I will say, the first beer I was involved in was made with a pack of the Gold coopers yeast and it is far from quality. it throws all sorts of off products in there, ime. Now making you sick, not sure about that one...
Brian-BJCP Grand Master/Mead Judge
HOPS! Homebrewers' Pride of the Southside
Current: Mead-Blackcurrant, Coffee Metheglin, Vanilla Chile Metheglin, Mojito, Macadamia Blossom Trad, Carrot Mead, Grapefruit Ginger, Dry Tupelo Trad, Elderberry. Beer- Exportbier, Am. Brown Ale, Märzenbier, RIS, Doppelbock, Mosaic-Golden Promis SMASH, Bramling Cross Strong Bitter