Nat Rev Endocrinol 22 , 383384 (2026)
The ability to absorb vitamin B12 from food often decreases with age
This mechanistic complementarity is the physiological basis for the synergistic GH response observed with the combination protocol

Common side effects include: Gastrointestinal issues: Nausea, vomiting, constipation, and abdominal pain Injection site reactions: Redness, swelling, and pain Systemic issues: Fatigue, indigestion, heartburn, belching, and hair loss More severe side effects include: Thyroid problems: Medullary thyroid cancer and pancreatitis with severe, persistent abdominal pain Gallbladder problems with symptoms such as upper abdominal pain, fever, jaundice, or clay-colored stools Increased risk of hypoglycemia with symptoms such as dizziness, sweating, confusion, and shakiness Severe vomiting that leads to dehydration and kidney problems Mental health concerns such as depression and suicidal thoughts Vision changes from rapid changes in blood glucose levels Some patients should not use Zepbound, such as those who have or are at risk for medullary thyroid carcinoma or multiple endocrine neoplasia syndrome type 2
Osawa S, Kawamori D, Katakami N, et al
This constant experience of the game allowed players to totally fulfill and customize, almost, the role of Gordon, whilst letting them know who they were playing as