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T., Branco V., Vale F

Conclusions Athletes should regularly monitor their blood vitamin B 12 concentration and, if necessary, adjust the oral supplementation individually to achieve the zone of 400700 pg/mL

Lancet 358 , 17541759 (2001)
Rotate sites systematically (abdomen at least 2 inches from navel, thighs, upper arms) to avoid lipohypertrophy [8]
