Science
Mechanism of Action
As a mycosporine-like amino acid (MAA), Shinorine primarily absorbs UVA/UVB radiation with a peak absorption around 334 nm, converting it into harmless heat to prevent cellular damage to DNA, proteins, and lipids. This upstream UV filtering action indirectly minimizes the generation of reactive oxygen species (ROS), thereby reducing oxidative stress, lipid peroxidation, and the activation of inflammatory pathways like COX-2. Shinorine also acts as a direct antioxidant by antagonizing Keap1-Nrf2 binding, bolstering cellular defense mechanisms. Furthermore, it promotes the biosynthesis of collagen in skin cells, contributing to improved skin structure and firmness.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Reduces UV-induced reactive oxygen species (ROS) generation by approximately 30–60%, lipid peroxidation, and DNA damage, while maintaining cell viability in human keratinocytes and fibroblasts at concentrations of 10-100 µM.
- 02 Demonstrated concentration-dependent protection against UV-A exposure at a concentration of 5 µg/mL.
- 03 Decreased COX-2 expression in HaCaT human keratinocytes at 0.03 mM.
- 04 When included as part of a total MAA blend (Helioguard®365 at 0.005% total MAA), it reduced lipid peroxidation, enhanced skin firmness and smoothness, and contributed to preventing premature skin aging in human skin.
- 05 Stimulates collagen synthesis in human skin cells, providing anti-wrinkling effects.
- 06 Activated NF-κB up to 33.63% at 200 µg/mL in unstimulated THP-1-Blue cells and showed dose-dependent activation from 12.5–100 µg/mL, with a slight superinduction in LPS-stimulated cells, suggesting immunomodulatory activity.
- 07 Suppressed the Kyn/Trp ratio by up to 23.1% in LPS-stimulated cells at concentrations of 12.5, 25, and 100 µg/mL, indicating further immunomodulatory effects.
Transparency
Dusting Analysis
Information regarding dusting potential for Shinorine is not available in the provided research data.
The Formula
Formulation
Stability
Shinorine demonstrates robust UV absorption stability across a broad pH range of 4-10 and is generally stable up to 60°C. However, liquid forms are susceptible to oxidation, potentially leading to pigment deepening. Optimal stability is observed in acidic environments, with instability noted in alkaline conditions. During crystallization, temperatures below 55°C are advised to preserve quality and prevent oxidation.
Conflicts
- Alkaline environments (potential for instability and oxidation)
Safety
Safety Profile
Shinorine, as an MAA, is reported to have low toxicity and is considered safe for regular topical application. However, a specific maximum concentration for cosmetic use is not formally regulated by CIR, SCCS, or FDA as a standalone ingredient. While some UV filters can be permitted up to 10%, this guidance is not specific to Shinorine itself. Caution is advised regarding potential toxicity to aquatic organisms and if ingested or inhaled.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Shinorine offers significant value as a multi-functional ingredient, providing natural UV protection, potent antioxidant benefits, and anti-aging effects through collagen synthesis, making it ideal for comprehensive skin defense formulations.
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