Extract that can have antioxidant benefit for skin, but its aromatic components can cause sensitivity. However, in most skincare products the amount of rosemary extract is unlikely to be a risk, and rosemary extract is much less of a problem for skin than rosemary oil because the extract usually doesn’t contain much, if any, of rosemary oil’s fragrance components.
References for this information:
Chemical Research in Toxicology, November 2001, issue 4, pages 1546-1551
Journal of Agricultural and Food Chemistry, September 1999, issue 10, pages 3954-3962