my sister would also get bad headaches from it; she is like me now and will only use splenda blend or just splenda; it comes from a natural source. stevia is good but alot sweeter than normal sugar is. years ago my sister had tried for 5 yrs to get pregnant and couldn't even had surgery. she stopped doing any sodas just to see if she'd feel better and she got pregnant. she has two grown kids now and the only time she got pregnant was when she'd stop drinking diet sodas. she never took birth control pills in the past 30+ years.