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Homeopathic and herbal strategies are great for the prevention of diseases which do not have safe and effective vaccines.
Homeopathic and herbal aren't quite the same thing. A homeopathic preparation is intentionally diluted, often to the point where actually getting any of the molecules of what's been diluted is unlikely.
It's entirely possible for herbal treatments to be effective. Many modern drugs are duplicates or slight modifications of things discovered in the real world. But herbal treatments are only subject to the same rigor food is -- if it doesn't kill you, leach lead, or contain too many bug fragments, they're allowed to put it on the shelf whether it does anything or not.
I once saw a bottle of herbal tablets purporting to improve memory, even referencing a study... Intrigued, I looked it up -- the study was about Ginko's effects on
night-vision in people with attention-deficit disorder. Buyer beware.