Yes, Ibutamoren MK 677 is legal. Its legality varies from country to country and or region to region. As of 2017, it was still in the preclinical stages of development and for the purpose of growth hormone deficiency. It has not been approved in the US and soon it will be. The problem here is not legality but simply that of approval. YK11 is another powerful muscle mass drug and soon to be approved worldwide. Buy with confidence and try to avoid purchasing fake.