Creatine FAQ: Common Questions Answered

Frequently Asked Questions About Creatine

Does creatine cause hair loss?

This concern traces back to a single 2009 study on college-aged rugby players that found a 56% increase in dihydrotestosterone (DHT) after a creatine loading phase (van der Merwe et al., 2009). DHT is the androgen implicated in androgenetic alopecia (male pattern baldness). However, the study did not measure hair loss, hair thickness, or any hair-related outcome.

No subsequent study has replicated the DHT finding. A 2021 systematic review and meta-analysis of 12 studies examining creatine’s effects on testosterone and DHT found no statistically significant effect on DHT levels (Antonio et al., 2021). The original study had a small sample size (20 participants), no placebo blinding confirmation, and the DHT values remained within normal physiological range throughout.

If you are genetically predisposed to male pattern baldness, the theoretical risk cannot be fully excluded based on one unreplicated study, but the current weight of evidence does not support a causal link between creatine and hair loss.

Is creatine safe for your kidneys?

In healthy individuals, yes. Creatine supplementation increases serum creatinine levels (a breakdown product of creatine phosphate), which can make kidney function blood tests appear abnormal. This is a measurement artifact, not kidney damage. Cystatin C-based measurements of kidney function, which are not affected by creatine intake, consistently show normal renal function in creatine users (Gualano et al., 2008).

Long-term studies spanning up to five years of continuous creatine use have found no adverse effects on kidney function in healthy populations (Poortmans & Francaux, 1999). A study in a single-kidney individual found no renal impairment after 35 days of creatine loading and maintenance (Gualano et al., 2010).

For individuals with pre-existing kidney disease, the data is insufficient to make safety claims. If you have chronic kidney disease or impaired renal function, consult a nephrologist before supplementing.

Do you need a loading phase with creatine?

No. A loading phase (20 g/day for 5-7 days) saturates muscle creatine stores faster, typically within one week. A maintenance dose of 3-5 g/day without loading achieves the same saturation level but takes approximately 3-4 weeks (Hultman et al., 1996).

The performance and body composition outcomes are identical by week four regardless of whether you loaded. Loading is useful if you want faster results (for example, before a competition), but it often causes more gastrointestinal discomfort and water retention in the initial days. For most people, starting with 3-5 g/day and being patient is the simpler and more comfortable approach.

Does creatine cause bloating?

Creatine does cause intracellular water retention, which is mechanistically distinct from the subcutaneous bloating people associate with feeling “puffy.” Creatine pulls water into muscle cells, increasing intracellular hydration. This can increase body weight by 1-3 kg (2-6 lbs) in the first one to two weeks, particularly during a loading phase.

Some individuals do experience gastrointestinal bloating (stomach distension, gas) at higher doses, particularly during loading. This is dose-dependent and typically resolves with lower doses. Taking creatine with meals, splitting the dose across the day, or using micronized creatine monohydrate can reduce GI symptoms.

The weight gain from creatine is water inside muscle tissue, not fat. It generally makes muscles look fuller rather than making you look bloated, though individual responses vary.

Is creatine a steroid?

No. Creatine is a naturally occurring compound synthesized from three amino acids (arginine, glycine, and methionine) in the liver, kidneys, and pancreas. It is also obtained from dietary sources, primarily red meat and fish. Your body typically produces about 1 g/day endogenously and obtains another 1-2 g from a mixed diet.

Anabolic steroids are synthetic derivatives of testosterone that bind to androgen receptors and alter gene expression. Creatine does not interact with androgen receptors, does not alter hormone levels (as confirmed by the meta-analysis above), and works through an entirely different mechanism: replenishing ATP via the phosphocreatine energy system.

Creatine is legal, approved by all major sports governing bodies (NCAA, IOC, WADA), and classified as a dietary supplement, not a controlled substance.

Can women take creatine?

Yes, and the evidence supports it. Women respond to creatine supplementation similarly to men, with improvements in strength, power output, and lean body mass. A review of creatine research in females found benefits for resistance training performance, recovery, and bone mineral density, with particular relevance for post-menopausal women (Smith-Ryan et al., 2021).

Women typically carry about 70-80% of the muscle creatine stores of men, which means there may be proportionally more room for improvement through supplementation. The effective dose for women is the same as for men: 3-5 g/day of creatine monohydrate.

The concern about creatine making women “bulky” is unfounded. Creatine does not increase muscle size beyond what your training stimulus and hormonal environment support. The 1-2 kg of water weight gain is intracellular and distributed across all muscle tissue, not concentrated in any visible way.

Does caffeine interfere with creatine?

Early research from the 1990s suggested that caffeine might negate creatine’s ergogenic effects on muscle relaxation time (Vandenberghe et al., 1996). This single study created a persistent myth. Subsequent research has not supported this finding. Studies combining creatine and caffeine supplementation have found no attenuation of creatine’s benefits on strength, power, or sprint performance (Trexler & Smith-Ryan, 2015).

The practical concern that caffeine is a diuretic and would “flush out” creatine is also unfounded. At typical consumption levels (1-3 cups of coffee), caffeine’s mild diuretic effect does not meaningfully affect muscle creatine retention.

You can take creatine and caffeine together or separately without concern. Most pre-workout supplements contain both.

What is the best form of creatine?

Creatine monohydrate. Despite dozens of alternative forms marketed at premium prices (creatine ethyl ester, creatine HCl, buffered creatine, creatine nitrate, creatine magnesium chelate), none has demonstrated superior bioavailability, muscle uptake, or performance benefits compared to standard creatine monohydrate in head-to-head clinical trials (Jager et al., 2011).

Creatine ethyl ester was shown to be inferior to monohydrate, degrading to creatinine (a waste product) faster than monohydrate in the body (Spillane et al., 2009). Creatine HCl is more soluble in water, which means you can dissolve it in less liquid, but solubility does not equal better absorption or efficacy.

Micronized creatine monohydrate (finer particle size) mixes more easily and may reduce GI discomfort in sensitive individuals, but it is chemically identical to standard monohydrate. Creapure is a branded form of monohydrate manufactured in Germany with verified purity, making it a good choice for those concerned about quality.

References

1. van der Merwe J, et al. Three weeks of creatine monohydrate supplementation affects dihydrotestosterone to testosterone ratio. Clin J Sport Med. 2009,19(5):399-404. PMID: 19741313

2. Antonio J, et al. Common questions and misconceptions about creatine: what does the scientific evidence really show? J Int Soc Sports Nutr. 2021,18(1):13. PMID: 33412501

3. Gualano B, et al. Effects of creatine supplementation on renal function. Eur J Appl Physiol. 2008,103(1):33-40. PMID: 18188581

4. Poortmans JR, Francaux M. Long-term oral creatine supplementation does not impair renal function. Med Sci Sports Exerc. 1999,31(8):1108-1110. PMID: 10449017

5. Gualano B, et al. Creatine supplementation in a subject with one kidney. Med Sci Sports Exerc. 2010,42(5):781. PMID: 20037483

6. Hultman E, et al. Muscle creatine loading in men. J Appl Physiol. 1996,81(1):232-237. PMID: 8828669

7. Smith-Ryan AE, et al. Creatine supplementation in women’s health. Nutrients. 2021,13(3):877. PMID: 33557850

8. Vandenberghe K, et al. Caffeine counteracts the ergogenic action of muscle creatine loading. J Appl Physiol. 1996,80(2):452-457. PMID: 8929583

9. Trexler ET, Smith-Ryan AE. Creatine and caffeine: considerations for concurrent supplementation. Int J Sport Nutr Exerc Metab. 2015,25(6):607-623. PMID: 25946994

10. Jager R, et al. Analysis of the efficacy, safety, and regulatory status of novel forms of creatine. Amino Acids. 2011,40(5):1369-1383. PMID: 21424716

11. Spillane M, et al. The effects of creatine ethyl ester supplementation. J Int Soc Sports Nutr. 2009,6:6. PMID: 19228401