Peptides: Uses, Evidence and Cautions

Q: Can Peptides be combined with other skincare?

It is commonly paired with Sunscreen, niacinamide , hyaluronic acid, ceramides, retinoids (on alternate nights if sensitive); introduce one new active at a time and stop if irritation develops.

Peptides in skincare are short chains of amino acids designed as messengers: signal peptides aim to prompt collagen production, carrier peptides deliver trace elements such as copper, and neurotransmitter-inhibiting peptides aim to reduce muscle contraction signals. They are usually well tolerated, but many marketed peptides have little published clinical testing.

Key Facts

What it is: Short chains of amino acids used in skincare as messengers intended to support collagen, firmness and skin repair.
Also called: Signal peptides; carrier peptides; neurotransmitter-inhibiting peptides; e.g. palmitoyl pentapeptide-4, acetyl hexapeptide-8, copper tripeptide-1
Pairs with: Sunscreen, niacinamide, hyaluronic acid, ceramides, retinoids (on alternate nights if sensitive)
Who should take care: Peptides are usually well tolerated.
In Singapore: Peptides are common cosmetic ingredients in serums and creams sold in Singapore.

What are peptides and what do they do?

Peptides are short chains of amino acids, the building blocks of proteins. Cosmetic peptides are grouped by intended action. Signal peptides, such as palmitoyl pentapeptide-4, mimic fragments of collagen and are designed to prompt fibroblasts to produce more matrix. Carrier peptides, such as copper tripeptide-1, deliver trace elements involved in wound repair. Neurotransmitter-inhibiting peptides, such as acetyl hexapeptide-8, are designed to reduce muscle contraction signals, although their effect is far milder than injected botulinum toxin. Many peptides are attached to fatty acids to improve penetration. They are generally gentle, which makes them useful for sensitive skin that does not tolerate retinoids. [1]

A woman by a window, hand resting against her cheek, skin evenly lit

“Peptides are not a substitute for medical treatment of skin conditions, and expectations should be modest.”
Dr Sin YongOn topical peptides

What does the evidence show?

A systematic review of peptides marketed to stimulate collagen found that many had little or no published clinical testing, and those tested were often studied in small, short, manufacturer-funded trials. More recent meta-analyses suggest modest improvements in wrinkles and elasticity, mainly with combined formulations. Laboratory data are stronger than clinical data. Peptides are a gentle supporting option, with the effect varying greatly by specific peptide and product.

Who should avoid peptides?

Peptides are usually well tolerated. Anyone with a history of reactions to cosmetic products should patch test first, as other formula ingredients may irritate. Copper peptides may not suit people with copper sensitivity. Peptides are not a substitute for medical treatment of skin conditions, and expectations should be modest.

Are peptides available in Singapore?

Peptides are common cosmetic ingredients in serums and creams sold in Singapore. Cosmetic products are notified to the Health Sciences Authority rather than individually approved, so peptide type and concentration vary and are often not disclosed. Injectable peptide products are a different category and should only be discussed with a doctor.

If a dark patch, breakout or irritation is not responding to what you are using, the next step is a diagnosis rather than another product. See the Skin A–Z library for related ingredients.

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Questions Patients Actually Ask

What are Peptides used for?+

Short chains of amino acids used in skincare as messengers intended to support collagen, firmness and skin repair.

Who should avoid Peptides?+

Can Peptides be combined with other skincare?+

It is commonly paired with Sunscreen, niacinamide, hyaluronic acid, ceramides, retinoids (on alternate nights if sensitive); introduce one new active at a time and stop if irritation develops.

Do peptides in skincare actually work?+

Evidence varies. Cosmetic peptides are designed as messengers, such as signal peptides that aim to prompt collagen production, but many marketed peptides have little published clinical testing. They are usually well tolerated and are better seen as supportive than as a replacement for sunscreen or medical treatment.

What should I look for on a peptide product label?+

Peptides appear under names such as palmitoyl pentapeptide-4, acetyl hexapeptide-8 or copper tripeptide-1. A name on the label does not show how much is present or whether it has clinical testing, so published evidence is a better guide than marketing claims.

Medically reviewed by Dr Sin Yong, MBBS (NUS), MRCS (Edinburgh) · Last updated 7 October 2026 · Editorial policy

Availability in Singapore

Signal, carrier and neurotransmitter-inhibiting peptides such as palmitoyl pentapeptide, copper tripeptide and acetyl hexapeptide are cosmetic ingredients in Singapore. Products are notified to the HSA under the Health Products Act and must comply with the ASEAN Cosmetic Directive annexes, which set no concentration limit for these peptides. Claims must remain cosmetic. Injectable peptide products are not cosmetics and would require separate HSA approval. A doctor assesses whether fine lines, laxity or texture are the concern before advising where peptide skincare fits alongside treatment. Source.