Creatine Supplements for Muscle Growth: Do They Work?

Creatine is a natural compound that's produced by the body, specifically in your liver and kidneys, and a little bit in your pancreas. It is a simple compound made from three amino acids: arginine, glycine, and methionine.

It is found in small amounts in meat and fish that you eat (anywhere from 0.4–1.8 grams per 100 grams of meat or fish). Creatine is also found in your own muscles, where it serves a simple but important function: energy.

When you lift a weight, sprint, or perform any short, explosive form of exercise, your body turns to a quick energy source called the “adenosine triphosphate phosphocreatine system” (ATP-PCr). In this energy system, creatine phosphate "donates" a phosphate group to regenerate ATP, which is the energy source that your body ultimately runs on.

Without enough creatine, this energy system runs out of ATP quickly, and you’ll get tired and start to fatigue. So, the more creatine that's stored in your muscles, the more energy you’ll be able to generate. And if you have more energy in your muscles, you should be able to do high-intensity exercise longer and harder.

So, the most obvious benefit of creatine supplementation is performance. Creatine supplementation has been shown to consistently improve multiple performance metrics. This includes strength, sprint speed, muscular endurance, and total training volume.

In practice, this might mean completing a few more reps per set or a few more sets per session. You may also recover faster between sets or feel less fatigued during workouts. This might seem like a small gain (which it is). But when this is applied consistently over a few months, these small gains compound.

More exercise, be that reps, sets, or weight, means more work. More work, over weeks and months, means more muscle. Research shows that when combined with resistance exercise, 6–12 weeks of creatine supplementation can add an extra kilogram of muscle.

Creatine & Water Retention: Is it Just Water Weight?

Besides increasing your energy levels and exercise capacity, creatine also increases muscle growth by drawing fluid into your muscle cells. Yes, this is water weight, but it's not bloating. The water is inside your muscle, not under your skin.

This makes muscles appear fuller and larger, even before you've actually started building new muscle "tissue". Some scientists also think that the swelling of the muscle alone can actually stimulate muscle growth by itself!

So there's potentially a 3-prong benefit of taking creatine:

1. It stimulates more muscle growth via increased work capacity
2. It increases the size of the muscle by increasing "intracellular" water retention
3. The increased water retention potentially stimulates muscle growth further.

Creatine-Rich Foods: Can You Get Enough

You probably cannot get enough creatine from your diet alone. You’d need to eat a large amount of steak or salmon to get about 1 to 2 grams of creatine every day. Compare this to the typical effective dose for supplementation, which is 3–5 grams a day. For athletes, vegetarians, or anyone training hard, relying on food alone is rarely enough.

Creatine, particularly creatine monohydrate (the most researched form of creatine), is inexpensive, well-tolerated, and effective. More expensive forms like creatine HCl, ethyl esters, or buffered creatine often claim superior effects; however, there's little consistent evidence to suggest that they are better for muscle growth than plain old creatine monohydrate.

How to Take Creatine: Dosing Options