Hi, David--I'm curious about herbs like Astragalus, Ashwagandha, Prince seng, Hawthorn, Reishi, etc. If someone takes them for a few weeks or a few months, are there permanent or semi-permanent effects? Is daily use necessary? Are some of the effects long-lasting (eg. Hawthorn's strengthening effects on the heart) and others not (eg. Astragalus protecting against respiratory infection)? I'd love to know more about this--right now I'm just guessing. Thanks!