The specific percentage of retinol in the INNISFREE RETINOL CICA REPAIR AMPOULE is not explicitly mentioned in the provided reviews. However, several reviewers note that the product contains a "low concentration" of retinol, which is suitable for beginners or those with sensitive skin. This suggests that the retinol concentration is relatively mild to minimize irritation and allow users to gradually introduce retinol into their skincare routine. **Related questions for you**