Yes, creatine is legal to take on a flight in the UK the USA and pretty much all countries, but there are specific regulations you need to follow.
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Pack right and carry-onIf the original container is less than 12 ounces (350ml) of powder, you can pack your protein in your carry-on without worry. However, TSA will require any powder or supplement containers greater than 12 ounces to be placed in a separate bin for screening at airport security.
Yes, you can take pre-workout supplements on a plane in the United States. Pre-workout supplements are classified as “Protein or Energy Powders” by the USA Transportation Security Administration (TSA). If you are traveling with less than 12 oz. / 350 mL, you can leave them in your carry-on bag during airport screening.