is a b12 injection im Best Vitamin Sites B12 Shots vs. IV Infusions:
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Desired injection dose (mg)
What else should I know about Cyanocobalamin (Vitamin B12) Injection

A steady drop in NAD+ production and a faster rate of NAD+ depletion, both of which reduce the amount your cells can actually use
Can I make an order for someone else

There is no established tolerable upper intake level (UL), so even high-dose injections are safe because your system simply eliminates what it cannot use
