Peptides

Thioctoyl Tripeptide-35

INCI: THIOCTOYL TRIPEPTIDE-35

Reviewed by Emma · Last updated 2 Jun 2026

Also known as: Thioctoyl Tripeptide-35

A peptide-based antioxidant designed to protect skin from environmental stress and oxidative damage

Best For Skin Types

All, Mature, Sensitive

Addresses

Fine lines, Dryness, Sensitivity

Usage Frequency

Daily

What Is Thioctoyl Tripeptide-35?

Thioctoyl Tripeptide-35 is a synthetic peptide—a short chain of amino acids—combined with thioctic acid (also known as alpha-lipoic acid), a potent antioxidant compound. This ingredient is designed to work at the cellular level to neutralise free radicals and protect skin from oxidative stress caused by environmental factors such as UV exposure and pollution.

In skincare formulations, it functions primarily as an antioxidant and skin protectant. Some formulations also utilise it for hair conditioning and mild skin-lightening properties, though its primary role in most products is protective rather than corrective.

Benefits for Your Skin

How It Works

Thioctoyl Tripeptide-35 functions through two mechanisms. The thioctic acid component is a lipophilic antioxidant, meaning it can penetrate both water and fat-based environments in the skin. It neutralises free radicals—unstable molecules that damage skin cells and accelerate ageing. The peptide portion may interact with skin cells to reinforce barrier function and support cellular resilience.

By reducing oxidative stress, this ingredient helps protect against cumulative environmental damage and may support the skin's natural repair processes, particularly relevant given that oxidative damage is implicated in collagen loss and structural changes associated with ageing.

Clinical Evidence & References

The ingredient is supported by established science around antioxidant function and peptide chemistry. Research confirms that oxidative stress from sun exposure and environmental factors is a major contributor to skin ageing, characterised by loss of dermal collagen, epidermal thinning, and visible signs such as wrinkles and pigmentary irregularities. Antioxidants theoretically help mitigate this damage.

However, specific clinical evidence for Thioctoyl Tripeptide-35 itself in published skincare studies is limited. While the individual components—thioctic acid and peptides—have documented benefits, the precise efficacy of this particular combination in topical formulations requires more robust clinical validation. It is best viewed as a protective ingredient within a broader skincare strategy rather than a standalone solution.

How to Use

Thioctoyl Tripeptide-35 is typically included in serums, moisturisers, and protective products. It integrates well into most skincare routines and can be layered with other actives. Apply to clean skin as part of your morning routine to maximise protection against daily environmental exposure, or incorporate into evening formulations to support overnight skin repair. There is no need for special timing or sequencing; use it as directed on the product label.

Safety & Precautions

Thioctoyl Tripeptide-35 is generally well-tolerated and suitable for most skin types, including sensitive skin. No significant cautions or contraindications are commonly reported.

Frequently Asked Questions

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