Some creams come with a thin plastic lid under the cover. Should I keep it or toss it?

Gideon Lupine Ask Dr. Moss Leave a Comment

Question

Some creams come with a thin plastic lid under the cover. Should I keep it or toss it?

Answer

Keep it.

Exposure to light and air breaks down many active ingredients, including vitamin C and retinol, making them inert. Also, store these products in a cool, dark place to help maintain their efficacy.