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Amino acids are used by the body to build proteins

Taking large amounts of vitamin A can as well

However, in many studies with limited information available on the clinicaltrials.gov website, it was not clear which chemical form of the selenium was used, especially when selenium was part of multi nutrients containing various vitamins, minerals including selenium, but no specific chemical form of selenium was mentioned making it even harder to establish preferred chemical form of Selenium

The effects of the oral supplementation of L-Cystine associated with reduced L-Glutathione-GSH on human skin pigmentation: a randomized, double-blinded, benchmark- and placebo-controlled clinical trial