A chemical compound or active ingredient found in calendula plants, believed to have medicinal or therapeutic properties.
From calendula plus the suffix -in (used for chemical compounds and proteins), similar to how 'protein' comes from Greek protos.
Scientists isolating 'calendulin' were trying to figure out WHY calendula worked so well medicinally—they found it's actually a mix of compounds, not just one magic ingredient, which is why the whole plant is so powerful.
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