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"Could it Be B12?: An Epidemic of Misdiagnoses" by Sally Pacholok and JJ

Similarly, caffeine can interact with the absorption of B12, as it influences the digestive system and might exacerbate feelings of discomfort post-injection
For laboratory research only

Since the liver is the major site of IGF-1 production, when steatosis develops lowering insulin sensitivity, the severity of steatosis at different stages of insulin resistance and metabolic syndrome seems to be correlated with worsened circulating IGF-1 levels [234]
As your body absorbs B12 oral supplements and B12 injections in different ways, a dose of 1,000mcg of B12 taken orally is not equivalent to a B12 injection of 1,000mcg
Regulation of SIRT1 in cellular functions: role of polyphenols
