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10.1016/j.ijbiomac.2021.05.073 49 JiaY.ZuoD.LiZ.LiuH.DaiZ.CaiJ.et al (2014)

The symmetry of results across left and right cheeks, forehead, and chin all within a narrow range reflects a systemic, whole-face effect consistent with an orally administered supplement acting through the bloodstream rather than a topically applied product

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The study found that, among men with infertility, low vitamin B12 was linked to a higher risk of testosterone deficiency and impaired androgenic hormonal profiles that impact sperm production, and hence fertility