The BLACK SNAIL RETINOL AMPOULE by Dr.G contains retinol, a well-known ingredient for its anti-aging and skin-renewing properties. However, specific percentages of retinol in this product are not disclosed in the reviews. Users have reported varying experiences with the product, indicating that it may have a lower concentration of retinol, which could explain the gentler effects experienced by some users. For those new to retinol or with sensitive skin, this product might be a suitable starting point due to its reported mildness.