Creatine Explained: Benefits, How It Works, How to Use It & Common Myths

Few supplements have been studied as extensively as creatine monohydrate. It’s been the subject of decades of clinical research, including a comprehensive position stand from the International Society of Sports Nutrition (ISSN) that reviewed safety and efficacy data across a wide range of populations. Despite that research base, creatine remains surrounded by persistent myths — that it’s a steroid, that it damages kidneys, that it’s only useful for bodybuilders. Almost none of that holds up against the actual evidence.

This guide covers what creatine is, how it works, what benefits are genuinely supported by research, how to use it, and where the common myths actually come from.

What Is Creatine?

Creatine is a naturally occurring compound made from three amino acids (arginine, glycine, and methionine). The body produces some creatine on its own — primarily in the liver, kidneys, and pancreas — and also obtains it from dietary sources, mainly meat and fish. Roughly 95% of the body’s creatine is stored in skeletal muscle, where it exists largely as phosphocreatine, a high-energy reserve the body taps into for very short bursts of intense effort.

How Creatine Works

Muscle contraction requires ATP (adenosine triphosphate), the cell’s primary energy currency. During short, high-intensity effort — a heavy lift, a sprint, a jump — the body burns through available ATP within seconds. Phosphocreatine helps regenerate ATP rapidly, extending the muscle’s capacity for that kind of explosive effort by a few extra seconds to tens of seconds, depending on the activity.

Supplementing with creatine increases the muscle’s phosphocreatine stores, which is the mechanism behind its most well-established benefit: improved capacity for repeated bouts of short-duration, high-intensity exercise.

What Creatine Actually Does (Evidence-Based)

According to the ISSN position stand, creatine monohydrate is considered the most effective nutritional supplement currently available for increasing high-intensity exercise capacity and supporting lean muscle mass gains during training. Supported benefits include:

• Improved performance in short-duration, high-intensity exercise — sprinting, heavy resistance training, jumping
• Greater strength and power gains when combined with resistance training, compared with training alone
• Support for lean mass gains during structured training programs
• Enhanced training capacity, allowing for more total work across sets and sessions in some contexts

Beyond athletic performance, a growing body of research has explored creatine’s role in several other areas, including post-exercise recovery, injury prevention, and rehabilitation support, as well as potential applications being studied in conditions such as certain neurodegenerative diseases, aging-related muscle loss, and cognitive function under specific conditions (like sleep deprivation). Much of this broader research is described by the ISSN as promising but still developing — it should be understood as an active area of study rather than an established, primary reason to supplement.

Natural Sources of Creatine

Creatine is found naturally in animal-based foods:

• Red meat (beef, in particular, is a concentrated source)
• Pork
• Fish — herring, salmon, and tuna contain meaningful amounts
• Poultry, in smaller amounts

A typical omnivorous diet provides roughly 1–2 grams of creatine per day. Because creatine is essentially absent from plant foods, vegetarians and vegans tend to have lower baseline muscle creatine stores — which is part of why some research shows a more pronounced response to supplementation in these groups, since they’re starting from a lower baseline.

How to Use Creatine

The two most commonly used approaches, both supported in the research:

1. Loading phase approach

• ~20 grams/day (split into 4 doses of 5g) for 5–7 days
• Followed by a maintenance dose of 3–5 grams/day
• Saturates muscle creatine stores faster

2. Steady-dose approach (no loading)

• 3–5 grams/day from the start
• Reaches the same muscle saturation point as the loading approach, just over roughly 3–4 weeks instead of about a week

Neither approach is “more correct” — the loading phase simply gets you to full muscle saturation faster; the steady-dose approach gets you there more gradually with a simpler routine. Timing relative to workouts (before vs. after) has not been shown to make a meaningful difference for most people; consistency of daily intake matters more than precise timing.

Creatine monohydrate remains the most researched and most commonly recommended form. Other forms (creatine hydrochloride, buffered creatine, creatine ethyl ester, and others) are marketed on claims of better absorption or reduced water retention, but the ISSN position stand notes that monohydrate remains the reference standard against which other forms are compared, and the evidence supporting meaningful advantages of alternative forms over monohydrate is limited.

Common Creatine Myths, Addressed

Myth: Creatine damages the kidneys.

This is one of the most persistent myths, and it doesn’t hold up in the research on healthy individuals. The confusion likely stems from the fact that creatine supplementation slightly increases serum creatinine (a kidney function marker), which can look like reduced kidney function on a lab test — but this reflects increased creatine turnover, not actual kidney damage. The ISSN position stand notes that studies have found creatine supplementation, including at doses up to 30 g/day for extended periods, safe in healthy individuals. People with pre-existing kidney disease should still consult a healthcare provider before supplementing, since research specifically in that population is more limited.

Myth: Creatine is a steroid.

Creatine is not a steroid and does not affect hormone levels the way anabolic steroids do. It’s a naturally occurring compound found in food and produced by the body; supplementation simply increases the amount stored in muscle.

Myth: Creatine causes excessive bloating or water retention.

Creatine does draw some water into muscle cells (this is part of how it supports cell volumization, which may itself contribute to muscle growth signaling), but this is intracellular water retention within muscle tissue, not the kind of subcutaneous bloating people often picture. Most research does not support significant unwanted water retention outside of muscle tissue at standard doses.

Myth: You need to cycle on and off creatine.

There’s no strong evidence supporting mandatory cycling. Long-term studies (including some spanning years) have found continuous use safe and effective in healthy individuals without needing planned breaks.

Myth: Creatine is only useful for bodybuilders.

Because it improves capacity for short, high-intensity effort, creatine is relevant to a range of activities beyond bodybuilding — team sports involving sprinting and jumping, resistance training generally, and some research on its potential relevance to aging-related muscle preservation.

Who Should Be Cautious with Creatine

• People with pre-existing kidney disease should consult a healthcare provider before use, given more limited research specific to that population
• People on medications that affect kidney function should discuss creatine with their provider
• Creatine has not been extensively studied in pregnant or breastfeeding individuals, so it’s generally not recommended in the absence of medical guidance
• Mild gastrointestinal discomfort is possible, particularly with high loading-phase doses, and can often be reduced by splitting doses and taking with food or water

Key Takeaways

• Creatine supports rapid ATP regeneration during short, high-intensity effort, making it useful for strength and power activities.
• It’s one of the most researched supplements available, with a well-established safety profile in healthy individuals, including at higher doses over extended periods.
• Creatine monohydrate remains the most studied and most commonly recommended form.
• Both loading-phase and steady-dose approaches reach the same muscle saturation point; loading is just faster.
• The kidney-damage myth stems from a misunderstanding of creatinine as a lab marker, not actual evidence of harm in healthy people.
• People with kidney disease, or who are pregnant or breastfeeding, should consult a healthcare provider before use.

Sources & Further Reading

• 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. *Journal of the International Society of Sports Nutrition*. 2017;14:18. PMC5469049 / PubMed

*This article is for general educational purposes and is not a substitute for individualized medical advice. Speak with a healthcare provider before starting any new supplement, particularly if you have kidney disease or are pregnant or breastfeeding.*