do b12 injections affect periods Vitamin for Aging and Longevity I got a b12 injection
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Biochimie 125 , 259266 (2016)

Some people, particularly those who were severely deficient, report a sudden improvement in energy, focus, or mood within 24 to 72 hours
Great B12 Supplement From UndisclosedComments about Rx B12 Forte, 2oz Oral LiquidLove this supplement
This is most true for breast cancer patients

Energy is consistently better