b12 injection take effect Vitamin Side Effects and Safety How Quickly Do Vitamin B12

When your body lacks enough B12, it cannot produce red blood cells efficiently, which may lead to anemia

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As a note, this is the recommended dietary allowance (RDA), which is often the bare minimum of a nutrient necessary for function

Hydroxocobalamin 1 mg/mL solution for injection Summary of Product Characteristics

Its essentially a fast-acting hydration solution that replenishes all the fluids you need to ward off infections and boost your energy as well as making your blood cells work properly, carrying oxygen around the body and boosting your energy and mood and relieving symptoms of fatigue

There may have been other things in the mix such as Iron etc, but its highly unlikely there's a B6 toxicity issue