how long for vitamin b12 injection to take effect Quickly Does Shot Work? Does It Help Lose Weight? Common & Rare Side Effects
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others might provide an injection based on symptoms alone

After 12 weeks, when the subjects were examined, the group presented with the minor concentration appeared to exhibit the highest reduction in subject body weight (up to an average of 2.8 kilograms)

(9) Rudolphi B, et al

The uMMA test may be more useful than the serum MMA test, because people with B12 deficiency and neurological damage excrete significantly more uMMA than those without damage
