So much fits in this tiny fridge :) Vitamin c, in my opinion, is the most important thing to refrigerate because a lot of them have a short shelf life and can oxidize quickly, which then makes them ineffective. I love keeping my hydrating mists chilled for that extra refreshing hydration. Essences, which are different in toners, are amazing at hydrating and replenishing the skin. As long as they don’t have any oil based ingredients, it’s safe to keep them chilled which keeps them effective longer. Tools and sheet masks just feel better cold plus it helps depuff :)