b12 monthly injection dosage Shots for Adults: How Much and How Often Best Vitamin B12 Injection Dose
Description
B12 injection doses can range from 100 mcg to 1,000 mcg, depending on the person, their age, and their condition

Scalp serums are usually easiest to apply at night or when you have time to massage them into the scalp

However, its still best to supplement under medical guidance [*]

(PubMed) Hooshmand B, Solomon A, Kareholt I, et al

No GP referral is needed

However, for those with more severe deficiencies, it might take a bit longer or require a series of injections to fully replenish their stores and experience the full benefits
