I currently use Optimum Nutrition, both whey isolate and casein. I've been using them for about 9 months now. Since about 2 months ago they've been making me have unbearable farts. Constant and paint-peeling. My food diet has not changed.
Im getting low on supplies and am about to order some more. Any recommendations?
Protein doesn't make me gassy at all. Does yours have lactose?
They both state they contain milk and soy, and lactase.
I'm going to stop using the casein for a few days and see what happens. If no changes, then I'll only use the casein and stop the whey isolate and see what happens.
Try reducing the amount of protein you take, or spread out the dosage. I take protein, Optimum Casein, as a meal replacement but slightly less than a full serving and don't have a problem with gas even being lactose intolerant.