The shelf life of the unopened product is three years. Once the product is activated by pressing the button and mixing the 100% Pure Vitamin C powder with the serum, we recommend that the product be used within 30 days to ensure full product efficacy.
NOTE: As the activated Daily Serum nears the 30-day point, customers may see a yellow tint develop in the formula. This is a helpful visual indication that the product is nearing the end of its peak potency. While the product remains safe and effective to use for a full 30 days, after 30 days we recommend activating a new bottle.