Science
Mechanism of Action
On the skin, Guanosine functions by stimulating hyaluronan synthase 3 (HAS3) in human epidermal cells, leading to increased synthesis of hyaluronic acid. This action improves skin hydration and strengthens the skin's natural barrier. It exhibits anti-inflammatory effects by reducing pro-inflammatory markers such as interleukin-1 alpha (IL-1a) and matrix metalloproteinases (MMP-1, MMP-9). Furthermore, Guanosine promotes collagen fiber deposition, supporting tissue regeneration and contributing to anti-aging effects. As a fundamental nucleoside, it also plays a role in cellular signaling pathways.
Research
Clinical Evidence
Medium confidence0.3%
Key findings
- 01 An in vitro study on human epidermis demonstrated that guanosine at 0.005% (50 µg/ml) stimulated hyaluronan synthase 3 (HAS3) by an impressive 228%, directly enhancing hyaluronic acid production and improving skin hydration.
- 02 In a murine wound healing model, 25 µM guanosine (approximately 0.0007%) promoted significant anti-inflammatory responses and increased collagen deposition, accelerating the regeneration of epithelial and dermal tissues.
Transparency
Dusting Analysis
Guanosine demonstrates significant biological activity at concentrations starting from 0.005%, with patent-suggested cosmetic formulations typically incorporating it between 0.3% and 1.5%, and up to 5%. This range indicates that it is used at concentrations expected to exert a measurable, functional effect, rather than being included minimally for marketing claims.
The Formula
Formulation
Stability
Guanosine exhibits very slight solubility in cold water but is soluble in boiling water, dilute mineral acids, and dilute bases. It is insoluble in common organic solvents like alcohol, ether, chloroform, and benzene. Optimal stability in cosmetic formulations is expected within a neutral pH range (6.0-8.0). While isolated guanosine hydrogels have limited stability, mixtures with derivatives like 5'-guanosine monophosphate can form stable gels. Cosmetic compositions are suggested to include guanosine from 0.001% to 5% by weight, with a focus on 0.3% to 1.5% for efficacy.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) has not conducted a specific safety review for Guanosine. The CIR deferred evaluation of 'Guanine' (the nucleobase) as a color additive, referencing FDA assessment. No specific SCCS assessment for Guanosine has been identified. It is listed in the EPA Substance Registry System. A patent suggests safe use in cosmetic formulations up to 5%.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Guanosine is a valuable ingredient for advanced skincare, offering multifaceted benefits from enhanced hydration and skin barrier support to anti-inflammatory and collagen-boosting effects, making it suitable for a wide range of skin concerns.
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References
Sources