b12 injections or supplements Are Vitamin Shots Right for You? B12 Injections vs Pills: Richmond's

A lot of the actual vitamins you take orally through diet or supplementation are broken down before they enter your bloodstream

Gastrointestinal upset and transient anxiety have also been documented in clinical observation

People over 50 years of age may show neurological changes due to vitamin B12 deficiency, resulting in an increased incidence of nervous and mental disorders among the elderly

And, as mentioned above, compounded semaglutide products (with or without B12) are not held to the same standards as FDA-approved drugs

Nat Rev Dis Primer 7:47 Aasheim ET, Hofs D, Hjelmesth J, Sandbu R (2008) Peripheral Neuropathy and Severe Malnutrition following Duodenal Switch