YOU would restrict "an herb gifted by God"?? You would regulate God's gift? A simple herb?
Sick children, God's children, could not benefit from God's gift?
Blasphemy! You heartless person, you.
You would regulate God's gift?
Yes, for noncontamination, as is rightly done for many of God's gifts. Respecting God's gifts doesn't imply permitting their fraudulent sale (which is what the sale of contaminated goods is).