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Together and especially if two or three show up at once with no other clear explanation they're worth paying attention to

Clinical evidence comes in tiers: mechanistic studies (does the molecule do what it should at the cellular level?), animal studies (does it produce the expected effect in a living organism?), and human trials (does it actually work on the people who will use it?)

B12 deficiency can occur for several reasons, including- Dietary Restrictions- People following strict vegetarian or vegan diets may not consume enough B12-rich foods, leading to deficiency

10.1007/s10616-021-00514-y 202 PangH.ZhouY.WangJ.WuH.LiuX.GaoF.et al (2021)
