When you inject hyaluronic acid just under the skin, it makes your skin feel more hydrated, bouncier, and smoother—and scientists use this as a gold standard to see if taking hyaluronic acid pills...

There isn't strong proof that injectable hyaluronic acid makes your face skin better—most of the studies done so far are small, not fair tests, and might be skewed, so we can't be sure it actually causes the improvement.

Getting hyaluronic acid injections in your face might make your skin look and feel more hydrated, firmer, smoother, and less tired-looking, according to some small studies in adults between 25 and 75.

If you get a hyaluronic acid injection alone, your skin might look better than if you get the same injection mixed with other ingredients—based on studies that looked at 8 groups with just hyaluronic acid and 5 groups with mixtures.

Taking a daily supplement of hyaluronan for 12 weeks can make your skin feel tighter and more bouncy on your forehead, arms, and waist—especially at your waist, where it improved by 38% compared to people who didn’t take it.

Taking a daily supplement of hyaluronan for 12 weeks can make your face more hydrated, with a noticeable 10.9% boost in skin moisture compared to not taking it—this also helps your skin stay protected and lose less water.