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This is the chemical symbol for Silicon, not a standalone INCI ingredient. Silicon is a common element found in many cosmetic ingredients, such as Silica (for texture) or various silicones like Dimethicone (for skin conditioning and barrier formation).
No specific concern data available
Safety summary
As 'SI' is a chemical symbol and not an ingredient, its safety profile is not applicable. The safety of silicon-containing ingredients depends on the specific compound and its use.
For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.