The Asteraceae family is enormous and has hundreds of medicinal species with wildly different properties (Arnica, Echinacea, chamomile…..).
I’d need to know what specific aster you’re referring to.
As to respiratory herbs, have a look at these lessons:
Respiratory System II: Conditions & Interventions
Respiratory System III: The Plants
Don't use herbs or combine herbs with medications or use them during lactation or pregnancy without talking with your healthcare provider.
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This reply was modified 1 year, 3 months ago by Dr. Patrick Jones.