Creatine monohydrate is one of the most researched and consistently effective supplements available — with over 500 clinical trials supporting its benefits for muscle strength, power output, exercise capacity, and body composition. It is also one of the cheapest effective supplements per serving. This guide covers the UK market specifically, whether creatine is useful during weight loss, and the specific considerations for GLP-1 medication users.
What creatine actually does
- Increases phosphocreatine stores in muscle — providing rapid ATP (energy) for high-intensity efforts lasting 1–10 seconds
- Allows more repetitions or higher power output per session — producing greater training adaptation over time
- Produces water retention within muscle cells (intracellular) — this is not the same as the subcutaneous water retention that masks fat loss; it represents muscle hydration
- May have direct anabolic signalling effects on muscle protein synthesis — evidence is emerging
- Potential cognitive benefits — creatine is found in high concentrations in the brain; supplementation may support memory and cognitive function
Is creatine useful during weight loss?
Yes — specifically for muscle preservation. During a calorie deficit, exercise performance tends to decline as the body adapts to lower energy availability. Creatine partially offsets this decline, allowing you to maintain more training intensity and volume, which in turn reduces the muscle loss that typically accompanies rapid weight loss.
The water retention question: creatine causes 1–2kg of intramuscular water retention when first starting supplementation. This appears on the scale as weight gain and can be disconcerting during a weight loss phase. It is not fat — it is muscle hydration. This water retention levels off after 1–2 weeks and does not reflect real body composition changes.
Best creatine products UK 2026
| Product | Form | Cost/month | Verdict |
|---|---|---|---|
| Creapure Creatine Monohydrate | Monohydrate (highest purity) | ~£12–15 | ⭐⭐⭐⭐⭐ Best quality |
| MyProtein Creatine Monohydrate | Monohydrate | ~£8–10 | ⭐⭐⭐⭐⭐ Best value UK brand |
| Optimum Nutrition Micronised Creatine | Micronised monohydrate | ~£12–18 | ⭐⭐⭐⭐ Good quality, trusted brand |
| Creatine HCl, ethyl ester, buffered | Alternative forms | ~£20–35 | ⭐⭐⭐ Not superior to monohydrate in evidence; higher cost |
Frequently Asked Questions
Is creatine safe to take on Mounjaro?
No known interactions between tirzepatide and creatine. Creatine is one of the safest supplements with 30+ years of safety data. The main consideration on GLP-1 medication is ensuring adequate hydration — creatine draws water into muscle cells and hydration requirements are already higher on GLP-1.
Does creatine help with weight loss?
Creatine does not directly cause fat loss. It helps preserve muscle during a calorie deficit, which prevents the resting metabolic rate decline that accompanies muscle loss. Better muscle preservation = better body composition during weight loss = easier weight maintenance long-term.
How do I take creatine?
3–5g per day in water. No need to time around workouts — total daily creatine intake matters more than timing. An optional loading phase (20g/day for 5–7 days) saturates muscle stores faster but is not necessary — 3g/day reaches saturation within 3–4 weeks.
Related: Supplements on Mounjaro UK | Protein Targets UK
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