Food-Info.net has E-numbers for acetic acid side effects.

Natural acid is present in most fruits.It is present in all fermented products.Commercially produced by chemical synthesis from acetealdehyde.

The function and characteristics of acetic acid are listed below.It is added to increase the effectiveness of the vaccine.The highest activity is at a low pH.It can be used as a buffer in acidic foods.It's also used as an aroma component.