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Methylation reactions are essential for the metabolism of components of the myelin sheath of nerve cells, as well as for synthesis and metabolism of neurotransmitters (22)

Although some of the supplement doses are very high (for instance, 500 or 1,000 micrograms when a healthy adult only needs 2.4 micrograms per day), your body only absorbs what it needs and pees the rest out

According to a study in The American Journal of Clinical Nutrition , nutrients delivered via injection have a much higher absorption rate compared to oral supplements

The frequency of B12 injections depends on your individual health needs and vitamin B12 levels