Yes, you can bring creatine on a plane in both your carry-on and checked luggage. Creatine, whether in powder or capsule form, is not considered a restricted substance by the TSA or most international security agencies. If you're carrying creatine powder in your carry-on and the quantity exceeds 12 ounces (about 350 milliliters), it may need to be removed from your bag and placed in a separate bin for additional screening at the security checkpoint. To avoid delays, it’s best to keep it in its original packaging or clearly labeled containers. There are no quantity limits for creatine in checked baggage, making it a convenient option for transporting larger amounts.