| Enzyme | Food, beverage, or bioactive compounds Food sources in italics | Type of study | Dosages used and references |
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SULTs | Caffeine Coffee, cocoa, black tea, and green tea [111] | In vivo | 2, 10, and 50 mg/kg caffeine [107] | Retinoic acid (bioactive form of vitamin A) Meat (especially liver), fish, egg, and dairy products contain retinol; apple, apricot, artichokes, arugula, asparagus, and other plant foods contain provitamin A carotenes [111] | In vivo | 2, 10, and 50 mg/kg/d retinoic acid suspension in corn oil [108] |
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| Animal products | Fish, shellfish, lamb, beef, chicken, pork, duck, goose, turkey, egg, and cheese |
| Legumes | Lentils, peas, and butter beans |
| Grains | Barley, oatmeal |
| Vegetables and fruits | Cabbage, horseradish, Brussel sprouts, leeks, cress, haricot beans, apricots, peaches, spinach, and watercress |
| Nuts and seeds | Brazil nuts, almonds, peanuts, and walnuts |
| Herbs and spices | Mustard, ginger |
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