Stay away from this drink if you have a weakened immune system or a long-term health condition -- especially liver, kidney, or lung disease. Don’t drink it if you’re pregnant. It’s not for young children either. But if you’re a healthy adult, the store-bought kind that’s pasteurized is fine in moderation -- but not more than 12 ounces per day. Read the nutrition label, though, because the sugar and calories can vary quite a bit by brand.