at what level should you get b12 injections Shots Dosage for Adults: How Much and How Often Sublingual B12 vs. B12 Injections:

This treatment is ideal for individuals seeking quick recovery after a night out, travel, or dehydration

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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

Strong evidence, from decades of treating individuals with inborn errors of B 12 metabolism, supports the safety of parenteral, lifelong, even high dose hydroxocobalamin, sometimes even at very high doses.6768 Long term epidemiological studies also indicate that treatment with pharmacological B 12 doses and the corresponding increase in serum B 12 do not increase mortality.69 Data on the safety of cyanocobalamin, when administered with high frequency (ie, one to two times a week) for a longer period of time, are lacking

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Getting the Best of Both Worlds Some people use combination approaches monthly shots plus daily supplements to maintain steady levels while minimizing needle time and cost