Gluconic acid is a type of acid that is made from a sugar called glucose. It is found naturally in many fruits and honey. It is often used as a food additive to add acidity and act as a preservative. Full definition
The higher the value of gluconic acid compared to acetic acid the smoother the taste (less sharpness). (happyherbalist.com)
While vinegar contain aectic acid Kombucha contains acetic as well as other acids such as gluconic acid which are all produced in the fermentation process. (nutritionfacts.org)
Like the damage, cancer warnings, what the EPA says about Gluconic Acid. (mommypotamus.com)