The recommended amount of celery juice to drink per day is around 16 ounces, ideally on an empty stomach. This amount should be sufficient to provide celery juice's beneficial antioxidants without overloading the body with excessive amounts of nutrients. It is also important to note that the recommended amount may vary depending on individual factors such as health status and tolerance. Those with certain health conditions or taking medications should consult with a healthcare professional before incorporating celery juice into their diet. In conclusion, moderation is key when it comes to drinking celery juice or embarking in any juice cleanses, and individuals should aim to consume no more than 16 ounces per day to reap the benefits without any potential negative effects.