GIP can be an incretin that is secreted within the proximal tiny intestine from the presence of nutrients during the intestine. GIP was very first named gastric inhibitory peptide as it was imagined to lower gastric acid secretion; even so, afterwards research demonstrated that its key effect is stimulating insulin https://drive.google.com/drive/folders/19v5zdnKh9DL51CFR2jGZXN3OTiFtBYbV?usp=sharing