ExpectorantHerbal Actions / By Karen Coe Expectorant herbs increase mucosa secretion thereby facilitating coughing up the secrete residual. Expectorant Herbs Holy Basil – Ocimum sanctum L. orOcimum tenuiflorumSt. John’s-Wort – Hypericum perforatum Share this:TwitterFacebookPinterestLinkedInPrint Like this:Like Loading...