Xerendip made by Pisa in Guadalajara Mexico is a human growth hormone (HGH), somatotropin rDNA, 191 amino acids, polypeptide chain. It is the exact same structure as all are other HGH (Humatrope, Saizen, Norditropin, and Protophin). But like Protophin, Xerendip is only manufacturer here in Mexico, therefore the price is a lot cheaper than the other HGH products. Xerendip can last at least 3 weeks in non-refrigerated temperatures. Xerendip must be shipped from Mexico using Mexpost/EMS, and can not be shipped next day. Mexpost/EMS shipping generally takes 10-14 days.