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For those with Vitamin B12 deficiency, injections are an effective means of rapidly increasing blood oxygen levels, often in a noticeable boost in energy
Rapid rise in the blood: Within hours of the injection, the B12 level in your blood rises significantly, giving your body the raw material it has been missing
Homocysteine Lowering B Vitamins: B12 Shots & B12 Injections: Investigating the Good, Bad, and Alternative
There has not been a UL (upper intake level) established for B12 because it is not stored in your body and therefore, can not build up enough to cause serious adverse side effects for most people
It is found mostly in animal products, and absorption from food requires intrinsic factor produced in the stomach
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