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Follistatin-344 vs Creatine: An Uncomfortable Comparison

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At a glance

  • Creatine status / Over-the-counter dietary supplement; no FDA-approved drug application with creatine as the active ingredient [4][5]
  • Best-supported use / Repeated short bursts of high-intensity effort such as sprinting and weight training [4]
  • Typical protocol / 20 g/day for 5-7 days, then 3-5 g/day; or 3-6 g/day for 3-4 weeks without loading [4]
  • Safety position / ISSN says up to 30 g/day for 5 years is safe and well tolerated in healthy people [1]
  • Kidney tests / Serum creatinine rises about 0.13-0.14 mg/dL without a change in measured GFR [6][7]
  • Follistatin-344 / A form of follistatin, a protein that binds myostatin; no human outcome trial of the peptide found

What is the practical difference?

Creatine is a compound the body makes from glycine, arginine and methionine and also gets from meat and fish; it is sold over the counter as a dietary supplement [4]. A Drugs@FDA search returned no approved drug application with creatine as the active ingredient [4][5]. Follistatin-344 is a form of follistatin, a protein that binds myostatin. The comparison turns on human outcome data, and creatine has it: the ISSN position stand covers its safety and efficacy in exercise, sport and medicine [1], and NIH ODS names high-intensity effort as its best-supported use [4].

What creatine actually does

NIH ODS says creatine's best-supported use is repeated short bursts of high-intensity effort such as sprinting and weight training, and that it is of little value for endurance sports, where weight gain may hurt performance [4]. Typical adult protocols are 20 g/day in four 5 g portions for 5-7 days, then 3-5 g/day, or about 3-6 g/day for 3-4 weeks without loading; these are study protocols, not prescriptions [4]. The International Society of Sports Nutrition position stand says short- and long-term supplementation up to 30 g/day for 5 years is safe and well tolerated in healthy people [1].

What is Follistatin-344?

Follistatin-344 is a form of follistatin, a protein that binds myostatin. A binding mechanism is not an outcome: we found no human trial of the peptide that measured muscle growth or strength.

What should you watch for with creatine?

The main lab issue is kidney blood tests [7]. The body turns creatine into creatinine, the waste product standard kidney tests measure, so creatine can raise serum creatinine without kidney damage [6][7]. In a meta-analysis of 19 randomized trials plus one crossover study, serum creatinine rose by 0.13 mg/dL (95% CI 0.07-0.18), with no difference in eGFR [6]. A second analysis of 26 studies and 1,036 people found a 0.14 mg/dL rise (95% CI 0.05-0.22); GFR estimated from creatinine fell, but GFR measured by Cr-EDTA clearance did not [7]. Directly measured GFR trials in resistance-trained adults on a high-protein diet and in adults with type 2 diabetes found no loss of filtration [2][3]. Weight gain from water retention is the consistent side effect: about 1-2 kg in a month with strength training [4].

Frequently asked questions

Is creatine a steroid?
No. Creatine is made by the body from glycine, arginine and methionine and is found in meat and fish; it is sold as a dietary supplement [4].
Does creatine damage the kidneys?
Randomized trials that measured GFR directly found no loss of filtration in healthy trained adults and in adults with type 2 diabetes [2][3]. Creatine can raise serum creatinine by about 0.13-0.14 mg/dL without kidney damage [6][7].
Can caffeine cancel creatine benefit?
In one small study of 9 healthy men, creatine raised muscle phosphocreatine 4-6% and improved torque 10-23%, but adding caffeine 5 mg/kg/day removed the performance gain [8]. That was a performance interaction, not a safety finding.
How much creatine is used in studies?
NIH ODS describes 20 g/day in four 5 g portions for 5-7 days, then 3-5 g/day, or about 3-6 g/day for 3-4 weeks without loading [4]. The ISSN says up to 30 g/day for 5 years has been safe and well tolerated in healthy people [1].

References

  1. Kreider RB, Kalman DS, Antonio J, Ziegenfuss TN, Wildman R, Collins R, 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. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine
  2. Lugaresi R, Leme M, de Salles Painelli V, Murai IH, Roschel H, Sapienza MT, et al. Does long-term creatine supplementation impair kidney function in resistance-trained individuals consuming a high-protein diet?. J Int Soc Sports Nutr. 2013;10(1):26. Does long-term creatine supplementation impair kidney function in resistance-trained individuals consuming a high-protein diet?
  3. Gualano B, de Salles Painelli V, Roschel H, Lugaresi R, Dorea E, Artioli GG, et al. Creatine supplementation does not impair kidney function in type 2 diabetic patients: a randomized, double-blind, placebo-controlled, clinical trial. Eur J Appl Physiol. 2011;111(5):749-56. Creatine supplementation does not impair kidney function in type 2 diabetic patients: a randomized, double-blind, placebo-controlled, clinical trial
  4. National Institutes of Health. National Institutes of Health
  5. Drugs@FDA: FDA-Approved Drugs. Drugs@FDA: FDA-Approved Drugs
  6. Tsiaras A, Loufopoulos G, Theodoridis X, Liakopoulos V, Poulia KA, Chourdakis M. The Effect of Creatine Supplementation on Kidney Function: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. J Ren Nutr. 2026. The Effect of Creatine Supplementation on Kidney Function: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
  7. de Souza Almeida A, da Silva LOD, Takahasi BNA, Terada BD, Gonçalves FGA, Porto BC, et al. Impact of creatine supplementation on kidney health: a systematic review and meta-analysis. Int Urol Nephrol. 2026. Impact of creatine supplementation on kidney health: a systematic review and meta-analysis
  8. Vandenberghe K, Gillis N, Van Leemputte M, Van Hecke P, Vanstapel F, Hespel P. Caffeine counteracts the ergogenic action of muscle creatine loading. J Appl Physiol (1985). 1996;80(2):452-7. Caffeine counteracts the ergogenic action of muscle creatine loading
Evidence overview for follistatin 344: Follistatin-344 vs Creatine: An Uncomfortable Comparison