Does anyone have a list of those supplements to be taken on an empty stomach vs those to be taken with food? What about those that should be taken together vs those that shouldn't be taken together?

What supplement were you interested in? You're too vague.

I just go by common sense. First, go by the directions on the bottle. If there aren't any, then it depends on what its purpose is. If I'm taking something like R-ALA and ALCAR, then I'll do them both on an empty stomach so they'll make it into my bloodstream around the same time frame and can work their synergism. I also take R-ALA on an empty stomach before meals so that its nutrient partitioning is taking effect right about the time I'm loading up on macronutrients. Same goes with fat-loss supplements-- they're a mix of synergistic ingredients, so even if it doesn't say to take them on an empty stomach, I do.

On the other hand, I tend to take things intended for general dietary supplementation (multivitamins, my vitamin E, minerals, sesathin, fish oil, and so on) with my meals, firstly because a multivitamin on an empty stomach doesn't sit well with me, and secondly because the timing of the nutrients isn't that important. There are exceptions to this, like with ZMA, because the interaction of the zinc and magnesium for promoting deep sleep is based on their timing into the bloodstream, but it's my rule of thumb.

Basically, if the timing matters, I go on an empty stomach. If not, I take it with meals. Personal stomach comfort overrules either of these, though.

Actually, the post was meant to be vague - I'm not concerned with any specific supplement - but groups of supplements that fall into these categories.

For example, I've heard that certain supplements should be taken together (e.g., Alcar, Tyrosine, (DMAE?)) on an empty stomach, and others should be taken with food (e.g., 1AD). I've also heard that certain supplements shoudn't be taken together (ZMA and Calcium), while others should (Vit E and selenium). Most of this seems a bit arbitrary, but I'm sure there is supporting data.

So, does anyone have recommendations for combinations, supplements not to take in combination, and more generally those to be taken with food and those better taken on an empty stomach.