Bilberry Extract, in powdered extract form, by BulkSupplements.com is one of the selections from our fruit extracts. This Bilberry Extract powder is sourced from Bilberry fruit, Vaccinium myrtillus. Each serving of this product contains 500mg of Bilberry fruit extract with 4:1 extract ratio which is about 1/5 tsp and may need an accurate milligram scale to measure. And, we also sell it different sizes ranging from 100g to 25kg in resealable bags. Contents of this product is sold by weight, not volume and settling may occur. Our Bilberry Extract powder, or Bilberry powder, is pure, natural and does not contain any fillers, additives, and artificial flavors. And this Bilberry supplements for eyes is dairy free, gluten free, soy free, and no added sugar. All products by BulkSupplements.com are manufactured according to cGMP Standards to ensure the highest quality for manufacturing, packaging, labeling, and holding operations. We work with a third-party laboratory that test our products at multiple stages during production, from raw material to finished products, and ensures compliance, standards, and consistency.