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This is not a recognized INCI name for a single ingredient. It refers to 'C-ester' (likely a Vitamin C derivative) and 'Horsetail' (a botanical extract), which can offer antioxidant and soothing benefits.
No specific concern data available
Safety summary
Cannot provide a single safety summary for this phrase. Individual ingredients like Vitamin C derivatives and botanical extracts are generally safe, but specific formulations can vary.
For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.