Peptides

What it is

A peptide is simply a short chain of amino acids, the building blocks of proteins. In skincare, specific peptide sequences are selected for specific signaling roles — some are associated with supporting the skin's own collagen-related activity, others act as carriers for trace elements, and others are designed to soften the look of expression lines. 'Peptides' as a catch-all marketing term covers a genuinely wide and varied ingredient category.

What it does

Peptides act as messengers that can prompt skin cells to behave in specific ways, such as supporting the skin's structural proteins. Different peptide types are formulated for different purposes.

Who it’s for

Broadly suitable, including for people newer to actives who want a lower-irritation way to add a 'firming' or 'anti-aging' step to their routine.

Possible benefits

• Associated with supporting the skin's structural proteins over time
• Generally well tolerated, including on sensitive skin
• Wide variety of peptide types allows targeting different concerns
• Layers easily with most other actives

Irritation & compatibility considerations

Peptides are broadly considered non-irritating relative to acids or retinoids. The main practical consideration is formulation stability — peptides are proteins and can be broken down by strong acids or extreme pH in the same product, so sequencing (or choosing formulas designed to be stable together) matters more than any direct safety concern.

How it fits into a routine

Most commonly used in serums or moisturizers, morning or night, as a long-term layer in a routine rather than a fast-acting treatment. Works well alongside niacinamide, hyaluronic acid, and most other everyday actives.