Hyaluronic acid
The body's own water-holding molecule, taken mostly for skin and joints.
- Skin and fine lines
- Joints and aches
- Dry, gritty eyes
A plain-English overview, not advice. Written from published reviews and trials and from what people say in public forums.
Compare hyaluronic acid prices per dose
On this page
What is hyaluronic acid?
Hyaluronic acid is a long, chain-like sugar molecule — a glycosaminoglycan — that the body makes for itself and keeps in the extracellular matrix, the scaffolding between cells in skin, joints and other soft connective tissue. It holds water strongly, and reviews describe the amount held in those tissues falling gradually with age. Supplement makers extract it with chemicals or enzymes, or grow it by fermentation, and sell it as capsules, tablets, powders and liquids. Most people meet it first in skincare or as an injected filler; the pot on the shelf is the same molecule, swallowed instead.
Why do people take hyaluronic acid?
Skin and fine lines
The thinking. Skin is what most people buy hyaluronic acid for. The body keeps a great deal of it in the skin, where it holds water and props up the mesh of proteins around the cells, and reviews describe that store thinning with age. The idea behind a capsule is to top up from the inside what is slowly being lost.
What research has found. Trials measured hydration, elasticity and wrinkle depth with instruments rather than by eye, at 30 to 200 milligrams a day over four weeks to four months, and pooled together the averages came out in its favour. One trial that added it to a collagen and vitamin C supplement found nothing beyond what the collagen was doing on its own. A fair body of trials has looked at this, and most point the same way.
Joints and aches
The thinking. Achy knees are the other reason people reach for it. Hyaluronic acid is part of synovial fluid, the thick liquid inside a joint, which reviews describe it making slippery and cushioning — the same reasoning that lies behind injecting it straight into a knee. A capsule is an attempt to reach the same place by swallowing.
What research has found. Two trials have measured it taken by mouth. In adults with knee osteoarthritis on 200 milligrams a day for a year, alongside a daily strengthening exercise both groups did, symptom scores improved on both sides; the difference showed up only in those aged seventy or under, and only in the early months. A four-week trial in people with long-standing pain found scores falling in both groups, more clearly within the group taking it than between the two. Studies here point in different directions, so this one is still being worked out; the dose, how long people took it and who took part all seem to matter.
Dry eyes
The thinking. Dry eyes are the third thing people buy hyaluronic acid for. Reviews of supplements list dry eyes among the age-related complaints people take it for, alongside dry skin and aching joints, and the reasoning is the same water-holding one. Hyaluronic acid is already used in the eye, where reviews describe it moistening the surface and making up for a thin tear film; what is usually sold as drops is being swallowed instead, in the hope it arrives in the same place.
What research has found. No trial in people has measured this, so there is nothing to report either way yet.
What does hyaluronic acid do in the body?
Hyaluronic acid is not something the body must be given: it makes its own, and breaks it down again as it goes. It sits in the extracellular matrix, the mesh between cells, where it holds water, gives other proteins something to hang on and acts as the handle certain receptors grip. Reviews describe the amount in tissues falling gradually with age.
Whether a molecule this big survives being swallowed and reaches those tissues is the open question, and one review is given over to how it is absorbed and broken down after being taken by mouth. Size is part of the story: one trial used a single very large molecule, another a supplement spanning a wide range of sizes, and reviews note that small fragments behave differently from big ones, stirring inflammatory signalling the large ones do not. Hyaluronic acid talks to cells through receptors called CD44 and RHAMM, which shape how cells move and how inflammation settles.
What do people say about taking hyaluronic acid?
These are anecdotes people have shared, not evidence.
What people like
- Three of these five threads come from one dry-eye community, so what people there hope for leans towards eyes rather than skin.
- Confident reports are rare: across the five threads only two people describe a change they are sure came from taking it.
- One person taking capsules for skin describes it as plumping, and says the difference is obvious within days of stopping.
- One taking sachets for a shoulder problem reports easier movement and less pain, while crediting physiotherapy for part of that.
Common complaints
- The commonest note is not being able to tell whether it is doing anything, and carrying on anyway in case stopping is worse.
- Doctors come up twice, one telling a poster not to bother with the capsules and an eye consultant calling supplements a waste of time.
- Cost is raised more than once: about a pound a day for sachets, and capsule packs that need three capsules daily.
- Scepticism runs through the threads, with one poster arguing it is absorbed neither through the skin nor by mouth.
How people take it
- Capsules and tablets are the usual form, with powder sachets stirred into water described too; daily amounts named run from 120 to 300 milligrams.
- Once a day is the pattern, though one capsule product was described as needing three capsules to make up the daily amount.
- People buy three-month supplies and talk about judging it after a month or more, rather than expecting a quick change.
- It sits alongside other things, eye drops and omega-3 in the eye threads and other supplements in the skin ones, so effects blur.
Read from these public discussions:
- Hyaluronic acid products (MoneySavingExpert, 2011)
- Supplements for skin (Mumsnet, 2016)
- Oral hyaluronic acid supplementation for dry eye (Dry Eye Zone, 2019)
- Hyaluronic acid - capsules (Dry Eye Zone, 2006)
- Oral hyaluronic acid? (Dry Eye Zone, 2017)
What forms of hyaluronic acid are there?
| Form | What’s different | Per serving, on products we list |
|---|---|---|
| Hyaluronic acid | One ingredient under three names: hyaluronic acid, hyaluronan and sodium hyaluronate. | 150 mg to 400 mg |
What else is worth knowing about hyaluronic acid?
- Labels give the amount per serving, and a serving may be more than one capsule. The skin trials used 30 to 200 milligrams a day; the knee trial used 200 milligrams a day for a year.
- Most hyaluronic acid research is not about swallowing it. It is injected into a knee, injected into the face as a filler, or dropped into an eye — all different products from the capsule, powder or drink.
- Three of the four skin trials studied women only, one of them aged forty to sixty-five, and the fourth healthy adults. The knee trial was in adults with knee osteoarthritis, and the difference it found was in those aged seventy or under.
- The skin trials measured their first changes between two and eight weeks, with skin thickness shifting only by twelve; the knee trial ran for a year.
If you take medication, are pregnant, or have a health condition, check with a pharmacist or GP first.
The research behind this page (13 studies)
- Oral Hyaluronic Acid Supplement: Efficacy in Skin Hydration, Elasticity, and Wrinkle Depth Reduction. (2025, meta-analysis)
- Oral sodium hyaluronate improves skin hydration, barrier function and signs of aging: a randomized, double-blind, placebo-controlled trial in 150 healthy adults. (2025, randomised trial)
- The Effects of Dietary Supplementation with Collagen and Vitamin C and Their Combination with Hyaluronic Acid on Skin Density, Texture and Other Parameters: A Randomised, Double-Blind, Placebo-Controlled Trial. (2024, randomised trial)
- Oral administration of hyaluronic acid to improve skin conditions via a randomized double-blind clinical test. (2023, randomised trial)
- Oral intake of a new full-spectrum hyaluronan improves skin profilometry and ageing: a randomized, double-blind, placebo-controlled clinical trial. (2021, randomised trial)
- Oral intake of a liquid high-molecular-weight hyaluronan associated with relief of chronic pain and reduced use of pain medication: results of a randomized, placebo-controlled double-blind pilot study. (2015, randomised trial)
- Oral administration of polymer hyaluronic acid alleviates symptoms of knee osteoarthritis: a double-blind, placebo-controlled study over a 12-month period. (2012, randomised trial)
- Recent advances in hyaluronic acid based therapy for osteoarthritis. (2018, review)
- Absorption, metabolism, and functions of hyaluronic acid and its therapeutic prospects in combination with microorganisms: A review. (2023, review)
- The bioengineering application of hyaluronic acid in tissue regeneration and repair. (2024, review)
- The most promising microneedle device: present and future of hyaluronic acid microneedle patch. (2022, review)
- Hyaluronic Acid-Extraction Methods, Sources and Applications. (2023, review)
- Hyaluronan: A key player or just a bystander in skin photoaging? (2022, review)
How much does hyaluronic acid cost?
That depends on the form and the pack, so we work out the price of the same dose of every hyaluronic acid product we can find and rank them.