b12 injections side effects nhs How Long Does It Take Vitamin to Work? Vitamin B12 injections for fatigue

If results plateau at 400mcg after four weeks, consider 500mcg for the remainder of the cycle

This is because Vitamin B12 is essential for making red blood cells, which carry oxygen to your muscles and organs including your brain

Vitamin B12 injections play an essential role in helping your brain to function better and the production of DNA as well as red blood cells, which can be very effective especially to those who live by a vegan or vegetarian diet lifestyle, as their diet does not contain the natural vitamin B12 supplements needed in their foods that they regularly consume

Avoid repeated freezethaw cycles