Cranberry juice mixtures with 20% may contain color, flavors, and citric acid. The finished cranberry juice from concentrate product should yield a minimum of one part cranberry juice concentrate to three parts water with a minimum Brix level of 12°. Additionally, each cranberry juice product should be fortified with Vitamin C (Ascorbic Acid), with each serving size delivering not less than 100% of the current US Referenced Daily Intake. The minimum titratable acidity of the cranberry juice product must be 1.67% wt/wt, measured as citric acid. Canada For Canadian markets, cranberry juice is regulated as a processed product under fruit juices. Cranberry juice must be made from sound, clean, and ripe cranberries. One or more of the following dry sweetening ingredients may be added: sugar, invert sugar, and dextrose. According to the Canadian Food Inspection Agency (CFIA), the common name of this product may appear as "cranberry juice drink/cooler" if at least 25% of the named juice is contained within the net quantity of the product. In Canada, cranberries are graded into two categories: Canada No. 1 and Canada Domestic. The cranberries of Canada No. 1 grade are required to be fairly clean; be uniform in size; and free from any damage and/or defect that affects the appearance, edibility, or shipment quality. The cranberries of Canada Domestic grade are required to be reasonably clean; and be free from any damage and/or defect that seriously affects the appearance, edibility, or shipment quality. Furthermore, all grades must be properly packaged; be sound; have a minimum surface area of 65% coloured red; and be free of insects and insect larvae. Interaction with blood thinners Cranberry juice may interfere with coumarins used as blood thinners, such as warfarin, causing an unstable INR. The British National Formulary (BNF) and the Food and Drug Administration (FDA) both advise avoiding concomitant use. Market Commercially cultivated in the United States and Canada, cranberries are harvested in the autumn for manufacturing of juice and other products. A barrel of US cranberries weighing cost US$57.60 in 2017, but the price fell to $22.30 per barrel in 2019 due to international trade wars with the United States, causing the market to shift to more purchases from Canada. Including cranberries used for juice production, Americans consume some 400 million pounds (180 million kg) of cranberries per year. About 95% of the annual US cranberry harvest is used to make juice or juice