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Oral hyaluronic acid

The joint’s own lubricating molecule, taken by mouth — modest evidence for knee osteoarthritis.

Reviewed by Bodil Isaksson, Licensed Biomedical Scientist (Sweden)Last reviewed July 2026Supplement guide

SupplementsJoint healthOsteoarthritis

Hyaluronic acid (HA) is a large sugar molecule that gives synovial fluid its viscosity and helps cushion cartilage. It is well known as a knee injection; taken orally as a supplement, small trials suggest it can ease knee-OA pain — best paired with exercise.

Key takeaways

  • HA is a natural glycosaminoglycan found in synovial fluid, cartilage and skin.
  • Small randomised trials (mostly 80–200 mg/day) report less knee-OA pain and better function, often strongest alongside quadriceps exercise.1
  • Evidence is modest, trials are small, and how much intact HA is absorbed is still debated.1
  • Very well tolerated — a low-risk add-on rather than a proven therapy.

What it is

HA is a high-molecular-weight glycosaminoglycan. Oral HA is thought to be broken into smaller fragments and oligosaccharides in the gut, which may signal to joint tissue and gut immune cells rather than being deposited whole into the joint — the mechanism is still being worked out.

The evidence

A 2016 Nutrition Journal review pooled randomised, placebo-controlled trials from 2008–2015: oral HA at roughly 80–200 mg/day improved knee pain, WOMAC scores and quality of life versus placebo, with the clearest benefit when combined with quadriceps-strengthening exercise.1 The trials are small and several are manufacturer-linked, so treat it as a reasonable low-risk option rather than an established one.

Dose & how to use

Commonly 80–200 mg/day of an oral HA supplement; pair it with strengthening exercise for the joint. Allow about 8–12 weeks.

Safety & who benefits

Excellent tolerability — adverse effects in trials are rare and mild. Most relevant for knee osteoarthritis, particularly for people already doing rehabilitation exercise who want a gentle add-on.

Bottom line: a very safe, modestly evidenced add-on — 80–200 mg/day of oral HA, ideally with quadriceps exercise, for knee-OA comfort.

References

Adult research summary for education, not a prescription. These are food supplements, not treatments for disease.

  1. Oe M, Tashiro T, Yoshida H, et al. Oral hyaluronan relieves knee pain: a review. Nutr J 2016;15:11. pmc.ncbi.nlm.nih.gov

This article summarises nutrition science for education. It is not a substitute for individual medical advice; consult a professional before starting a supplement, in pregnancy, or alongside medication.