Science
Mechanism of Action
This ingredient functions as a key human metabolite involved in critical post-translational protein modifications within cellular processes. Through phosphorylation, it acts as a molecular switch, regulating cellular communication and signal transduction. While its precise topical mechanism for skin conditioning is not fully detailed in the available research, its fundamental role in biological signaling suggests a potential contribution to maintaining overall skin health and function.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
O-Phosphoserine exhibits good water solubility, specifically 71 mg/mL (or 28.34 g/L) at 20°C. It is also soluble in 4 M NH4OH at 50 mg/mL with sonication, and in water at pH 7.2. For effective dissolution, particularly for concentrations such as 25 mg/mL in PBS, warming to 60°C and/or sonication may be necessary to prevent precipitation or phase separation. NMR spectral data confirms its stability in aqueous solutions across a pH range of 5.5 to 7.4.
Safety
Safety Profile
The FDA's Global Substance Registration System (GSRS) recognizes O-phospho-L-serine. The Cosmetic Ingredient Review (CIR) has not yet reviewed this ingredient for cosmetic use. GHS classifications for the raw chemical forms, such as DL-O-Phosphoserine and O-phospho-L-serine, indicate potential for skin irritation (Category 2) and serious eye irritation (Category 2) in a high percentage of reports (97.6% for DL-O-Phosphoserine), along with specific target organ toxicity (respiratory tract irritation). However, it is important to note that these classifications pertain to the pure chemical substance and may not directly reflect the safety profile of the ingredient when incorporated into diluted cosmetic formulations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Due to a lack of specific clinical efficacy studies for skin application and comprehensive safety assessments for cosmetic formulations, the overall value and suitability of O-Phosphoserine remain unclear at this time.
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References
Sources