Heartburn on peri-rx

Does anyone else get heartburn from peri-rx? I’ve started noticing it 6 hours after I take it on lifting days.

any alternatives or anidea of which ingredients may cause hesrtburn? I haven’t had anany issues with creatine, but that was the only supplement I had been taking before.

I only use it on lift days 3x a week.

thanks!

Update. Maybe it’s the vanilla Whey Rx. Gah! Trying to figure out what is causing this heart burn