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Alternatives: Are there better-established options for what I am trying to achieve

This article discusses how B12 deficiency can affect females, its causes, the sources of B12, and how doctors treat a deficiency

I know this is an old post but it has helped explained one or two things that have been puzzling me

Gross, A

Ryan-Harshman M, Aldoori W

Dietary Deficiency: If your deficiency was purely due to diet (e.g., a vegan not supplementing) and youve since adjusted your diet or started regular oral supplements, you might eventually be able to space out injections more or even switch to oral maintenance, though this should always be carefully managed by your GP