Quick answerSome evidence
They do different jobs, so you rarely have to choose. Hyaluronic acid hydrates right away and plumps the look of fine lines for hours. Peptides work slowly on the look of firmness and smoothness over weeks. Dehydrated skin: start with hyaluronic acid. Early signs of ageing: add peptides. Many serums combine both.
Side by side
| Peptides | Hyaluronic acid | |
|---|---|---|
| Main job | Look of firmness and fine lines | Surface hydration and plumpness |
| Speed | Weeks (8–12) | Minutes to hours |
| Evidence | Small trials, modest effects | Well established for hydration |
| Irritation | Very low | Very low |
| Best for | Prevention, early lines | Dehydrated, tight skin |
How to layer them
Apply the thinnest texture first. A typical order: cleanse, hyaluronic acid on slightly damp skin, peptide serum, moisturizer, then sunscreen in the morning. Or save a step with a serum that contains both, such as The Ordinary Multi-Peptide + HA.
Who should pick which
- Tight, flaky or dehydrated skin: hyaluronic acid plus a good moisturizer.
- Late 20s onwards wanting prevention: peptides, alongside sunscreen.
- Sensitive skin that can’t take retinoids: peptides are one of the gentlest options.
Where copper peptides fit
Copper peptides (GHK-Cu) are a separate category with more lab data. See do copper peptides work? and copper peptides vs retinol.