What Are Peptides in Skincare? The Science Behind the Most Intelligent Anti-Ageing Ingredient

Everyone is talking about peptides, but what do they really do, and do they really work for anti-ageing?

Unlike many trending ingredients, peptides are not a marketing invention. They are short chains of amino acids that function as biological messengers within the skin, regulating processes such as collagen production, repair, inflammation and structural support.

As we age, collagen declines, the dermal matrix weakens and skin gradually loses firmness and resilience. Strategic use of specific peptides can help stimulate collagen, reinforce structural integrity and support long-term skin longevity.

For over four decades in aesthetic medicine, Dr Sebagh has viewed peptides not as trends, but as an integral part of his 'Ageing-Maintenance' strategy, guiding the skin to function optimally for longer, rather than attempting to aggressively reverse time.

This clinical guide will explain:

• What peptides are
• How they work in the skin
• Which peptides support collagen and firmness
• And how they fit into a long-term anti-ageing protocol
• Where to find them in Dr Sebagh formulas.

Because skin longevity is not about chasing the latest ingredient.
It is about understanding skin biology, and working with it intelligently.

What Are Peptides?

Peptides are short chains of amino acids, the building blocks of proteins such as collagen and elastin.

In skincare, they function as biological messengers. They send very specific instructions to the skin, such as:

• Produce more collagen
• Strengthen the dermal matrix
• Repair damage
• Reduce inflammation
• Improve firmness
• Decongest and reduce puffiness

Think of peptides as intelligent signals. They tell the skin exactly what to do.

Do Peptides Really Work?

Yes, when formulated correctly.

Peptides work by mimicking the body’s natural signalling mechanisms. When the skin detects certain peptides, it responds as though repair or rebuilding is required.

However, not all peptides are equal.

Their effectiveness depends on:

• The type of peptide
• Concentration
• Stability in the formula
• Delivery system
• The protocol they are used within

It is not a single ingredient that transforms skin. It is formulation intelligence.

The Peptides Used in Dr Sebagh’s Skincare

Peptides are never added for trend value.
They are selected with intention, depending on the treatment area and function required.

Below is a guide to the peptides used across the range and why they matter.

Palmitoyl Pentapeptide-4

A classic collagen-supporting signal peptide

Found in:

• Deep Exfoliating Mask
• Deep Exfoliating Mask Sensitive Skin
• Serum Repair
• Vital Cream

This is one of the most established signal peptides in skincare. It supports dermal structure, enhances renewal and helps smooth wrinkles by encouraging collagen production.

It is a foundational anti-ageing peptide, ideal for maintaining firmness over time.

Acetyl Tetrapeptide-2

Skin regeneration & luminosity support

Found in:

• Luminous Glow Cream

This peptide stimulates regeneration and helps restore radiance. It supports skin density while improving overall luminosity, making it particularly effective in dull, fatigued skin.

Advanced Expression-Smoothing Peptides

Found in:

• Platinum Gold Elixir

Includes:

• Acetyl Hexapeptide-8
• Acetyl Tetrapeptide-59 Amido Ethoxyethoxyacetyl Dipeptide-67

These advanced peptides are selected to soften expression lines and support skin quality. Combined with colloidal platinum and gold, they work to improve smoothness and visible refinement.

Collagen-Reinforcing Peptides

Found in:

• Supreme Maintenance Youth Serum

Includes:

• Tripeptide-10 Citrulline
• Tripeptide-1

These peptides help reinforce the dermal matrix and improve elasticity. They support structural integrity,  key in maintaining youthful density over time.

Neck & Jawline Firming Peptides

Found in:

• Supreme Neck Lift

Includes:

• Hexapeptide-12
• Palmitoyl Tripeptide-1

The neck ages differently from the face. These peptides are specifically selected to improve firmness and resilience in thinner, more fragile skin.

The Eye Area: A True Peptide Complex

Found in:

• Supreme Eye Serum

Includes:

• Palmitoyl Tripeptide-1
• Palmitoyl Tetrapeptide-7
• Acetyl Tetrapeptide-5
• Dipeptide-2
• Palmitoyl Tripeptide-8

The eye area requires precision.

This peptide complex targets:

• Dark circles
• Puffiness
• Inflammation
• Fine lines

While simultaneously reinforcing this delicate skin barrier.

To learn more about the delicate eye area and how to care for it, discover Dr Sebagh's expert guides here.

Are Peptides Better Than Retinol?

Peptides and retinol work differently.

• Retinol accelerates cellular turnover.
• Peptides signal repair and rebuilding.

Peptides are often better tolerated and ideal for sensitive skin or for long-term maintenance strategies. In many advanced protocols, they work beautifully alongside other actives.

To learn more about retinol, read Dr Sebagh's expert guide here.

The Philosophy: Ageing Maintenance

For over 40 years, Dr Sebagh’s philosophy has centred on ageing maintenance, guiding time rather than fighting it aggressively.

Peptides fit perfectly within this approach.

They are subtle.
They are intelligent.
They respect skin biology.

Science does not follow trends.
It anticipates them.