Methoxsalen USP (Phyto Chemicals) Methoxsalen is a naturally occurring photoactive chemical found in the seeds of the Ammi majus (Umbelliferae) plant and in the roots of Heracleum candicans. It belongs to a group of compounds known as psoralens or furocoumarins. https://www.tumblr.com/herbalcreations/763297989115674625/premium-berberine-extracts-supplier-in-minneapolis?source=share