Salicylic acid is a phenolic acid as found in willow bark.
Links to Plants Containing Salicylic Acid
The listings of research below represents a compilation of scientific articles found on the topic, with a very brief overview description of each article/study. This compilation of research articles does not necessarily imply that there are adequate results to demonstrate safe and/or effective human use of any herb listed.
The herbs willow bark (Salix alba), meadowsweet (Filipendula ulmaria), and chamomile (Matricaria chamomilla), and their polyphenol compounds of apigenin, quercetin and salicylic acid showed anti-inflammatory activity in vitro. From: Drummond, E. M., Harbourne, N., Marete, E., Martyn, D., Jacquier, J. C., O’riordan, D., & Gibney, E. R. (2013). Inhibition of proinflammatory biomarkers in THP1 macrophages by polyphenols derived from chamomile, meadowsweet and willow bark. Phytotherapy Research, 27(4), 588-594.