What is it? Hyaluronic acid wasn't always known as just an injectable filler; it was actually discovered 60 years ago in vitreous humor. As it naturally occurs in the human (and animal) body, its job is to lubricate and support our tissues. Also, "Hyaluronic acid is a structural component of skin that creates volume and shape," explains FDA Consumer magazine.

Over time as the body ages, hyaluronic acid is broken down. Poor diet and smoking also contribute to lower levels of hyaluronic acid. In the facial area, this leads to wrinkles and sagging around the eyes, mouth and cheeks and overall loss of elasticity. That's where hyaluronic acid comes in as a skincare ingredient: by helping the skin absorb moisture, it's highly effective in promoting a smooth, younger-looking appearance.

You'll find it in: Because hyaluronic acid is an effective moisturizing agent, helping the skin retain moisture, it's often found in anti-aging creams, specifically used to treat fine lines and wrinkles.

Our product picks: For effective anti-aging results, try the SkinMedica TNS Recovery Complex Best Results Kit. This kit includes

TNS Recovery Complex — which restores skin and reduces fine lines and wrinkles — and Dermal Repair — which contains the highest levels of vitamins C and E, hyaluronic acid and omega-3 fatty acid to promote a healthier complexion. In addition, with the power of three complexes in one, HydroPeptide Intensive Concentrate Anti-Aging Corrective Crème replenishes the skin, boosts collagen production, exfoliates and defends against free radicals. For a supple and smooth complexion, try SkinCeuticals Hydrating B5 Gel.

What to expect: With continued use, products with hyaluronic acid can give you younger-looking skin with fewer fine lines and wrinkles. Because of its powerful hydrating abilities, hyaluronic acid leaves you with a supple complexion.

But if you live in an area with low-humidity, you might want to avoid using products with hyaluronic acid, Real Simple cautions. That's because, "it will sit unabsorbed on the surface of your skin and may actually dehydrate it, drawing out moisture," explains the article.

Who should avoid it: Hyaluronic acid is ideal for all skin types, particularly dry skin. But, as with any skincare product, first try a patch test. Should you experience redness or irritation, stop using the product.

See also:

Non-Surgical Rejuvenation: Dr. Novick on Non-Surgical Lip Enhancement (Part 4)

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