Eyewise provides a full 20mg of lutein (pure free-form) per tablet making this product one of the strongest available. It also provides bilberry, grapeseed, and blackberry extracts. Each tablet provides a full 20mg of pure, free-form lutein, making it one of the strongest options on the market. Eyewise also includes zinc and riboflavin, essential minerals and vitamins that contribute to maintaining normal vision and protecting cells from oxidative stress. Lutein, a yellow carotenoid, is not produced by the body and must be obtained through diet. In nature, lutein is naturally produced by plants to protect their cells from sunlight. Similarly, our bodies use lutein to filter out harmful wavelengths of sunlight that can damage the delicate light receptor cells in the macula.