Creatine — The Complete Guide

Creatine is the most researched performance supplement in sports nutrition — and one of the few that lives up to the claims. Hundreds of peer-reviewed studies have examined its effects on strength, power, muscle growth, brain function and recovery^[1].

This is our working guide to creatine. We’ll keep expanding it as new research comes out.

What Is Creatine?

Creatine is a compound your body produces naturally from three amino acids — arginine, glycine, and methionine. About 95% of it is stored in skeletal muscle as phosphocreatine, where it plays a central role in energy production. Your body makes around 1 gram per day on its own, and you get another 1–2 grams from food (mainly red meat and fish). Enough to stay alive — not enough to saturate your muscles for peak performance.

How Creatine Works

Your muscles use ATP (adenosine triphosphate) for short, explosive efforts — sprinting, lifting, jumping. ATP depletes within seconds. Phosphocreatine donates a phosphate group to regenerate ATP, which lets you push harder for longer before fatigue sets in. Supplementing with creatine raises your muscle’s phosphocreatine stores, giving the ATP-CP energy system more fuel. That’s the mechanism behind most of its performance benefits.

The Benefits, by the Numbers

• Strength and power: reviews report gains of about 5 to 15% in max strength, sprint power and repeated high-intensity efforts^[2]
• Muscle mass: greater gains in lean mass when creatine is combined with resistance training^[1]
• Brain function: some studies report better memory and processing, most clearly under sleep deprivation^[3] (see Cognitive Benefits)
• Recovery: some studies report better glycogen refilling and lower muscle-damage markers after hard training^[1]
• Older adults: creatine with resistance training is being studied to help keep muscle with age^[3]

How to Take Creatine

The simple answer: 5 grams per day, every day, with or without food.

Some protocols use a “loading phase” of 20–25 grams per day for 5–7 days to saturate muscle stores faster. Both approaches end up at the same place after a few weeks. See Loading vs. Daily Dosing for the details.

You don’t need to cycle creatine. You don’t need to time it around workouts. Consistency is what matters.

Is Creatine Safe?

For healthy people, yes. The International Society of Sports Nutrition position stand concludes creatine monohydrate is safe at recommended doses, and studies of daily use for up to 5 years found no harm to kidney or liver function in healthy individuals^[1]. Research does not support the old worries about dehydration and cramping^[3]. If you have pre-existing kidney disease, consult your physician before starting any supplement.

Which Type Should You Buy?

Monohydrate is the clear winner — most researched, cheapest, as effective as any other form. Don’t pay more for “advanced” versions without evidence they work better. Full breakdown on the Types of Creatine Compared page.

Who Benefits Most

• Strength and power athletes
• Endurance athletes (intervals, sprint finishes)
• Older adults (muscle and cognitive preservation)
• Vegetarians and vegans (lower baseline stores)

Explore the Research

• Cognitive Benefits
• Loading vs. Daily Dosing
• Types of Creatine Compared
• Creatine for Women
• Creatine for Men
• Recovery and Injury Research

Sources

1. Kreider RB, Kalman DS, Antonio J, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017;14:18.
2. Kreider RB. Effects of creatine supplementation on performance and training adaptations. Mol Cell Biochem. 2003;244(1-2):89-94.
3. Antonio J, Candow DG, Forbes SC, et al. Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? J Int Soc Sports Nutr. 2021;18:13.

Reviewed October 20, 2026 by the SaltyFuelShop team against the sources listed below.

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This guide is for educational purposes and is not medical advice. Talk to your doctor before starting a supplement, especially if you have a health condition, take medication, or are pregnant or nursing.