The Association Between Psoriasis and Trace Element Serum Levels and Dietary Intake: Results from USA National Health and Nutrition Examination Survey 2011-2014.

27 , 28 Yang et al 29 found that at higher Se-intakes the whole blood Se-level became less sensitive than the levels in tissue, including finger-nail and toe-nail, and confirmed a highly significant correlation between the Se-intake and the tissue-Se level, and also between the Se levels of various tissues, which the authors thought is convenient to convert the known tissue-Se level to the corresponding Se-intake. 29 Li et al 26 found that Se intake was obviously, the strongest predictor of Se concentration in tissues.

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