“Sweet Leaf” is just another of the gazillion forms of Stevia ...
for myself and the Mrs., any form of Stevia provokes instant, intense headaches ...
Sorry about your headaches.
As for Sweet Leaf, whatever is in it causes nothing for me. I open a little packet and use half each day, splash in a bit of organic pasture-raised milk.I drink half-caf coffee, large cup with cat on my lap, our morning ritual.