Herbs can also have interaction with medicines, so Prime TRT see a medical doctor earlier than starting an natural penis supplement. Vitamins for the Penis Finally, permit's speak about penis supplements inside the shape of vitamins. Naturally taking place within the body and in nature, nutrients are a super choice for giving the trouser snake a little "oomph." There are a few vitamins and amino acids that display promise in supporting a man experience extra firmness and hold it longer.