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A few people notice temporary soreness at the injection site or mild flushing that fades quickly
B12 is a key player in the production of the mood-regulating chemical serotonin and when your body is lacking the vitamin, production can decrease
Unknown Important limits These groups are not covered by established human research and should not be treated as proven safe-use groups
References Kraus, D., et al
For B12 to be absorbed properly, your stomach produces intrinsic factor, a protein essential for uptake
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