A key component in green tea extract is EGCG, a source of antioxidants and is associated with weight management. But EGCG taken orally is not absorbed well by the body through the intestine.
Since EGCG is water soluble, it has difficulty crossing the membranes of intestinal cells. So, unabsorbed, EGCG in green tea is eliminated from the body, not allowing any health benefits to be realized.
Phytosome technology produces a small, natural complex that binds EGCG together and is designed to cross intestinal membranes.