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The question of weight regain following retatrutide discontinuation is not yet answered in published data

Tell your doctor immediately if you experience any of the following symptoms after you have been given the injection

If vitamin B12 is ingested in its free (or nonprotein bound form), it will bind to a carrier protein known as R-binders or transcobalamin I that is secreted by both the salivary glands in the oropharynx and the gastric mucosal cells within the stomach.1,2,8 The free vitamin B12 ingested by mouth will remain in the bound form with an R-binder until it reaches the second segment of the duodenum in the small intestine

doi: 10.1083/jcb.200210169