The concern is that discolored product could indicate reduced effectiveness over time
Borchert A, Kalms J, Roth SR et al (2018) Crystal structure and functional characterization of selenocysteine-containing glutathione peroxidase 4 suggests an alternative mechanism of peroxide reduction
How to prevent vitamin B12 deficiency Vitamin B12 deficiency due to diet is rare in the U.S
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J., Hagel, E., Dauth, W., & Raithel, M
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