I've had strange effects with various vitamins. B-12 made me irritable. I tried St John's Wort and was OK with it at first. The quality of the capsules content's changed and the effect wasn't as good. The quality of the product was inconsistent, so I stopped buying, fearing the old snake oil. I think it was a TwinLab subsidiary (can't recall the name) that manufactured herbal remedies exclusively.
I got them thru Swanson, that vitamin mail order company in the Dakotas.
I wonder if anyone else on WP has ever taken the vitamin pack from 7/11 at once and gotten really sleepy and felt strange? I felt so weird I questioned if they were toxic (when taken all at once) and poisoning my system. If I take them again, I won't take them all at once, since there are several in the pack. I will try taking them a few hours apart, only two at a time.