Does Creatine Cause You to Gain Weight? What the Research Shows

By Miles Sinclair

Updated November 2026

Creatine can cause you to gain weight, but the gain is usually small and mostly water. In the first week of loading, many people see a rise of one to three pounds on the scale. This comes from creatine pulling water into muscle cells, not from added body fat. Over the long run, the scale can keep climbing a little as muscle mass grows.

Why Creatine Causes Weight Gain on the Scale

Creatine monohydrate is stored mainly in skeletal muscle, where about 95 percent of the body’s creatine sits. Once inside muscle cells, creatine draws water with it. This is often described as cell volumization, and it is the most consistently reported effect in the research. Studies on creatine supplementation commonly find body mass increases of roughly one to two kilograms in the first week of loading, and most of that early gain is intracellular water.

Shopping for one? See our guide: Creatine HCL or Mono: Which Is Better for Muscle Gain?.

The gain is not a sign that creatine is stored as fat. Creatine does not contain calories in any meaningful amount, and the water shift happens independently of your energy balance. It is also why people sometimes describe feeling “fuller” or tighter in the muscles during the first few weeks.

Factors That Affect How Much Weight You Gain

Several variables determine whether you notice a change on the scale and how large it is.

• Loading versus maintenance dosing. A loading phase of about 20 grams per day split into four doses for five to seven days saturates muscle faster and produces a quicker water shift. A maintenance dose of 3 to 5 grams per day produces a slower, smaller change that often goes unnoticed for weeks.
• Body size and baseline muscle mass. Larger individuals and those with more muscle tend to have greater total creatine storage capacity, which can mean a larger absolute change.
• Total calorie intake. If you are eating in a surplus, the scale may rise for reasons unrelated to creatine. Energy balance still governs fat gain. Our guide on How the Energy Balance Equation Determines Weight Gain or Loss explains this in more detail.
• Training and muscle growth. Resistance training combined with creatine can support gains in lean mass over months. This weight is real tissue, not water.
• Sodium and carbohydrate intake. Diets high in sodium or carbohydrate can increase water retention independently of creatine.

Water Weight Versus Fat Gain

The distinction matters. Water weight from creatine is typically a one-time shift that levels off once muscle is saturated. Fat gain requires a sustained energy surplus over time. If your waist measurement, skinfold readings, or photos are stable while the scale rises slightly, the increase is more likely water or muscle. Consult a registered dietitian or physician if you have concerns about body composition, kidney function, or any existing medical condition before starting creatine.

What to Do If the Scale Bothers You

1. Skip the loading phase and take 3 to 5 grams per day. The total gain is similar over several weeks, but the early jump is smaller.
2. Track waist circumference and progress photos alongside body weight.
3. Weigh yourself at the same time each morning, after using the bathroom and before eating, to reduce daily noise.
4. Review your overall calorie intake. If you are unintentionally in a surplus, adjust portions rather than blaming creatine.
5. Keep sodium moderate and maintain consistent hydration.
6. Give it at least four weeks before judging the effect, since the initial water shift stabilizes.

What We’d Use

If you want a simple, well-studied option, creatine monohydrate is the form most research uses. Look for a product that lists creatine monohydrate as the single ingredient with a third-party testing seal. View on Amazon

For those who prefer a measured daily dose without mixing powder, pre-portioned capsules are an option. View on Amazon

Related Questions

Can creatine cause weight gain in women?

Yes, women can experience the same water-related increase in body weight. The amount depends on muscle mass and dosing, not sex alone. Our article Creatine for Gaining Weight: Why It Happens and What to Do covers the mechanism in more depth.

Does creatine make you bloated?

Some people report a feeling of fullness or tightness, especially during loading. Taking creatine with adequate water and spreading doses across the day may reduce discomfort. Persistent digestive symptoms should be discussed with a clinician.

Will the weight from creatine go away if I stop?

Much of the intracellular water shift reverses within several weeks after stopping, though muscle gains from training generally remain.

Is creatine weight gain the same as fat gain?

No. Creatine increases water stored in muscle cells. Fat gain requires an ongoing calorie surplus. Tracking waist size and trends over several weeks helps distinguish the two.

Does creatine help with weight loss?

Creatine does not directly cause fat loss. Some people use it to support training performance during a calorie deficit. See Does Creatine Aid Weight Loss? What the Evidence Shows for what the research indicates.

About Miles Sinclair

Miles Sinclair is part of our editorial team and reviews and edits our fitness science explainers guides, checking product details against manufacturer specifications and owner feedback.