Vitamin B-12

Vitamin B-12 is supplied by BioLifeLab, sealed in a tamper-evident vial and stated at 99% purity on the label. It is available in 3 ampoule sizes (0.5 mg/ml, 1 mg/ml, 10 mg/ml), so the size can be matched to how much material a study will consume before the vial is opened again. Store sealed vials between 2 and 8 °C in a cool, dry place away from direct sunlight; stability drops sharply once a peptide is reconstituted, so prepare only what a protocol needs.