b12 for injection Are Vitamin Shots Right You? What Color is Vitamin B12

18 Table 4 Time to Improvement of Abnormalities in Vitamin B12 Deficiency After Initiation of Treatment A 2005 Cochrane review involving 108 patients with vitamin B 12 deficiency found that high-dose oral replacement (1 mg to 2 mg per day) was as effective as parenteral administration for correcting anemia and neurologic symptoms

B12 deficiency can also cause water retention, constipation, muscle weakness, fatigue, and weight loss

At this point, there is insufficient evidence to recommend B12 supplementation for fatigue beyond correcting a deficiency

Some researchers believe that fibromyalgia amplifies painful sensations by affecting the way the brain processes pain signals

European Journal of Nutrition