Acetyl Hexapeptide-1 is a synthetic cosmetic peptide used mainly in anti-aging and skin-conditioning skincare products. It belongs to the group of signal peptides, which are designed to interact with skin cells and influence biological processes such as pigmentation, inflammation, and skin aging.

What Acetyl Hexapeptide-1 is

Acetyl Hexapeptide-1 is a modified short-chain peptide (6 amino acids) with an acetyl group attached at the N-terminus, which improves its stability and skin compatibility.

It is best known in cosmetics under the trade name Melitane™, where it is used for its effects on skin tone regulation and photoaging-related pigmentation.

Main Functions

1. Skin tone modulation (anti-pigmentation support)

It is primarily used to help:

• Reduce appearance of uneven skin tone

• Support more uniform pigmentation

• Address sun-induced pigmentation changes

It is often categorized as a melanin-regulating peptide.

2. Anti-aging support

It may help reduce visible signs of aging by:

• Limiting oxidative stress in skin cells

• Supporting healthier skin cell signaling

• Improving overall skin brightness and clarity

3. Anti-inflammatory effects (mild)

Some cosmetic research suggests it can:

• Reduce low-grade inflammation in skin
• Help calm stressed or UV-exposed skin

This indirectly supports healthier-looking skin over time.

4. Photoprotection support (indirect)

It does not act as a sunscreen, but it may:

• Reduce biochemical effects of UV-induced damage

• Support skin recovery after sun exposure

Mechanism of action (simplified)

Acetyl Hexapeptide-1 works mainly by:

• Interacting with skin cell signaling pathways involved in melanogenesis (melanin production)

• Modulating inflammatory and stress-response signals

• Influencing melanocyte activity indirectly

Net effect: more balanced melanin production and improved skin appearance

Physical & chemical characteristics

• Type: Synthetic hexapeptide (6 amino acids)

• Modification: N-terminal acetylation

• Molecular weight: ~700–900 Da

• Solubility: Water-soluble

• Form in products: Serums, creams, anti-aging formulations

• Stability: Moderate; improved with encapsulation systems

Where it is used

Common applications include:

• Brightening serums

• Anti-aging creams

• Hyperpigmentation correction products

• Eye-area treatments for dark tone and dullness

Key takeaway

Acetyl Hexapeptide-1 is a cosmetic signaling peptide primarily used to help regulate skin pigmentation and improve overall skin tone and radiance, while also providing mild anti-aging and anti-inflammatory benefits.