Once opened, Monkey Whizz will last for up to 24 months. After opening, Monkey Whizz will remain safe to use for up to 24 months. This is due to the preservatives used in the product and the lack of water, which tend to allow for longer shelf life than products that contain water.
The best way to ensure the product is still safe and efficacious is to check the expiration date on the package. The expiration date should always be within 24 months, or two years, from the time it was opened.