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The reasoning behind this restriction ties back to concerns about cardiovascular effects and the potential for tolerance, where the drug becomes less effective over time as the body adapts to elevated norepinephrine levels

Protect from Light: Store the vial in a dark location at all times, as cyanocobalamin breaks down quickly when exposed to direct or UV light

You've done the cardio

What Is a B12 Injection and Why Might You Need One

And the extra cushioning typically means less pain

With a clean setup, the right needle, a well-chosen injection site, and a slow, confident push of the plunger, home administration becomes routine