
Mounjaro (tirzepatide) has rapidly become the leading GLP-1 medication for weight management in the UK, with recent data showing that 77.6% of users are women and that females in their 40s and 50s are the largest demographic group. Over 60,000 women in the UK have started Mounjaro with SheMed , and average weight loss in clinical trials ranges from 16% to 22.5% of body weight. It is a powerful tool that is changing lives for the better. However, a crucial part of this journey, and one that is often overlooked, is ensuring your body receives the vital nutrients it needs to thrive.
Mounjaro works, in part, by reducing appetite. While this is key to its effectiveness, a lower food intake can naturally lead to a reduced intake of essential vitamins and minerals. This isn't a cause for alarm, but rather a call for mindful planning. The goal of this article is to serve as your comprehensive guide to the supplements that may be beneficial for women taking Mounjaro. We will explore the essential nutrients to consider, supplements that can help manage common side effects, and the critical precautions to take.
To appreciate why supplements may be necessary, it's important to understand how Mounjaro interacts with your body. Mounjaro is a dual GIP and GLP-1 receptor agonist. These gut hormones play a significant role in regulating blood sugar and, crucially, signalling feelings of fullness to your brain. This leads to a natural reduction in appetite and, consequently, you eat less.
While this is excellent for weight management, a smaller volume of food can mean fewer vitamins, minerals, and macronutrients. Over time, this can create nutritional gaps that may affect your energy levels, bone health, and overall well-being. Furthermore, some medications in this class can affect how certain nutrients, like vitamin B12, are absorbed in the gut. In my practice, I've observed similar patterns with other medications that influence appetite and digestion; proactively addressing nutrition is a cornerstone of successful long-term treatment. It's not just about losing weight; it's about gaining health. A well-planned, nutrient-dense diet is your foundation, and supplements are the targeted support to ensure that foundation remains solid throughout your Mounjaro journey.

Think of these as the foundational supports that nearly every woman on Mounjaro should consider discussing with her doctor. They address the most common potential deficiencies arising from reduced food intake.
A high-quality daily multivitamin acts as a nutritional "safety net." It's an effective way to bridge any small, daily gaps in your diet. When you're eating less, it can be challenging to get the full spectrum of micronutrients your body needs every single day.
Vitamin B12 is critical for energy production, nerve function, and the formation of red blood cells. A deficiency can lead to fatigue, weakness, and even neurological issues.
Because GLP‑1 drugs slow gastric emptying and often change diet, some experts recommend monitoring B12 in patients who already have risk factors for deficiency (for example, those on metformin or with restricted diets), but a direct causal effect of tirzepatide on B12 absorption has not been firmly established in clinical trials. But rapid weight loss and GI side effects (nausea, vomiting) can further reduce overall nutrient intake and may contribute to lower B12 status over time.
In the UK, we are all too familiar with a lack of consistent sunshine. For this reason, the NHS officially recommends that everyone should consider taking a daily vitamin D supplement during the autumn and winter months. For those on Mounjaro, it's even more critical.
Rapid, significant weight loss on tirzepatide raises concerns about loss of bone mineral density, especially in midlife and older adults. Vitamin D and calcium are often recommended together in GLP‑1/tirzepatide pathways to support bone health and calcium absorption during aggressive weight reduction.
Iron is a component of haemoglobin, the protein in red blood cells that carries oxygen around your body. Low iron levels can lead to anaemia, with symptoms like persistent fatigue, shortness of breath, and pale skin.
Mounjaro commonly causes nausea, reduced appetite and sometimes vomiting or diarrhoea, especially during dose escalation, which can lower overall food intake and change food choices. This may mean less red meat and other iron‑rich foods, so iron intake can fall over time.
Significant calorie restriction or highly selective “safe foods” while on Mounjaro can reduce intake of haem iron (meat, fish) and non‑haem iron (pulses, greens, fortified cereals), increasing the risk of low stores in susceptible patients.
Magnesium is a powerhouse mineral involved in over 300 biochemical reactions in the body, including muscle and nerve function, blood sugar control, and blood pressure regulation.

Beyond the essential nutrients, certain supplements can be incredibly helpful for managing some of the common side effects associated with Mounjaro, making your experience smoother and more comfortable.
One of the most frequently reported side effects of Mounjaro is constipation, as the medication slows down gastric emptying. A fibre supplement can be a gentle and effective solution.
Side effects like vomiting or diarrhoea, although less common, can lead to dehydration and an imbalance of electrolytes (minerals like sodium, potassium, and magnesium). Maintaining electrolyte balance is crucial for nerve signalling, muscle contraction, and hydration.
When you lose weight, especially rapidly, your body can lose both fat and muscle mass. The goal is to preserve as much lean muscle as possible, as it is metabolically active and essential for strength and function.
During significant weight loss, skin elasticity and joint health can be a concern. Collagen is the main structural protein in your connective tissues, including your skin, tendons, and ligaments.
Navigating supplements can feel complex, but adhering to a few key principles will ensure you do so safely and effectively. This is where the partnership between you and your healthcare provider is most important.
If you are feeling unsure about anything, it is always best to speak with your GP first. If you are registered with SheMed, you can also reach out to our support team, who will be happy to guide you.
How and when you take your supplements can dramatically affect their absorption. As a rule of thumb, always read the label.
Supplements are exactly that-supplementary. They are designed to complement a healthy diet, not replace it.
Pay attention to how your body feels after introducing a new supplement. While rare, side effects can occur. If you notice any adverse reactions, stop taking the supplement and consult your doctor.
The supplement industry is not as tightly regulated as pharmaceuticals. Choose products from reputable, well-established brands that engage in third-party testing to verify the purity and potency of their ingredients.
In my clinical experience, the patients who achieve the most sustainable success are those who view their medication as one part of a holistic approach to health. They work collaboratively with their healthcare team, prioritise nutrition, and make informed choices about supplementation.
Mounjaro is a remarkable medical advancement for women's health, offering a powerful pathway to improved weight and metabolic function. By taking a proactive and informed approach to your nutrition, you can ensure your body is fully supported throughout this transformative journey.
The key supplements we've discussed a multivitamin, vitamin B12, vitamin D, iron, and magnesium—form a strong foundation for health while on Mounjaro. Additional support from fibre, electrolytes, protein, and collagen can further help you manage side effects and optimise your results.
However, the most important takeaway is the principle of personalised care. Your health needs are unique, and the single most critical step you can take is to have an open and honest conversation with your doctor. They are your best resource for creating a safe, effective, and tailored supplement plan that works in harmony with your Mounjaro treatment.
By combining this powerful medication with mindful nutrition and expert medical guidance, you are not just losing weight - you are building a foundation for a healthier, more vibrant future.
If you are considering Mounjaro or have any questions about whether it is right for you, reach out to our support team and we will be happy to help.