Maximum Strength.
With Echinacea, Astragalus, Vitamin C, Mushroom Extracts, Oregon Grape Root & Ginger Root. NutriBiotic Defense Plus Grapefruit Seed Extract 250 mg - 90 Vegan Tablets NutriBiotic DefensePlus Tablets are a unique formulation combining grapefruit seed extract, vitamin C, echinacea extract, astragalus, ginger root extract, Oregon grape root, yarrow extract, zinc and the mushroom extracts of reishi, maitake, and shiitake and are used by healthcare professionals worldwide..