IS YOUR HYALURONIC ACID SERUM WORTH ITS PRICE?
The biggest difference between a serum or elixir and a cream or lotion is what the formulation DOESN'T include. Always check the full ingredients list. Serums and elixirs are thinner, containing fewer lubricating and thickening/filler agents such as xanthan gum. Because active ingredients are more expensive than thickeners, serums and elixirs are the costliest product in most skin care lines. They are made up of very small molecules so the skin can absorb them. As you can see, xanthan gum has a very high molecular weight, which is OK in heavier products (lotions & creams) to lock moisture in and form a protective barrier over the skin. However, thickeners have absolutely no business in your high-end, concentrated serums because thickeners can also lock active ingredients out. That's the reason moisturizer lotion or creams are always the final step in a skin care routine. Shop wisely!