Taking creatine supplements, even for several weeks or at different doses, doesn't make your brain work better if you're a healthy person — whether you're a kid, a vegetarian, or an older adult.

Taking creatine every day for six weeks or more doesn't make your memory, focus, or thinking skills any better if you're a healthy adult.

Taking creatine powder at a high dose for a week doesn't make your brain work better in general — except for one tiny improvement in a specific test that measures how quickly you can ignore distractions. Your memory, focus, and decision-making don't improve at all.

Taking creatine for a week at a high dose doesn't reliably make your brain work better—maybe it helps a little with one type of quick thinking test, but it doesn't help with memory, focus, or other brain skills.

Taking creatine supplements at 10–20 grams per day for six weeks does not lead to measurable changes in body fat, muscle mass, how much people move, or how many calories they consume.

Taking creatine supplements at 10 or 20 grams per day for six weeks does not improve how quickly healthy young adults process information, remember events, or make decisions.