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Since then, many sellers have pivoted to personalized formulations that add ingredients such as vitamin B-12 and argue the result is not essentially a copy. But FDA said on April 1, 2026 that a compounded product combining semaglutide and another active ingredient such as vitamin B12 may still be essentially a copy unless a prescriber documents a patient-specific significant difference. In March 2026, Eli Lilly has warned against the practice of compounding tirzepatide with vitamin B-12

doi:10.1080/14756360802610761

PKA, protein kinase A

They also make your body more resistant to insulin and can increase inflammation, both of which get in the way of how well GLP-1 works