Protein powder is not prohibited for transportation on a ship, because protein powder is not a medicine, but is a regular sports supplement. Also, various peptides can be transported on board, which are already protein supplements, I learned about this at https://paradigmpeptides.com /, and then I began to carry these pills with me and take them with food. This remedy helps to build muscle due to its high protein content. There are gyms on board the ship, and therefore these pills and protein powder will be very useful. Although they are for different purposes, however, both vehicles are allowed for transportation. I wish you a successful trip, take care of yourself!