What should you avoid combining with creatine?

If you take statins for your cholesterol, that is the combination you need to be most careful about. Statins can cause muscle damage, ranging from mild pain to serious breakdown of muscle tissue that can affect your kidneys. Creatine raises a blood marker that doctors use to detect that muscle damage. Because of creatine, that marker may already be elevated even when nothing is actually wrong, making side effects harder to spot. If you take statins and are considering creatine, always discuss this with your doctor^1,2,3,4.

Heavy and regular alcohol use is also a point of concern. A study of 475 patients with severe muscle breakdown found that toxins such as alcohol and drugs were the cause in nearly half of all cases, and kidney failure also occurred in nearly half of them⁵. In most cases, multiple factors were involved at the same time. If you combine creatine with heavy alcohol use, you increase the risk of muscle damage.

Then there is caffeine. A review suggested that caffeine may affect the transport proteins that carry creatine into your muscles, which could disrupt absorption⁶. However, the evidence for this is indirect and limited. How much this matters in practice has not been well established.

Finally, there is the familiar concern about hair loss through a hormone that can shrink hair follicles (DHT). A small study with 38 participants, lasting 12 weeks and using 5 grams of creatine per day, found no difference in that hormone or in the health of hair follicles compared to a placebo⁷. One caveat: several authors had financial ties to creatine manufacturers, and the study was too small to rule out rare effects.