The bark of Guiacum Officinale (Lignum Vitae) is commonly used in folklore practice in Jamaica as a tea preparation to reduce inflammation and pain in knee joints. This study investigated and validated these claims and confirms no toxic effects within 24 hours at the doses used.

Justicia pectoralis is commonly used in Jamaica as a tea preparation to alleviate the difficulty in breathing in asthmatic individuals. This study investigated its effects on tracheal contraction and allergic wheals in the dermis.

In Jamaica, the slug, (Diplosolenodes occidentalis) is used in folklore practice to alleviate the symptoms of an asthmatic attack. A pure bioactive compound, glyceryl trilinolenate (GT) was isolated from the crude slug extract. Glyceryl trilinolenate is a non-toxic and specific H1 antagonist acting non-competitively to produce relaxation of tracheal smooth muscle. It also reduces cutaneous wheal formation and inflammation. This is the first scientific documentation of the actions of GT.