My CFS always had a particular pattern in the very beginning (20 years ago). I was cold, stiff, I had low body temp (70 F and below), I got dizzy when I stood up, and my mouth was dry. This of course devolved into worse things. I finally got rid the of the CFS using a natural vasodilator (berberis vulgaris) and sometimes I still need this (like if I've just battled the flu and my body is exhausted) but on a normal day...... On a normal day I find that elemental sulphur under my tongue warms me up when my body temp drops. Much of the sulphur goes directly into my circulatory system if I take it under my tongue (homeopathically) so maybe that's why it works so quickly to warm me up. I haven't tried taking MSM pills but certainly I've tried taking tons of sauerkraut juice and it didn't do much. Dandelion root taken with meals helps me the most with digestion and overall inflammation. (joints/liver/etc.) I take half of what the bottle recommends. H2S is needed for healthy circulation - I think it is aided by NO2 gas.The internet says H2S helps with circulation by making blood vessels more elastic amongst other things. Without this you get blood pooling in your vessels. Homeopathy says basically the same thing - sulphur is taken to treat engorgement in your liver (which blocks bile flow). That's why the dandelion root helps too. You guys can correct me if I'm wrong but that's what I got out of all my reading.