My 2 current favorite decoctions, although not specifically for respiratory, are red pine needles (locally-sourced from public woodlands where no chemical spraying happens), and raw nigella sativa seeds (my go-to source, Kevala, is currently sold-out - drat). For respiratory, my #1 is inhaling the steam from 1 part food-grade 3% hydrogen peroxide diluted in 5 parts RO or distilled water. Also methylene blue is a potent antioxidant, but it's kinda expensive. Cheers!
My 2 current favorite decoctions, although not specifically for respiratory, are red pine needles (locally-sourced from public woodlands where no chemical spraying happens), and raw nigella sativa seeds (my go-to source, Kevala, is currently sold-out - drat). For respiratory, my #1 is inhaling the steam from 1 part food-grade 3% hydrogen peroxide diluted in 5 parts RO or distilled water. Also methylene blue is a potent antioxidant, but it's kinda expensive. Cheers!