After preparation: Store prepared solutions at 28 C where compatible with your SOP, protect from light, and avoid repeated temperature cycling
The honest answer is that neither ingredient universally wins
MS analysis was performed with an electrospray ionization (ESI) source on an Agilent 6430 QQQ LCMS/MS
Analysis of selenoproteome characterized the functions and sequence of 6 glutathione peroxidases (GPXs) in mammals: cytosolic GPX (cGPX, GPX1), the first identified mammalian selenoprotein (6,15), phospholipid hydroperoxide GPX (PHGPX, GPX4) which was first described in 1982 and later verified as selenoprotein by sequencing (21,22), and other sequenced plasma GPX (pGPX, GPX3)(23), gastrointestinal GPX (GI-GPX, GPX2)(24) and, in humans, GPX6 which is restricted to the olfactory system (19)
E., Li, H., Giovannucci, E., Lee, I