Just had a shake about 2 hours ago and no problems.... I took it with food this time. That's what I'll do just take it with food and see how that works for me. Tommorow will be another experiment day. Still though I'll just take 1 scoop for breakfast with food and another scoop post workout with food and 2 scoops before bed. That's still 70 grams of extra protein a day. We'll see what happens tommorow. Still going to purchase Perfect RX though.