I feel like I'm talking to a customer service robot.. Dude, I get what you're saying.. but in my original post I mentioned coffee and you didn't specify that it was ok and that the C4 was the issue.
Anyway, more importantly..do you have any evidence that synephrine crosses the blood brain barrier? I'm a biochem major, and that chemical structure has hydroxyl groups on the benzene ring and beta-carbon..which is a no-go for crossing the BBB. I'm not saying it doesn't work...I was just curious on what literature you've read.