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These compounds contain cobalt in a corrin ring

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The body absorbs only what it needs

Oral supplementation is usually sufficient for individuals with mild to moderate deficiency due to dietary insufficiency or malabsorption disorders

Inverse Association Between Serum Vitamin B12 Concentration and Obesity Among Adults in the United States Obesity in children and adolescents was associated with an increased risk of low vitamin B(12) concentration

Some weight-loss clinics offer vitamin B12 injections as part of their weight-loss programs