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This is not an INCI ingredient but a general category or claim. It refers to preservatives that are synthetically produced or not found naturally, used to prevent microbial growth and extend product shelf life.
No specific concern data available
Safety summary
Not an ingredient, so no specific safety summary applies. The safety of preservatives depends on the specific chemical used and its concentration, not whether it is "natural" or "unnatural."
For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.