Can too many electolyte supplements be dangerous? I know riding and drinking only water can potentially lead to dangerous Hyponatremia or minor issues like muscle cramping. So I often supplement with electrolyte pills in my water like nuun or gu-brew, especially on long rides in hot weather and when doing multi-day tours.

Can too many electrolyte supplements be dangerous?  Is there a ratio or formula to follow to make sure I'm getting enough electrolytes, but not too much?
Yes, too many electrolytes can do all sorts of bad things to you.

Good article here: http://www.livestrong.com/article/521763-can-you-consume-too-much-electrolytes/

The U.S. Army has done a lot of research, here's probably the most pertinent paper: http://www.ncbi.nlm.nih.gov/pubmed/10410838

In general, if you are mixing the drinks according to the directions, you won't be too wrong. Most will be a more natural mix if you mix according to directions then dilute 1:1 with water.

Happy Riding.