“The ideal amount of celery juice for most adults is a minimum of 16 ounces per day. Not that you have to or necessarily want to start with 16 ounces the first time you try it. Feel free to work your way up, starting with 4 or 8 ounces if you’re sensitive and from there increasing it a little every day as you get used to it.
Once you’re ready, it is a good idea to commit to those 16 ounces as a minimum. Why? Because most people have more than a few health obstacles to overcome. The celery juice must travel quite a distance on its journey. Its first obstacle is often in the mouth, with bacteria or leftover toothpaste, mouthwash, or mouth rinse. (Make sure to thoroughly rinse your mouth with fresh water after brushing your teeth and before drinking celery juice to get rid of any toothpaste, mouthwash, or mouth rinse residue. Even better, wait to brush your teeth until after you’ve had your morning celery juice.)