Mounjaro and muscle loss: How to stay strong with the help of the right supplements

What Mounjaro is and how it acts on metabolism

Mounjaro® (tirzepatide) is an injectable medication initially approved for the treatment of type 2 diabetes, which has also demonstrated extraordinary effectiveness in weight-loss protocols for people with obesity or overweight. It belongs to a new generation of drugs that act dually on the intestinal hormonal system, making it one of the most comprehensive therapies currently available.

What sets it apart from other medications such as Ozempic® is that Mounjaro simultaneously activates the GLP-1 and GIP receptors, two hormones that regulate appetite, the insulin response, and energy metabolism.

How does Mounjaro work?

How much weight can be lost with Mounjaro?

The most recent data from the clinical trial SURMOUNT-1 (NEJM, 2022) reveal:

• Up to 22% total body weight loss over 72 weeks (with a 15 mg dose).

• Greater weight loss than Ozempic® in all analyzed subgroups.

• Significant reduction in waist circumference and inflammation markers.

However, up to 40% of that lost weight may be lean mass, which includes muscle if measures are not taken to prevent it.

This is where supplementation and training come into play: lose fat, not muscle.

Why muscle mass may decrease during treatment

The main hidden risk during treatment with Mounjaro® is that, although weight loss is usually significant, not all of that lost weight is fat. A significant proportion may be lean mass, especially if protein intake and strength training are neglected.

This occurs for several physiological reasons associated with the drug’s mechanism:

Why do we lose muscle with Mounjaro?

1. Reduced appetite: people eat much less and often neglect their daily protein intake.

2. Prolonged calorie deficit: if it is not properly adjusted, the body uses muscle tissue as an energy source.

3. Lower mechanical load: as body weight decreases, the physical stimulus on the muscles is reduced.

4. Rapid weight loss: the faster weight is lost, the greater the proportion of lean mass lost if no appropriate action is taken.

Table: Comparison of weight lost with Mounjaro

Source: SURMOUNT-1 (2022), NEJM; Wolfe (2017), J. Nutrition.

What can cause this muscle loss?

• Reduced basal metabolism: your body burns fewer calories at rest.

• Higher risk of regain: when you lose muscle, it is easier to regain fat later.

• Loss of strength and muscle tone: it affects performance, even during everyday tasks.

• Increased frailty (especially in older adults): it promotes premature sarcopenia.

Key takeaway: Mounjaro muscle mass should appear in the same sentence: if you use tirzepatide, you need a plan to preserve your muscle tissue from day one.

Key supplements for preserving strength

During treatment with Mounjaro®, your body enters a state of continuous weight loss. But if you do not take measures, you can lose both fat and muscle. This is where supplementation plays an essential role: it helps protect your lean mass, maintain strength, and support your metabolism even with fewer calories.

We explain which ones are the most important and how you can easily incorporate them into your daily routine with quality products from Moremuscle

1. Protein: the basic pillar for preserving muscle

Protein is not only used to build muscle; it also helps maintain it when you eat less. During treatment with Mounjaro, many people eat less without realizing it, which can lead to a deficiency of essential amino acids.

Taking protein powder:

• Provides a complete dose of high-quality amino acids.

• It is easy to take even when you have little appetite.

• Promotes muscle recovery after training or walking.

Which one should you choose?

• Whey Protein 80: a classic, balanced option that is easy to digest.

• Isolate 90 CFM: ultra-pure, lactose-free, ideal if you are cutting or looking for maximum absorption.

• Iso Clear Protein: refreshing and similar to a sports drink, perfect if you do not feel like having thick shakes.

• SOY Isolate90: 100% plant-based protein for people with milk intolerance or a vegan lifestyle.

Goal: consume at least 1.6–2 g of protein per kg of body weight per day.

2. Creatine: your shield against loss of strength

Creatine monohydrate is probably the supplement best supported by science. Its main function is to increase the production of rapid energy (ATP) in the muscles, allowing you to train better, maintain strength, and prevent muscle breakdown, especially during a calorie deficit.

It also offers benefits for cognitive health, muscle aging, and the prevention of sarcopenia.

Which creatine products do we recommend?

• Creatine Monohydrate: available in Creapure®, Clonapure®, or 200 Mesh versions. All offer high purity, maximum safety, and excellent solubility.

• Creamag: with Albion® magnesium, it supports muscle contraction and reduces fatigue.

• Creatine Performance: combines creatine with electrolytes to prevent cramps and dehydration.

Take 3–5 g daily, preferably post-workout or with a main meal.

3. HMB: powerful anti-catabolic support during a calorie deficit

HMB (beta-hydroxy-beta-methylbutyrate) is a derivative of leucine that reduces muscle breakdown and improves recovery. It is especially suitable for people who:

• They have a very low protein intake.

• They are in an aggressive weight-loss phase.

• They cannot train with the same intensity.

It is also very useful for people over 40 and sedentary people who are beginning to lose muscle tone.

Which option should you choose?

• HMB: 1,000 mg capsules with good absorption and a convenient format.

Effective dose: 2–3 g per day, divided into 2–3 doses.

4. Omega 3: muscle, metabolism, and inflammation under control

Omega-3 fatty acids (EPA and DHA) do more than just protect your heart. They also:

• Improve insulin sensitivity.

• Reduce systemic inflammation.

• Stimulate anabolic pathways that support muscle maintenance.

This is especially important when you are undergoing treatment with Mounjaro, as the body tends to reduce both fat and muscle.

Which Omega 3 should you choose from Moremuscle?

• Omega 3: standard version, effective and well tolerated.

• Ultra Omega 3: higher concentration per capsule, ideal if you only take 1–2 per day.

• Omega 3-6-9: a complete profile for comprehensive support.

• Superba Krill Oil 2: maximum bioavailability, with choline and antioxidants.

Take 2–4 capsules daily with your main meals.

Supplements to protect your muscle while using Mounjaro