Science
Mechanism of Action
Melatonin penetrates deeply into the skin to the dermis and mitochondria, exerting its effects primarily as a powerful antioxidant by directly scavenging harmful reactive oxygen species (ROS) and indirectly by boosting the skin's natural antioxidant defense system through NRF2 activation, which upregulates enzymes like SOD1, GPX-1, and CAT. It also exhibits anti-inflammatory properties, minimizing ROS-mediated responses, and binds to specific melatonin receptors (MT1, MT2, QR2/MT3) in the skin to mediate its diverse biological benefits, including support for skin regeneration, barrier repair, and collagen/elastin production. Furthermore, it may contribute to regulating melanin synthesis for a more uniform complexion.
Research
Clinical Evidence
High confidence2.5%
Key findings
- 01 Demonstrated significant protection against UV radiation, resulting in a 17.4% reduction in mean redness compared to placebo-treated areas.
- 02 Achieved superior efficacy when combined with antioxidants, leading to a 32.2% lower mean redness value compared to placebo.
- 03 In women with mild to moderate skin aging, showed notable anti-aging effects over two months, including a 31% reduction in coarse wrinkle volume, an 18% reduction in fine wrinkle volume, and a 17% decrease in melanin content.
- 04 Improved sebum levels, indicating potential benefits for oily or combination skin concerns.
Transparency
Dusting Analysis
Topical melatonin concentrations from 0.5% to 12.5% exhibit a clear, direct dose-response relationship with statistically significant beneficial effects. Therefore, formulations containing less than 0.5% melatonin may not deliver the clinically observed skin benefits.
The Formula
Formulation
Stability
Melatonin's primary degradation pathway is oxidation, necessitating the inclusion of antioxidant excipients in formulations. Physical formulation stability, such as maintaining a 20% oil phase, is considered crucial for preventing oxidation. Melatonin exhibits enhanced stability at lower pH values, with optimal retention observed at pH 1 and good stability at pH 3.5.
Synergies
- Vitamin C
- Vitamin E
- Antioxidant excipients (general)
Safety
Safety Profile
Topical application of high doses (up to 5.6g) has been reported to be well-tolerated without local or systemic side effects, generally considered gentle and non-irritating to the skin. While the SCCS reviewed melatonin for hair products at 0.0033% w/w, it noted insufficient data for dermal absorption quantification in that context. Melatonin, as an over-the-counter supplement, is not fully regulated by the FDA. Concerns have been raised about potential systemic absorption impacting the sleep/wake cycle and, in rare instances (primarily from injections), darkening of moles or freckles.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Melatonin is a valuable ingredient, demonstrating robust antioxidant, anti-inflammatory, and anti-aging benefits with strong clinical backing and broad skin compatibility.
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