Product Shelf Life and Stability

Regarding the shelf life and stability of the two products:

1. Vitamin C E Ferulic: The product description indicates that it uses Vitamin E and Ferulic Acid to help stabilize the Ascorbic Acid. However, the description does not specify the exact shelf life before opening or the typical period of stability after opening before oxidation occurs. Proper storage in a cool, dark place is generally recommended for Vitamin C serums to maximize their lifespan.

2. Stabilized Vitamin C (Natural-C Glycol™) Serum: The description for this serum provides more specific storage information. It states that for long-term storage, it should be kept in the refrigerator at 6-8°C, away from light, and can last for at least 2 years. It can also be stored at room temperature but must avoid light and be in opaque packaging. The description does not give a specific number of days it will last after opening. The stability after opening will depend on storage conditions (avoiding light and air exposure) and how frequently it is opened. Observing changes in color (darkening) or clarity can indicate oxidation.

In summary, for the Stabilized Vitamin C serum, refrigeration is recommended for maximum shelf life (at least 2 years unopened). For both products, minimizing exposure to light and air after opening and storing in a cool place will help maintain their stability for as long as possible, although a specific post-opening duration is not provided in the descriptions.