xwalker
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I have patients with liver disease who have no other discernible etiology besides their histories of creatine use in power lifting. Kidney disease has also been shown, including acute tubular necrosis and chronic glomerulonephritis.
As one poster stated earlier, a daily low dose is not likely to cause pathology, but the levels achieved by that are also not likely to be significantly higher than the body's own physiologic production. If the levels used by lifters (30 - 50mg once or twice daily) are sustained for 2-5 years or more, the likelihood of consequences is high. It may take 20 - 30 years before the pathology starts to become apparent, and at this point there is lack of clarity on the additive effects of other agents that have been used concurrently.
The message is simply that there is evidence of damage with creatine and other such substances, and insufficient time has passed to conclude that there is any safe level above physiologic. It took several generations before tobacco was found to be so significantly destructive. Vitamins were thought to be key additives to the diet for more than 50 years, but have now been found to be deleterious when taken in excess.
I don't have any disrespect for anyone's opinions on this issue of health and nutrition, but my daily involvement, liability, and recommendations can not include advice that has shown any increased risk.
I would guess there is a high probability that "power lifters" have used something stronger than creatine at some point but are unlikely to admit to it.