What is the Botox Shelf Life?

Hi apeeling one,
In the US we use FDA approved Botox Cosmetic by Allergan which comes in 100 unit vials. The unmixed vials are kept refrigerated and have expiration dates that range up to two years out. Once mixed with solution, the Botox is usually used within a day or two, but has been shown to keep its potency even after two weeks.
Be well.
Dr. P

Apeeling One,
There is no 500 unit vial of Botox Cosmetic in this country. Botox Cosmetic comes in 100 units and 50 units. Your last question was about reconstituting Botox. I am concerned that you are purchasing non-FDA approved Botox over the internet or from some other source and trying to figure out how to use it. This can be very dangerous. Please go to a trained medical professional for your Botox.