Grapefruit bioflavonoids (polyphenols) are converted into an extremely potent compound Contains vegetable glycerine (67-Percent ) and grapefruit seed extract(33-Percent ), a compound derived from the seed and pulp of grapefruit Made without Gluten and GMOs Vitamin A added (only in Canadian GSE) Nutribiotic GSE Grapefruit Seed Extract is ideal for people in need of an immune boost. RECOMMENDED USE Adults, mix 5-15 drops into a glass of water or juice and drink, 1 time daily, with food. Mix drops om a glass of water or juice. Take a few hours before or after taking other medications. INGREDIENTS Vitamin A, Glycerin, Citrus Grandis (Grapefruit) Seed Extract.