Taking hyaluronic acid by mouth might help keep your skin more hydrated, especially if you're Chinese or have mixed heritage, but the studies so far aren't very reliable.

People who swallow hyaluronic acid supplements—whether they’re big or small molecules—tend to have moister skin, which suggests the size of the molecule doesn’t matter for this effect.

Taking hyaluronan pills every day for about a month or two may help make dry skin on your face and arms more moisturized, according to studies done on Japanese adults.

Taking hyaluronan by mouth might help your skin make more of its own hyaluronan and boost skin cell growth, according to lab and animal studies.

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.

Taking a daily supplement of 120 mg of hyaluronan for 3 months can make your face skin feel smoother and less rough, especially if you're a healthy Asian adult between 35 and 64 years old.