vit b12 injectable medication Cyanocobalamin Injection, 2mg/mL How Its Sold 100 mL or 250 mi vial Special Precautions Keep away from children and animals Cobalife™ VB12 Injection for Sheep

I am not a chemist but B12 does seem to be an inherently stable molecule, not least indicated by the fact that the boxes of it have long shelf from production dates on them

While supplementing with up to 2,000 mcg of B12 is considered safe for treating deficiencies, it is advisable to consult a healthcare professional to determine if supplementation is necessary, especially if you are taking medications or are pregnant

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A sort of fluorescent green shortly after injection then fades back to normal Not what you're looking for