Grapefruit juice is the fruit juice from grapefruits. It is rich in Vitamin C and ranges from sweet-tart to very sour. Variations include white grapefruit, pink grapefruit and ruby red grapefruit juice. == Drug interactions == Grapefruit juice, and grapefruit in general, is a potent inhibitor of the cytochrome P450 CYP3A4 enzyme, which can affect ... Found on http://en.wikipedia.org/wiki/Grapefruit_juice
(from the article `nutritional disease`) ...disease. Tyramine, an amino-acid derivative found in certain aged cheeses and red wines, may cause hypertension in individuals being treated for ... Found on http://www.britannica.com/eb/a-z/g/60