at what level should you get b12 injections Shots Dosage for Adults: How Much and How Often Vitamin B12 Injections Dosage and
Description
The FUT2 secretor variant p.Trp154Ter influences serum vitamin B 12 concentration via holo-haptocorrin, but not holo-transcobalamin, and is associated with haptocorrin glycosylation Hum Mol Genet 2017;26:4975-88

To get the best results, stick to the recommended doses and ways to get them

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No published human trials