both questions

Vitamins
Neither vitamins B nor C have any effect (to my knowledge) on Calea Z. since it's not a precursor to seratonin or melatonin, and therefore doesn't require said vitamins to bond with anything or to inhibit uptake.


What to use:
The buds and leaves are most potent, but the stems are pretty decent too.

My signature doesn't work anymore. LOL.