, a full 1000mg glucosamine sulphate per tablet, with added quercetin a powerful bioflavonoid, fast acting & unique formula, added apple cider vinegar extractthis is a full strength glucosamine product with the powerful bioflavonoid called quercetin. this exciting phytonutrient is found in tiny amounts in fruit particularly apples & has been the subject of several studies to investigate its ‘active compounds’. interestingly apple cider vinegar contains some quercetin & this may explain why it has been a popular supplement for many years. we've added a potent dose of quercetin to each tablet the equivalent to that found in four apples plus a dried extract of apple cider vinegar equivalent to a dessert spoon full of the fresh liquid.glucosamine is naturally produced in our bodies but the millions of people who take it everyday have found that taking a supplement makes a real difference. it has become one of the world’s top selling supplements because of one simple fact; it works!