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00:00 Start 01:03 Criteria for choosing the top 4 recommended retinols 02:12 Top 4 recommended retinols 14:23 What are retinol products that are not recommended? 18:39 You can do it yourself! How to distinguish effective retinol serums #Ingredient analysis #Retinol #Serum ▼Sumisho Official LINE & Email Magazine Sumisho, an active cosmetics developer, is broadcasting scientific stories about beauty and cosmetics that can be smartly and steadily beautiful, which cannot be conveyed on YouTube. Now, as a free bonus, we are giving away the [Popular sunscreen UV protection experiment report complete version (including unpublished data)]. It also includes tips on choosing a sunscreen, so you will no longer have to worry about choosing a sunscreen. Also, if you have any questions about beauty, cosmetics, health foods, etc., please request them on LINE or email magazine. We will definitely read your messages! Click here to register for LINE https://lin.ee/tCr1Odf If you have already registered, we apologize for the inconvenience, but please block us once and then re-register. Subscribe to the newsletter here: https://smicos.net/p/r/xIZTq2uA This newsletter was renewed in July 2024. If you have already subscribed, please subscribe again from the above link. ▼ About Sumisho Born in Kanto in 1986 and raised in Kansai. Graduated from the Master's course in Materials Engineering at the Graduate School of Engineering Science, Kyoto Institute of Technology. At university, he synthesized and evaluated new surfactants. He spent 7 years in the cosmetics OEM department of a major chemical manufacturer, developing formulations for beauty serums, pharmaceutical affairs, and creating patents. After going independent, he became independent with the desire to convey the ingredients and mechanisms of cosmetics in an easy-to-understand manner and to help people achieve beauty in the shortest time possible, and disseminates scientific beauty information. He is supported by a total of 600,000 followers on SNS. He currently produces the skin care brand "Sprause", which is simple but does not compromise on effectiveness, with the concept of "less, but better". ▼ Click here for the official Sprause shop: https://esouplesse.com