Feb 18, 2021 · It contains no dairy, starch, sugar, wheat, gluten, soy, corn, egg, fish, shellfish, salt, tree nuts, or GMOs. 2. TruNature Blueberry Standardized Extract. This supplement is taken with water, two soft gels at a time. It’s also listed to have a 36:1 ratio (36 grams of blueberry to 1 gram of blueberry extract).