<span style=”font-family: Arial, sans-serif;”>Do you know of a place I can learn about plants that have tannin versus alkaloids as applies to herbalism? Which plants are tannic and which are alkaloid?</span>
For more details, you might want to consider getting Herbal Constituents by Lisa Ganora. It is a little heavy on organic chemistry, but definitely a worthy read.
Seems like James Green in his Herbal Medicine Maker’s Handbook said something about glycerin making tannins and alkaloids play nice together in tinctures.
Don't use herbs or combine herbs with medications or use them during lactation or pregnancy without talking with your healthcare provider.