Hyaluronic Acid Pills for Skin and Joints: Small Trials, Key Ones Run by the Ingredient's Maker
Oral hyaluronic acid shows a modest skin-moisture signal and a weaker joint signal. Most trials are small, and the best-known ones were run with the ingredient's maker.
By Kymata Health Editorial Published Last checked
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Key takeaways
From 6 sources- Across 7 randomized trials, oral hyaluronic acid improved skin hydration, elasticity and wrinkle depth, but not firmness or water loss through the skin2.
- The most-cited skin trial had 40 people, was funded by Kewpie Corporation and tested Kewpie's own hyaluronan ingredient1.
- A 2025 analysis of 40 trials on sun-related skin ageing found no significant benefit from hyaluronic acid4.
- In a 12-month knee osteoarthritis trial, both groups improved; capsules beat placebo only in people aged 70 or younger, at months 2 and 45.
- Side effects across 11 oral joint studies were rare and mild6.
What this article covers
1 evidence profileThe evidence, graded
Pulled from the trial tables in our evidence profiles. Grades follow our evidence-grading policy.
Graded findings
3 rows- CGrade CWrinkles, skin moisture and elasticityImproved Wrinkle scores, skin water content, water loss through the skin and elasticity all improved vs placebo by week 12, with gains already at week 8.Hyaluronic Acid · RCT · n=40 · 2021 · PMID 34203487
- DGrade DKnee osteoarthritis symptomsMixed Symptoms improved in both groups. The hyaluronan group did better only in the subgroup aged 70 or younger, and only at months 2 and 4.Hyaluronic Acid · RCT · n=60 · 2012 · PMID 23226979
- DGrade DOsteoarthritis and low back pain symptomsImproved Nine of 11 studies reported better pain, WOMAC, function or stiffness scores; adverse effects were rare and mild.Hyaluronic Acid · Systematic review · n=597 · 2024 · PMID 39886281
Where these trials agree: Hyaluronic Acid and skin, counted row by row in the Consensus finder.
Why swallow something your body already makes?
Hyaluronic acid, also called hyaluronan, is a water-holding molecule found in connective tissue, including skin and joint fluid1. Creams and injections put it where it is wanted. Pills depend on the gut, which is why the trial results matter more than the mechanism.
Skin: a moisture signal built on small trials
A 2021 trial in Taiwan randomized 40 adults aged 35 to 64 to 120 mg/day of hyaluronan or placebo for 12 weeks1. Wrinkle scores, skin water content, water loss through the skin and elasticity all improved more than with placebo, and the wrinkle, moisture and elasticity gains were already visible at week 81.
A 2025 meta-analysis pooled 7 randomized trials and found significant gains in hydration, elasticity and wrinkle depth, while firmness, wrinkle volume and water loss through the skin only trended better2. The authors flagged the small total sample and differences between trials2.
A 2022 meta-analysis of skin-moisturizing supplements also found a significant hydration effect for hyaluronan, but too few trials to judge water loss through the skin3. Collagen and ceramides showed a hydration effect in the same analysis3.
Not every analysis agrees. A 2025 meta-analysis of 40 trials on sun-related skin ageing found hyaluronic acid did not significantly improve photoaging measures or skin elasticity, while collagen and some polyphenols did4.
Who paid for the trials
The 40-person skin trial was funded by Kewpie Corporation, tested Kewpie's own hyaluronan ingredient, and three of its seven authors were Kewpie employees1. The 12-month knee trial also tested Kewpie's hyaluronan ingredient, and four of its six authors were from Kewpie's research and development division5.
One author of the 2022 moisturizing meta-analysis was employed by a pharmaceutical company3. Company funding does not make a result wrong, but small sponsor-run trials need independent replication before the effect can be relied on.
Joints: weaker than the skin evidence
In a 12-month Japanese trial, 60 adults aged 50 or older with mild-to-moderate knee osteoarthritis (Kellgren-Lawrence grade 2 or 3) took 200 mg/day of hyaluronan or placebo, and everyone did daily thigh-strengthening exercise5. Symptoms improved in both groups; the hyaluronan group did better only among people aged 70 or younger, and only at months 2 and 45.
A 2024 systematic review counted 11 oral studies with 597 patients, at 30 to 300 mg/day for 4 weeks to 12 months, and 9 reported better pain, function or stiffness scores6. It searched a single database and tallied positive studies rather than pooling results, so it cannot say how large the effect is6.
Oral hyaluronic acid has not been shown to replace exercise or other knee osteoarthritis care. For comparison, see what trials show for glucosamine and chondroitin and turmeric.
Safety and who should be careful
Adverse effects in oral studies were rare and mild6. None of the studies in our sources reported drug interactions, but interaction data for oral hyaluronic acid are thin.
Groups the trials do not cover well:
- Pregnant or breastfeeding women: the studies covered here report no safety data for these groups.
- People with knee osteoarthritis: in the 12-month trial, capsules were added to daily exercise, not used instead of it5.
- Anyone on prescription medicines or with a chronic condition: ask a pharmacist or clinician before adding a supplement.
Bottom line
Oral hyaluronic acid has a plausible, modest effect on skin moisture in small trials2, and the best-known trial was funded by the ingredient's maker1. The joint evidence is weaker and rests mostly on symptom scores from small studies56. For the more heavily studied skin supplement, see does collagen really work for skin.
Quick answers
Common questions
4 answersHow much hyaluronic acid was used in skin trials?
How long before hyaluronic acid pills affect skin?
In the 12-week skin trial, wrinkle, moisture and elasticity differences versus placebo appeared by week 81.
Does hyaluronic acid help sun-damaged skin?
A 2025 meta-analysis of photoaging trials found no significant benefit for hyaluronic acid4.
Is hyaluronic acid safe to take daily?
In 11 oral studies lasting up to 12 months, side effects were rare and mild6. The studies covered here report no safety data for pregnancy or breastfeeding.
Keep reading
Full evidence profiles
Every graded study, studied doses, interactions and safetyRelated articles
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2 capsules: 300 mg high-molecular-weight sodium hyaluronate, the top of the 30–300 mg/day studied (the skin trial used 120 mg/day); 30 servings
$22.00one-time$18.70subscribeChecked Oct 11, 2026 - HerbsProNOW Foods Hyaluronic Acid, 100 mg, 60 Vcaps
1 veg capsule: 100 mg hyaluronic acid (from sodium hyaluronate) with 100 mg L-proline, 50 mg alpha-lipoic acid and 25 mg grape seed extract
$16.74one-timeChecked Oct 14, 2026 - Renue by ScienceRenue by Science LIPO HLA hyaluronic acid, liposomal capsules (90)Subscribe & Save 10%
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1 capsule: 150 mg hyaluronic acid (liposomal)
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References
6 sources. Numbers in the text link here.
Sources cited in this article
6 sources- 1Oral Hyaluronan Relieves Wrinkles and Improves Dry Skin: A 12-Week Double-Blinded, Placebo-Controlled StudyNutrients, 2021 · PMID 34203487
- 2Oral Hyaluronic Acid Supplement: Efficacy in Skin Hydration, Elasticity, and Wrinkle Depth ReductionJ Drugs Dermatol, 2025 · PMID 40911749
- 3Effectiveness of Dietary Supplement for Skin Moisturizing in Healthy Adults: A Systematic Review and Meta-Analysis of Randomized Controlled TrialsFront Nutr, 2022 · PMID 35719159
- 4Effectiveness of dietary supplements for skin photoaging in healthy adults: a systematic review and meta-analysis of randomized controlled trialsFront Med (Lausanne), 2025 · PMID 40761858
- 5Oral administration of polymer hyaluronic acid alleviates symptoms of knee osteoarthritis: a double-blind, placebo-controlled study over a 12-month periodScientificWorldJournal, 2012 · PMID 23226979
- 6Oral Hyaluronic Acid in Osteoarthritis and Low Back Pain: A Systematic ReviewMediterr J Rheumatol, 2024 · PMID 39886281
Hyaluronic Acid and other dietary supplements are not intended to diagnose, treat, cure or prevent any disease, and these statements have not been evaluated by the FDA. Talk to your clinician or pharmacist before starting a supplement, especially if you take prescription medicines. Product links on this page are paid partner links.