glutathione peroxidase selenium Elemental Exploring the Link between Oxidative
Description
There may be many explanations accounting for this difference

Neuropharmacology 43: 10151025 doi:12423671 [DOI] [PubMed] [Google Scholar] 18

Bohets HH, Nouwen EJ, De Broe ME, Dierickx PJ

Pharmacology and Potential Implications of Nicotinamide Adenine Dinucleotide Precursors

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It may cause mild side effects like stomach upset or nausea
