If something is interfering with absorption, or your levels are low and need correcting, an injection is usually the more reliable route
Oral B12 has only about 1 to 2 percent absorption, while injections are absorbed at 55 to 97 percent
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Informal reports sometimes describe body-composition changes after 4 to 6 weeks, but these reports are not controlled evidence
When adverse reactions do occur, theyre often the result of a problematic substance in the product, for example carboxymethyl cellulose, mannitol, or benzyl alcohol
Early research is mostly preclinical, so it should not be treated as a proven anti-aging or fat-loss treatment