Hordeum Vulgare Extract Good Plant extracts Hydration Hordeum Vulgare Extract description _Hordeum vulgare_ extract is more commonly known as barley extract. It can have antioxidant properties when ingested, but there is no research showing this to be the case when applied topically. Barley and its extracts/derivatives are a source of gluten. When fermented (as it is when used to make beer or when combined with yeast in cosmetics), barley extract has been shown to soothe skin.