01

The muscle gap

The most significant hurdle with GLP-1 medications is something called "muscle stripping." The landmark STEP 1 trial of semaglutide found that lean mass can account for nearly 40% of the total weight lost on the medication¹. A 2023 meta-analysis of GLP-1 trials confirmed the pattern across the drug class².

Why does this matter? Muscle is your metabolic engine. It's what keeps your resting calorie burn high. When you lose muscle, your metabolism slows down, making it much harder to maintain your results once the medication dose is lowered or stopped³.

Creatine is the most researched ergogenic aid in history for a reason. It works by increasing intramuscular stores of phosphocreatine, which helps your muscles produce energy (ATP) more efficiently. This keeps your muscle fibres hydrated and supported, effectively acting as a shield against the catabolic (muscle-wasting) effects of a deep caloric deficit⁴.

02

Blood sugar support

GLP-1s are well known for their ability to manage insulin and blood sugar. But creatine has its own pathway for glucose handling.

Skeletal muscle is your body's largest "sink" for glucose. It's where 80% of your post-meal sugar goes to be processed. Research shows that creatine supplementation can increase the activity of GLUT-4 transporters, which are the doors that let sugar into your muscle cells⁵.

By taking creatine alongside a GLP-1, you're supporting blood sugar management from two angles: the medication optimises the hormonal side, while the creatine optimises the "hardware" (your muscles) to handle the glucose more effectively⁶.

03

Diet brain and fatigue

Weight loss journeys, especially those involving appetite suppression, can sometimes lead to brain fog or mental fatigue.

Your brain is an energy hog, consuming about 20% of your daily calories. Just like your muscles, your brain uses creatine to maintain its energy reserves. Studies have shown that supplemental creatine can improve cognitive processing and mental clarity, particularly when the body is under metabolic stress or caloric restriction⁷. It's the mental lift many people need when their energy intake is lower than usual.

04

Cellular hydration, not bulk

A common myth is that creatine makes you bulky or bloated. In reality, creatine pulls water inside the muscle cell (intracellular hydration), not under the skin.

For someone on a GLP-1, this is actually a benefit. This cellular swelling is a powerful signal for the body to keep building protein and stay anabolic, even while you're losing fat⁴. It gives your muscles a fuller, healthier appearance rather than the flat look that can sometimes accompany rapid weight loss.

05

How to start

If you are currently taking a GLP-1 medication, adding creatine is one of the simplest and most cost-effective ways to optimise your health.

• The dose: You don't need a loading phase. A simple 5 grams of creatine monohydrate daily is the gold standard⁸.
• The timing: It doesn't matter when you take it. Consistency is what counts. Mix it into your morning water, coffee, or a protein shake.
• The must-have: To get the most out of this protocol, you must pair it with some form of resistance training. Even two sessions a week of lifting weights or using resistance bands tells your body, "we still need this muscle."

GLP-1s are a powerful tool, but they shouldn't work alone. By adding creatine, you aren't just losing weight. You're building a more resilient, metabolically flexible version of yourself.

06

Protecting what the scale hides

The number on the scale is not the same as the body composition underneath it. Losing weight quickly without protecting lean mass means losing the tissue that drives metabolism, supports strength, and protects against the cardiometabolic risk GLP-1s are often prescribed to address. The combination of creatine monohydrate plus resistance training is the most evidence-backed way to defend that tissue while the medication does the work of reducing intake.

For the underlying mechanism and dosing detail, see Creatine for Women's Health. If energy and fatigue on the protocol are part of the picture, Perimenopause Fatigue and How to Boost Your Energy covers the sleep, mood, and nutrition levers worth pulling alongside.