Ingredients
What is hyaluronic acid and what does it do?
Hyaluronic acid is a molecule found naturally in skin that can hold many times its own weight in water. In serums it is mainly used for hydration and a plumper look.
At a glance
- Best for
- All skin types; especially dry, dehydrated skin and skin dried out by actives
- Typical strength
- Usually 0.1–2%; blends of different molecular weights are common
- When
- Morning and evening, as a serum on damp skin, followed by moisturiser
- Pairs well with
- Almost everything: niacinamide, retinol, acids, vitamin C, ceramides
- Caution
- Don't leave it alone in very dry air; seal it with a moisturiser
What is hyaluronic acid?
Hyaluronic acid (usually listed as sodium hyaluronate) is a sugar molecule that occurs naturally in the deeper layers of skin. The skin's own supply decreases with age. Hyaluronic acid in cosmetics does not replace that loss, but it holds moisture on the surface and upper layers of skin and gives an instantly plumper look.
Benefits for skin
Hyaluronic acid is a humectant: it draws water from the environment and from deeper layers of skin to the surface. Tightness is reduced, fine dehydration lines look less visible and make-up sits more smoothly.
Low-molecular-weight forms reach slightly deeper, while high-molecular-weight forms create a protective film on the surface. That is why many serums combine several weights.
How to use it
For best results, apply a few drops while skin is still slightly damp after cleansing, then seal it straight away with moisturiser so the water it attracts doesn't evaporate.
It can be used morning and evening. If you use retinol or acids, hyaluronic acid helps balance their drying effect.
Things to watch out for
Hyaluronic acid has a very low risk of allergic reactions and can be used during pregnancy. In very dry air, used without a moisturiser on top, it can sometimes make skin feel tighter. If you notice stinging or redness, the cause is usually another ingredient in the formula.
Frequently asked questions
Is hyaluronic acid good for oily skin?
Yes. It is a water-based humectant, not an oil, and does not clog pores. Oily skin can be dehydrated too, and a light hyaluronic acid serum adds moisture without extra shine.
Is hyaluronic acid the same as fillers?
No. Fillers use a cross-linked form injected into the skin. Hyaluronic acid in creams does not add volume; it holds moisture on the surface for a plumper look.
When do you apply hyaluronic acid in your routine?
After cleansing and toner, before moisturiser. In the morning, sunscreen goes last.
This page is general information, not medical advice. If you have a skin condition, are pregnant or take regular medication, talk to a dermatologist before starting a new active ingredient.
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