Sodium hyaluronate · supplement
Evidence tier: moderate
A natural moisture binding molecule. Oral HA reaches skin and joints, useful for dry skin and joint comfort.
Not proven in humans, and the honest answer contradicts the usual story. Ingested hyaluronan cannot be degraded by gastric and intestinal enzymes but IS degraded by gut microbiota (Bacteroides species are required), which cleave it into oligosaccharides under 3 kDa that are only partially absorbed, with the remainder fermented to short chain fatty acids. The plausible route is therefore indirect and systemic, oligosaccharide or SCFA signalling that stimulates the body's own fibroblasts to make hyaluronan, rather than the ingested polymer arriving intact at the skin.
Moderate, and the honest version is smaller than the marketing. Oral hyaluronic acid does have human RCT evidence for skin hydration, but it is thin, short and dominated by one manufacturer. The Frontiers in Nutrition 2022 systematic review and meta analysis (PMID 35719159) pooled only 4 trials and 196 people for hyaluronan and skin hydration and found a SMALL effect (SMD 0.40, 95 percent CI 0.11 to 0.68, p = 0.007). A 2025 meta analysis in J Drugs Dermatol (PMID 40911749) pooled 7 RCTs and found significant improvements in hydration, elasticity and wrinkle depth, but firmness, wrinkle volume and transepidermal water loss were NOT significant, and the authors concede the limited sample size and heterogeneity call for larger, more robust trials. The joint evidence is weaker still: the reviews (PMID 39886281, 11 studies, 597 patients; Oe 2016, PMID 26818459, 13 trials) apply no formal risk of bias tool and conclude only that oral HA SEEMS to play a safe and efficacious role. There is no Cochrane review of ORAL hyaluronic acid. Cochrane's hyaluronic acid work is on intra articular injection, which is a different intervention delivered by a clinician into a joint, and none of that evidence transfers to a capsule. The industry funding problem here is severe rather than incidental: the most cited wrinkle RCT (PMID 34203487) was funded by Kewpie Corporation and three of its authors are Kewpie employees, and the Oe 2016 knee pain review has four authors from Kewpie's R and D division, the maker of the branded HA studied, while declaring no competing interests. That is a material disclosure failure and the review should not be treated as independent.
120 mg daily is the most tested skin dose. Skin trials run 100 to 200 mg daily; joint trials 30 to 300 mg daily (Oe reports 48 to 240 mg daily), over durations of 2 weeks to 12 months. Molecular weight varies widely across trials (2 kDa to about 300 kDa) and is a determinant of the very limited absorption.
120 to 240 mg daily.
Onset: ~56 days
Very safe.
Pregnancy: caution
Breastfeeding: caution
Active compounds: hyaluronan polymer, sodium hyaluronate, low molecular weight hyaluronan oligosaccharides
Remedies using Hyaluronic Acid · Browse by body system · Check it against what you take
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.