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A small number of observational studies have examined selenium status and male fertility or sexual function, with mixed findings

46 While ID typically causes microcytosis and vitamin B12 and folate deficiencies cause macrocytosis, the co-occurrence of these deficiencies may obscure clinical features and complicate diagnosis, leading to underestimation of the prevalence of iron, vitamin B12 and folate deficiencies

Unlike some other forms of Vitamin B12 that require metabolic conversion before becoming active, Mecobalamin is immediately available for use in many physiological processes

doi:10.3389/fendo.2021.683040 Farsinejad-Marj M, Azadbakht L, Mardanian F, Saneei P, Esmaillzadeh A