Based on the reviews provided, the RETINOL EYE CREAM by BONCEPT is noted to contain retinol, but the exact concentration is not specified. For a product with a higher concentration of retinol, you might want to look for eye creams that specifically mention a higher percentage of retinol or retinol derivatives like retinyl palmitate or retinyl acetate. It's important to start with a lower concentration if you're new to retinol and gradually increase to avoid irritation.

The provided reviews do not specify the exact percentage of retinol in the RETINOL EYE CREAM by BONCEPT. However, they do mention that the product contains retinol, with some reviews noting that it has a low concentration suitable for beginners or those with sensitive skin. For precise information on the retinol percentage, it would be best to refer to the product packaging or official product description.