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Description
Some people need a quick energy boost every week or two, while others do best with monthly maintenance

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(4) Yue X, Liu SL, Guo JN, Meng TG, Zhang XR, Li HX, Song CY, Wang ZB, Schatten H, Sun QY, Guo XP

We often see a lack of vitamin B12 in many vegans or vegetarians as b12 is usually found in animal products
