Caudalie's founders own a vineyard in France from which they source all of their patented grape-derived antioxidants: resveratrol, polyphenols, and viniferine.  Because they grow their own ingredients, they are able to include much higher concentrations in their products compared to other brands for the same price point, since other brands are buying these ingredients through distributors who add cost to the ingredients.  Caudalie has also developed lipid-soluble delivery systems for the active ingredients so that these antioxidant-rich products aren't alcohol-based like most on the market - this makes them not only more gentle but also more deeply absorbing and effective.