We use it like this in Korea!! October 18 2025, by numberskin Unlock Youthful Radiance: My Honest Review of CKD Retino Collagen Gua Sha Neck Cream for a Smoother, Firmer Neck! Retino Collagen Low Molecular 300 Gua Sha Neck Cream 50ml (CKD) Korean consumers rated it like this!! In Korea, the CKD Retino Collagen... Read more