When I used to race road bikes I drank Gookin ERG (Basically pedialyte made isotonic with glucose). It was developed by a marathon runner in the 60's who analyzed the sweat of other runners! When I used it, I would gulp down a slug before starting up a hill, and then at the beginning of 'burn' in my legs. Drove the pain away very quickly, and minimal soreness the next day.
Forty years later my son's entire ice hocky team raves about the stuff and how much stronger they feel 3rd period and the next day - they have abandoned their other sport drinks. I am not competitive any more (except maybe at the dinner table

) , but here is the site if anyone is interested:
http://www.gookinaid.com/ERG_Specs/erg_specs.html
PS, I keep a packet around to mix up during flu season!
__________________
John
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E