Oral hyaluronic acid: hydration from a capsule, or clever marketing?

Hyaluronic acid is often described as a water-binding molecule, which explains its place in serums and injectable treatments. It also appears in drinks and capsules. But a molecule applied to skin, placed beneath it or swallowed is not doing the same thing in the same place. Oral hyaluronic acid needs its own human evidence.

In a 12-week double-blind trial of 40 adults aged 35 to 64, a daily 120 mg oral hyaluronan supplement was compared with placebo. The researchers reported improvements in measures of dry skin and wrinkles [1]. Another randomised trial involving 129 women reported better skin hydration after several weeks of oral hyaluronic acid, with some other changes appearing later [2]. These findings offer a real clinical signal, rather than relying solely on the ingredient's ability to bind water in a laboratory.

Still, these studies do not establish that every oral HA product will visibly plump every face. The trials differ in molecular weight, formulation, participants and measurement methods. “More hydrated” on an instrument is not necessarily the same as a dramatic before-and-after photograph. Nor should oral HA be described as a substitute for moisturiser or sun protection.

The question worth asking is whether the brand gives the studied dose and form, and whether the outcome it advertises is the one the study measured. If research showed a change in hydration over 8 to 12 weeks, it would be misleading to imply an instant wrinkle-filling effect from a capsule.

For us, this is a useful reminder that an ingestible ingredient can have promising skin data while the quality of the finished-product claim still depends on precision. Skin Calm™ does not contain hyaluronic acid. We favour explaining what a formula actually contains and what each line of evidence can reasonably support.

SOURCES

1. Kawada et al. (2021), 12-week placebo-controlled oral hyaluronan study: www.mdpi.com

2. Gao et al. (2023), randomised trial of oral hyaluronic acid: pubmed.ncbi.nlm.nih.gov