The main difference is the type of Vitamin A they contain. Celimax Retinal Shot uses 0.1% retinal, while the Retinol Shot uses 0.1% retinol. celimax retinal may be a suitable option for people who already tolerate retinoids and want a more direct Vitamin A derivative. Beginners should introduce either product gradually and use sunscreen during the day.https://yesorabeauty.com/blogs/skincare-guides/celimax-retinal-shot-vs-retinol-shot