Remember that we are discussing a NEBULIZER which limits the amount you are taking by definition.
You can indeed overdose by drinking it. If you drink too much, as in 16 ozs a day for years, then your skin can turn blue, called Argyria.
You can also affect your good bacteria located in the large intestine by drinking too much at one time. If you are suffering a BAD case of food poisoning, then you may need to drink several ounces 3 times a day and in this case always take probiotics to restore your gut flora when you have recovered.