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Check out this video to learn how they work and decide if they are right for you

The good news is that some people notice improvements within a few days, particularly if they have a significant deficiency

While theres no definite cutoff for when B12 starts to become unsafe, because people often ask, well somewhat arbitrarily say not to take more than 1,000 g per day over the long-term without guidance from a physician

The body excretes excess B12 through the kidneys, and no Tolerable Upper Intake Level exists because B12 toxicity from dietary sources is extremely rare

Insurance Coverage and Accessibility How much insurance covers B12 shots can really vary