Transtropin 80 IU Kit , HGH stimulating peptides and HGH (somatropin 5.33 mg) equivalent to 16 IU vial , has the ability to promote the release of human growth hormone. The only difference is that HGH stimulating peptides are able to promote natural HGH release. Somatropin on the other hand, while it is able to increase HGH levels, promotes unnatural HGH production. It also suppresses the functioning of the pituitary gland causing the organ’s deterioration. Its ability to suppress the pituitary’s functioning makes HGH releasing peptides a better choice.