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Intramuscular administration of vitamin B12 is often preferred for its rapid improvement in patients with severe deficiency or severe neurological symptoms

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

Pharmacies with immunization services may also provide supervised B12 injections after an online consultation. At locations such as CVS MinuteClinic, licensed providers review your medical history, confirm that B12 injections are appropriate, and then administer the injection on site. This option can be convenient for patients who need ongoing injections and prefer easy access, extended hours, and transparent pricing

The standard guideline is a maximum of 28 days after the first puncture