If you’ve ever told someone you take creatine, there’s a good chance they hit you with:
“Careful, that stuff’s bad for your kidneys.”
It’s one of the most persistent supplement myths out there — and one that science has been disproving for decades. So where did it start, and what do actual clinical studies say about creatine and kidney health? Let’s clear this up once and for all.
Where the Kidney Myth Came From
The myth likely began when early studies noticed that creatine supplementation increases creatinine levels in the blood.
But here’s the catch: creatinine isn’t the same as creatine, and higher creatinine doesn’t automatically mean kidney damage.
Creatinine is just a breakdown product of creatine metabolism — so if you take creatine, your body naturally produces more creatinine. It’s a normal physiological response, not a red flag.
A 2017 review by the Journal of the International Society of Sports Nutrition looked at years of data and found no evidence of kidney impairment in healthy individuals supplementing with creatine (Kreider et al., 2017).
What the Research Actually Says
Let’s look at what long-term studies show — because there’s a lot of them.
- In one of the most cited papers on the subject, researchers tracked healthy athletes using creatine for up to five years. Result? No adverse effects on kidney or liver function (Poortmans & Francaux, 1999).
- A randomized, double-blind trial on postmenopausal women found that creatine use not only improved muscle strength but also had no impact on kidney markers (Gualano et al., 2011).
- Even in clinical populations — such as people with type 2 diabetes — creatine showed no harmful changes in renal function when used responsibly (Gualano et al., 2010).
That’s decades of research, across men, women, and various health conditions — all pointing in the same direction: creatine is safe for your kidneys when used at recommended doses.
Who Should Be Cautious?
If you already have existing kidney disease, your doctor might advise against creatine — but that’s true for almost any supplement or medication that’s processed through the kidneys.
For everyone else? You’re in the clear. Just make sure you stay hydrated and stick to about 3–5g of creatine per day.
The Bottom Line
Creatine doesn’t harm healthy kidneys — that’s not opinion; it’s two decades of peer-reviewed evidence. The confusion came from misunderstanding lab markers, not actual renal stress.
If you want to dive deeper into other creatine myths, check out:
- Does Creatine Cause Bloating? The Truth According to Science
- Creatine and Hair Loss: Is There Any Real Evidence?
And to see what creatine does help with, we cover that in 5 Ways Creatine Boosts Brain Health (Not Just Muscle Gains) — you’ll be surprised how far its benefits go beyond the gym.
References
- Kreider RB et al. (2017). J Int Soc Sports Nutr., 14:18.
- Poortmans JR & Francaux M. (1999). Med Sci Sports Exerc., 31(8):1108–1110.
- Gualano B et al. (2011). Eur J Appl Physiol., 111(8):2059–2066.
- Gualano B et al. (2010). Eur J Appl Physiol., 108(5):963–970.
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