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For some reason, and I can find no scientific basis for this, that recommendation was changed in 1974 to an injection every two months and then in 1984 to every three months

Pinch it between the fingers and thumb of one hand

Read More Vitamin B-12 Provides an efficient way to boost your B-12 levels

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Example Imagine administering insulin with a needle meant for intramuscular vaccines

However, it may only work if you are deficient or inadequate in vitamin B12 or have a chronic health condition, like myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) or megaloblastic anemia (see next point)