms, tingling or burning sensations around the mouth and fingers, facial spasms, seizures and tremors. 

Other symptoms include difficulty swallowing, faintness, anxiety, low blood pressure, intestinal cramping and spinal or hip pain. Long-term calcium deficiency can also lead to brittle nails, hair, and even a reduction in height [6].

Zinc Deficiency

Zinc deficiency can lead to a variety of symptoms. Early signs may include anorexia, lethargy, and diarrhoea, as well as growth restriction or delayed bone maturation in children. A lack of zinc also impairs immune function, making you more susceptible to infections.

In more severe cases, zinc deficiency can cause delayed sexual maturation, impotence and damage to reproductive health, as well as skin issues such as alopecia (hair loss) and dermatitis.

Other symptoms include weight loss (which may be missed due to Mounjaro’s effects), issues with taste and smell, problems with healing and reduced iron absorption [7].

Magnesium Deficiency

Magnesium deficiency can lead to a range of symptoms including nausea, weakness and muscle twitching or cramping. In more severe cases, a deficiency can cause an irregular heartbeat. These symptoms occur because magnesium plays a key role in muscle function, nerve conduction and heart health [8].

Protein Deficiency

Protein deficiency can cause a variety of symptoms. Muscle weakness and loss are common as the body breaks down muscle tissue for energy. Early signs can include brittle hair and nails, as well as dry skin, rashes, or sores. Fatigue often develops due to decreased energy levels, while frequent infections may also occur because of a weakened immune system. 

In severe cases, symptoms can include stress fractures, fluid buildup in the stomach or lower limbs, itchy skin or jaundice. If you experience these symptoms, consulting your healthcare provider is crucial to assess your protein intake and prevent further health issues.

How can I prevent nutrient deficiencies on Mounjaro?

Use vitamins and supplements only where they're needed

To prevent nutrient deficiencies while on Mounjaro, it’s important to use vitamins and supplements to fill in gaps. Focus on nutrients that are commonly affected by Mounjaro use, such as vitamin B12, vitamin D and calcium, ensuring they are supplemented properly based on your needs. Rather than taking unnecessary supplements, consult with your doctor to tailor your approach to address specific deficiencies.

Aim to eat a balanced diet

Preventing nutrient deficiencies while on Mounjaro starts with eating a balanced diet. Prioritise whole foods that are naturally rich in vitamins and minerals, including a variety of colourful fruits and vegetables, lean proteins, whole grains and healthy fats. This helps ensure your body receives the essential nutrients it needs to function properly, reducing the risk of deficiencies and supporting overall health.

Regularly monitor your health

Regularly monitoring your health is essential for preventing nutrient deficiencies while on Mounjaro. Schedule routine check-ups with your doctor to assess your overall well-being and track nutrient levels through blood tests. This allows for early detection of any deficiencies and ensures you have enough time to adjust your diet or supplements.

Drink plenty of water

Staying well-hydrated is a key step in preventing nutrient deficiencies while on Mounjaro. Drinking plenty of water helps support the absorption of essential vitamins and minerals and promotes overall health. Proper hydration also aids digestion, circulation and the body's ability to process supplements and nutrients effectively.

Consult your doctor or nutritionist

Consulting your doctor or nutritionist is essential for preventing nutrient deficiencies while on Mounjaro. A healthcare professional can help you develop a personalised nutrition plan tailored to your specific needs and goals. They can identify potential deficiencies, recommend appropriate supplements and provide guidance on dietary changes to ensure you are eating a healthy, balanced diet.

Final Thoughts: Should You Take Vitamins on Mounjaro?

Taking Mounjaro for weight loss or diabetes management is a positive step towards better health, but ensuring you get enough nutrients is just as important.

✅ Remember:
✔ Not everyone using Mounjaro needs supplements, but deficiencies can happen.
✔ Focus on a balanced diet with nutrient-rich foods.
✔ If needed, supplement with essential vitamins like B12, D, calcium, and iron.
✔ Get regular blood tests and adjust your diet accordingly.

💡 Always consult with your GP before starting any supplements to ensure they’re right for you.

By staying informed and making smart choices, you can maximise the benefits of Mounjaro while maintaining optimal health and well-being.

Disclaimer: This guide is for informational purposes only. Always consult a healthcare professional before starting any new medication or lifestyle changes.

Sources

[1] Vitamin B12 or folate deficiency anaemia - Symptoms - NHS

[2] Scurvy - NHS

[3] Vitamin D - NHS

[4] Iron deficiency anaemia - NHS

[5] Potassium test - NHS

[6] About Calcium and Calcium Deficiency - NHS

[7] Zinc deficiency, excess and supplementation - Patient

[8] Magnesium test - NHS

Essential Tips for Using Mounjaro Safely and Effectively

Want to get the best results from Mounjaro? UK Meds' complete guide to Using A Mounjaro Injection covers everything you need to know, from:

• Managing your dose

• Tracking progress

• Dietary changes

• Exercise recommendations

• Dealing with side effects

• Which vitamins you can take

• How to handle sulphur burps

• Where to find support in the UK

• Storage instructions & temperature advice

• Microdosing GLP-1 Medications for Weight Loss: Is It A Good Idea?

Our usage guide has all the advice you need to kickstart a smoother weight loss journey with Mounjaro.