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The injection is providing you with the necessary B vitamins regardless of your food intake, which is helpful especially if you have trouble eating a balanced diet (due to illness or other reasons)

In contrast, the long-term use of artificial cyanocobalamin supplements does not have a direct biological effect and must first be converted in the body into one of the three natural forms of B12

Frequency varies based on individual needs, but weekly or biweekly sessions are common for optimal results

This product is supplied strictly for controlled in-vitro laboratory research use only by qualified research professionals in certified laboratory facilities

PMID 38673453

The absorption is very efficient in the distal ileum (enterohepatic recirculation)