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People with vitamin B12 deficiencies are more prone to health conditions that involve red blood cells, including anemia, and other side effects like an impaired immune system

The direct route means effects are often felt much faster than with oral intake

M., Sndergaard, C

Oxidative stress occurs when there is an imbalance characterized by the overproduction of oxidants, reduction in antioxidant levels, or both

Though it differs a bit from one person to another, the effects of B12 vitamins usually last around 48 hours to 72 hours after the initial injection

Symptoms often include fatigue, dry skin, and unexplained weight gain