how do you feel after a b12 injection Feeling worse Injection: Answering concerns Common & Rare Side Effects

Introduces residual gastric content that slows emptying and dilutes peptide concentration

Human studies have shown that PYY delays gastric emptying and promotes satiety (165), while short-term intravenous administration of PYY3-36 , at doses generating physiologic postprandial blood excursions, was shown to decrease calorie intake by approximately 30% in lean and obese subjects, without causing nausea, affecting food palatability, or altering fluid intake, nor was it followed by compensatory hyperphagia (166)

When you have a B12 shot, the B12 is immediately absorbed into the bloodstream

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Some patients experience intolerable GI side effects or cant use GLP-1 drugs due to medical contraindications