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Some people may experience mild soreness at the injection site

1 to 3 Months: Neurological symptoms, such as tingling or memory issues, often start to improve

Increases energy levels and concentration Improves metabolism and aids with weight loss Boosts the immune system Helps improve sleep patterns Helps certain types of hair loss Lifts mood and helps with depression Improves memory Prevents heart disease What food do we find B12

In these cases, you may receive a prescription for the individual B vitamin rather than the entire B complex

Data availability Individual participant data that underlie the results reported in this article will be available from 9 to 36 months following the publication of this article

This is different from prescription weight-loss drugs that might work by suppressing appetite or altering brain chemistry