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One common question that arises is, "How long do the benefits of a vitamin B12 injection last?" The answer can vary from person to person based on factors such as metabolism, overall health, and the severity of B12 deficiency
The rationale rests more on theoretical benefit and observed clinical patterns than controlled trial evidence
Six trials totaling roughly 900 participants are summarized in Stier et al
Some might need injections every two weeks, while others might do fine with less frequent ones
Talking with your healthcare provider can help you determine if B12 supplementation is right for you and, if needed, which form of supplementation is best for you
However, tiredness can have many causes, so persistent low energy should be checked properly
