Your skin already contains hyaluronic acid naturally, which is part of why the synthetic version used in skincare works so well. It can hold up to 1,000 times its own weight in water, making it one of the most effective hydrators available, and one that suits essentially every skin type. Beyond hydration, it has restorative qualities, soothing irritation, curbing water loss, and adding antioxidant protection against environmental stressors.
Interestingly, hyaluronic acid doesn't just work topically. Taken as an oral supplement, in both low and high molecular weight forms, it's been shown to raise skin's hydration levels, soften the look of wrinkles and rough texture, and reinforce the skin's protective barrier.
Hyaluronic Acid References
Journal of Evidence-Based, Complementary and Alternative Medicine, October 2017, pages 816-823 | Journal of Medicinal Food, October 2016, pages 1,172-1,179 | Nutrition Journal, July 2013, ePublication | Journal of Drugs in Dermatology, 2011, issue 9, pages 990-1000 | Journal of Clinical and Aesthetic Dermatology, March 2009, pages 38-43
Our team reviews ingredient research and uses up-to-date evidence to rate ingredients based on the categories below.
Best
Ingredients with the most rigorous and convincing evidence. These are the standouts backed by consistent findings across independent, peer reviewed clinical research.. When we call an ingredient Best, it has earned that distinction through genuine, reproducible proof that it improves skin.
Good
Reliable, well tolerated ingredients that do their job without complaint. They may not carry the headline benefits of a Best rated active, but they hydrate, stabilize a formula, or support the ingredients around them in ways that make a real difference in how a product performs and feels.
Average
Ingredients that are perfectly safe and serve a clear function, typically as an emollient, thickener, or filler, but do not offer any meaningful skin benefit beyond that basic job. Not a red flag, just not a reason to choose one product over another.
Bad/Worst
Ingredients with documented potential to irritate skin, disrupt the barrier, or trigger sensitization in some users, often synthetic fragrance, drying forms of alcohol, or certain essential oils. Not automatically a dealbreaker for every skin type, but worth knowing about before you commit to a product.
