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Vitamin B12 is water-soluble
Proponents of B12 shots state that they turbocharge the metabolism (make you thinner), strengthen the immune system, and help cure fatigue, insomnia, and even depression
synthesized by certain bacteria Although the intestinal flora of humans is able to synthesize vitamin B 12 , humans are not able to absorb bacteria-generated vitamin B 12 since the location of synthesis (the colon) is too distal from the location of absorption (the small intestine)
A simple blood test can show if your levels are normal
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