PLoS ONE, 10 (6), e0130040
Stacking typically means using two or more peptides in the same time window to pursue a combined outcome (fat loss + muscle preservation, recovery + training capacity, etc.)

Individuals with any of the following conditions should consult with their healthcare provider before use and may not be eligible for treatment: Personal or family history of medullary thyroid carcinoma (MTC) or Multiple Endocrine Neoplasia syndrome type 2 (MEN2) Known hypersensitivity to GLP-1 or GLP-1/GIP medications or any formulation components, including additives such as vitamin B12 or cobalt Pregnancy or plans to become pregnant (therapy should be discontinued at least two months prior to planned pregnancy) Diabetic ketoacidosis (DKA) or type 1 diabetes Severe gastrointestinal disease (including gastroparesis or active inflammatory bowel disease) Severe cardiovascular disease (including unstable coronary artery disease or heart failure) Recent bariatric or gastrointestinal surgery within the past six months Active cancer currently undergoing chemotherapy or radiation treatment This list is not comprehensive

Kaibori M, Inoue T, Oda M, Naka D, Kawaguchi T, Kitamura N, Miyazawa K, Kwon A H, Kamiyama Y and Okumura T (2002) Exogenously Administered HGF Activator Augments Liver Regeneration through the Production of Biologically Active HGF