This board is HOPEFULLY full of people who are intensely involved in anaerobic (weight/sprint/etc...) training and I will say +/- aerobic training. Not assumed as the generally sedentary lay-population used in said studies unfortunately.
The rationale is the same reason I hate when people try and apply suggested data on Vitamin E (especially when solely alpha-tocopherol is used as monotherapy).
Anyway; one must consider the amount of free radical generated on a daily basis (each time you go to the gym, each time you put something in your mouth - healthy or otherwise, oxidizing fat en route to a svelte physique you hold dear, and so on...EVERYTHING generates free radicals). Vitamin E works in synergy with the endogenous antioxidant glutathione to quench lipid peroxidation. But to do so, glutathione needs selenium which "holds" lipid radicals so that glutathione can get a crack at them. Selenium is also required for vitamin E to function properly.
NOW - ANYTHING (statin drugs, niacin, etc...) that modifies lipids (cholesterol, et al...) WILL alter glucose metabolism to some degree. Its funny how frequent this is forgotten especially by the authors of silly studies suggesting increased incidence of insulin resistance and/or diabetes development when not using clamp studies, but alas I digress.
Its not much use, however, taking selenium, if you don't have enough glutathione in the first place. Intense exercise (granted, probably 95% of gym-goers, and possibly even a good percentage who read these boards do not really embark on truly "intense" exercsie can deplete muscle glutathione by 40% and liver glutathione (from which the muscles get their refills, like glycogen) by 80%! So, rightfully so - I probably should have suggested some conditions with the dosing of selenium:
1. Barring you are truly doing "INTENSE" exercise (defined in anaerobic training as HOW close you lift to your 1RM, not by speed...there is a speed component in transitioning from aerobic to anaerobic in what is generally thought of as cardio - a shift from a jog to a sprint).
2. Fat oxidation is truly something being incorporated into your physique regimen (both on a microscopic level: if you have not had a NMR analysis by Lipo Science and evaluation of your Lp(a) and Homocysteine scores; you won't really be able to identify this -AND- on a macroscopic level: your outward phenotype).
3. You are somehow regenerating glutathione lost with exercise (which people don't generally put a lot of credence on). What I may have qualified my statement with is use of the generalized antioxidant stack: Selenomethionine + NAC + SAMe (with B Vitamins as co-factors), but there are very few products that would supply this in what I feel people really need.
While selenium supply isn't necessarily a bad one with most people's diets - let's take bodybuilder modifications: low-carb, cyclical macro, hyper- and hypo-caloric, etc... BUT also consider that selenium is NOT as well-defined in soil and farmer's don't turn profit enough to give a damn on replenishment.
But, I do appreciate you keeping me honest here. I more than likely should have said that #10 was collectively: Selenomethionine + NAC + SAMe (or TMG I suppose as "poor man's SAMe") + B vitamins (but Bs were already coming in at #1 for so many different co-factor reasons) and barring exercise intensity was up to par (recall that you will harbor some level of insulin resistance - even non-diabetic with as littel as > 48 hours of inactivity; the studies illustrated are not ideal to apply to most I would hope to campaign for on this board.