Oral Hyaluronic Acid: Does Taking It Work, or Only in a Cream?
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Quick answer: yes, there is evidence, although it is still limited. A meta-analysis of 7 randomised controlled trials published in 2025 found statistically significant improvements in skin hydration, elasticity and wrinkle depth with oral hyaluronic acid. The most studied dose is around 120 mg a day, with results measured after several weeks. Taking it orally does not replace your topical products: they work in different ways.
What hyaluronic acid is and why skin needs it
Hyaluronic acid is a molecule your body makes naturally. It is found in connective tissue, joints and eyes, and a large part of the body's total is in the skin. Its main property is that it binds and holds water, which helps keep the skin plump and flexible. Like collagen, the amount in the skin tends to decrease with age.
Can it be absorbed if you swallow it?
This is the obvious objection: hyaluronic acid is a very large molecule, and large molecules are not absorbed intact. Research suggests that ingested hyaluronic acid is broken down in the gut, partly by intestinal bacteria, into smaller fragments. Studies in animals with labelled hyaluronic acid detected it reaching the skin, and it is believed that these fragments can also act as signals for the body's own production. The mechanism in humans is not fully understood.
What the clinical trials show
A review published in Nutrition Journal in 2014 brought together trials in people with dry skin and concluded that ingesting hyaluronic acid improved skin moisture. Most of those studies used 120 mg a day.
The most complete analysis to date is a meta-analysis published in 2025 in the Journal of Drugs in Dermatology, which pooled 7 randomised controlled trials. It found statistically significant improvements in hydration, elasticity and wrinkle depth. Effects on firmness, wrinkle volume and transepidermal water loss showed a trend towards improvement but were not significant. The authors themselves point out the limits: small samples and differences between studies. More and larger trials are needed.
Oral vs topical: what each one does
| Topical (serum or cream) | Oral (supplement) | |
|---|---|---|
| Where it acts | Mainly on the surface of the skin | From the inside, after digestion and absorption |
| What it does | Attracts water to the outer layer; immediate feeling of hydration | Trials measure changes in hydration and elasticity after weeks |
| When you notice it | Minutes after applying | Studies measure results after several weeks of daily use |
| Best use | Daily routine, especially on damp skin | As a complement to topical care, not a substitute |
How to read the evidence honestly
- It is promising, not definitive. Seven trials is a small base. The results are consistent in direction, but the studies are small.
- There is no authorised health claim. The European Union has not authorised any health claim for hyaluronic acid. That is why responsible brands can talk about what studies have measured, but cannot promise effects.
- Combination matters. Hyaluronic acid works on the hydration side of skin. The structural side depends on collagen and on nutrients such as vitamin C, which contributes to normal collagen formation for the normal function of skin. To understand the structural side, read the science-backed benefits of collagen.
Where Skin Code fits
Skin Code contains 120 mg of hyaluronic acid per stick, the amount most used in the studies, together with 10 g of hydrolysed fish collagen, 100 mg of coenzyme Q10 and vitamin C, zinc and vitamin A. Vitamin C contributes to normal collagen formation for the normal function of skin, and zinc and vitamin A contribute to the maintenance of normal skin. It is designed to be taken daily for at least three months, in line with the timeframes studied. If you want to know how long it takes to see changes, read how long collagen takes to work.
Frequently asked questions
Does oral hyaluronic acid really work?
A 2025 meta-analysis of 7 trials found significant improvements in skin hydration, elasticity and wrinkle depth. The evidence is promising but based on small studies.
How much hyaluronic acid should you take a day?
Most studies used around 120 mg a day. Follow the dose on the product label.
Is it better to take hyaluronic acid or apply it?
They do different things. Topical hydrates the surface immediately; oral is studied for changes over weeks. They are complementary.
How long does oral hyaluronic acid take to work?
Trials measure results after several weeks of daily intake, typically between 4 and 12. Allow at least two to three months.
Sources
- Amin P, Sarabi A, Choe S, Scott S, Suh S, Mesinkovska NA. Oral hyaluronic acid supplement: efficacy in skin hydration, elasticity, and wrinkle depth reduction. Journal of Drugs in Dermatology, 2025.
- Kawada C, Yoshida T, Yoshida H, et al. Ingested hyaluronan moisturizes dry skin. Nutrition Journal, 2014.
- European Commission. EU Register of nutrition and health claims.
This article is for information only and does not replace medical advice. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle.