how long do vitamin b12 injections last Are Shots Safe? Royal Palm Beach Medical Group How Long Does a Vitamin

Because the injection bypasses your digestive system, your body can access the B12 quickly instead of waiting for absorption from food

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That storage is one reason people with a deficiency sometimes feel the benefit for a longer window than someone using shots for simple upkeep

Any Side Effects to Know About

You may feel the noticeable effects for about one to two weeks, but traces of the vitamin can linger longer because your liver stores some of it