The effects of a B12 shot can last anywhere from one week to several months, depending on individual needs, metabolic rate, and underlying deficiency severity
Potential risks include mild side effects like nausea from NAD+ infusions, but overall profiles are favorable.[40] Who Benefits Most from Combination NAD+ and 5-Amino-1MQ Therapy
While all studies adequately ascertained exposure and ensured comparability between outcome groups by controlling for confounders, 42% (n = 5) did not provide adequate sample representativeness and size, and 17% (n = 2) did not report the non-response rate
After that it slowly disappeared because it became more and more difficult to obtain radioactive B12 suitable for human use, and at the same time less and less acceptable to use radioactive B12 in a diagnostic test
Are B12 injections safe, and do they have any side effects