I'm sensitive to Y but not to Rauwolscine. The issue I've ran into some times is because Rauwolscine/Alpha-Y is so expensive, some brands use regular Y in its place. I can always tell bc even the smallest amount of regular Y make me feel like crap.Re1gn was bad times for me, with the Y side effects.
I do remember with Re1gn, they had that one batch that something happened with that they had too much of something, it may have been Yohimbine, I can't remember. I never tried that batch. I tried later batches and it was good but the crash sucked.
Pump Addict Ultra Hardcore for me was the good from it without the bad. Great energy, good pumps, and no crash. To me, it feels like functional energy vs cracked out I can't think straight energy.