Purple Citrus’ Grapefruit Seed Extract is Our Grapefruit Seed Extract formula is professional strength comprised of 60% Grapefruit Seed Extract and 40% vegetable glycerin USP. It is a citrus seed-based anti-microbial liquid that is non- irritating and, although it has been accepted as a natural preservative, it is not a full spectrum preservative alone. Grape Fruit Seed Extract is non-irritating…