Kroeger Herbs Complete Concentrates Bilberry helps with eyesight, night vision, diabetic retinopathy, macular degeneration and varicose veins. Kroeger Herba Bilberry Complete Concentrate is also a good anti-oxidant. Complete Concentrates Complete Concentrates bridge the gap between traditional and standardized herbs by using an all-natural extract in a base of raw herb. When it comes to Kroeger's Complete Concentrate line, they bring you the best of both worlds by providing herbs that are: Standardized: Meaning they contain consistent, high potency amounts of active constituents, without sacrificing other compounds of the plant. Full Spectrum: All constituents are represented in the same ratios as found in the plant. Free of Harmful Solvents: Kroeger Herbs only uses water or natural, food-grade alcohol; unlike other companies that may use hexane, acetone, or methanol. Free from Artificial Fillers, Flowing Agents, and Excipients: Kroger Herbs only uses the pure, raw herb in their capsules; unlike other companies that may use magnesium stearate, maltodextrin, silicone dioxide, or other agents.