Science
Mechanism of Action
Hydroxyisoleucine exerts its influence at a cellular level by enhancing Akt phosphorylation and mitigating the activation of several pro-inflammatory signaling pathways, including Jun N-terminal kinase (JNK)1/2, extracellular signal-regulated kinase (ERK)1/2, p38 mitogen-activated protein kinase (MAPK), and nuclear factor (NF)-κB. In cellular models, it has been observed to decrease levels of inflammatory markers like TNF-α and MCP-1 in macrophages and adipocytes. For skin-specific benefits, a patent suggests its topical application may combat natural signs of aging and induce the synthesis of SIRT proteins in skin cells, though the precise biochemical mechanisms directly on skin physiology are not fully detailed in available research.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Hydroxyisoleucine is readily soluble in water (≥26 mg/ml, up to 100 mg/mL at 679.49 mM) and methyl/95% alcohol. In instances of precipitation or phase separation during formulation, heat or sonication may be utilized to assist dissolution. The optimal pH range for the ingredient's stability within skincare formulations is not precisely defined, though general cosmetic products typically maintain a pH between 4.5-6.5.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) has not specifically assessed pure Hydroxyisoleucine for cosmetic use. However, Fenugreek seed extracts, a common source containing a minimum of 40% 4-OHIle, have been deemed non-genotoxic by the U.S. Food and Drug Administration (FDA) when used as food ingredients. Oral intake of 4-Hydroxyisoleucine is generally well-tolerated, even at higher doses, with a low probability of drug interactions via Pgp inhibition or substrate activity.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While Hydroxyisoleucine demonstrates compelling metabolic and anti-inflammatory effects in cellular and animal models, and a patent suggests its potential for skin aging, more direct and detailed human topical clinical data are required for a definitive skincare verdict.
Related
Similar Ingredients
Finding similar ingredients…