When olive leaf is grown in warm climates — classically mediterranean — it has been shown to contain unusually high active oleuropein levels which are then converted to a high concentration of the bioactive Elenolic acid (ELA). Our Olive Leaf supplement is the UK’s only ELA supplement that’s made using a patented natural process. Each capsule provides an effective add pharmaceutical strength ELA strength supplement. Read more about the research supporting the use of Olive Leaf for immune protection.