A deficiency in vitamin B12 is the most common nutritional deficiency in patients who have had gastric bypass surgery (114), but deficiencies of folate, pyridoxine, thiamine, vitamin D, copper, zinc, iron, and calcium may also occur (202
After 4 weeks, the doctor will likely increase the dose to 5 mg, still once weekly
Watch the full podcast episode here: YouTube Video on Peptides Update July 13, 2026 Since this article was originally published, Weight Loss & Vitality has begun offering this peptide in select clinical circumstances when it can be legally prescribed and dispensed through an appropriately licensed pharmacy
semaglutide for obesity, glycaemic control, and cardiovascular outcomes: a narrative review of clinical trials
Preclinical literature describes it as a peptide involved in maintaining tissue integrity, modulating microcirculation, and the biological response to different types of cellular stress