​The COSRX Retinol 0.1 cream is a great beginner retinol. Within 2 weeks of consistent of application (I use it about 3-4 nights a week), my skin texture has improved noticeably. After about 2-3 months of use there is a purge period where you'll experience an influx of pimples, however, the results are well worth it. Skin discoloration, pimples, texture went away after the purge period and this is the product to thank for that. I would encourage people new to retinol to use this about 2-3 times during the night ONLY for the first week then work your way up to 3-4 times a night per week. The only downside is that this has a pretty strong sulfur smell, but after 5-10 minutes it fades away and I can't smell it anymore. As always, don't use this product during the same routine you use other actives. Great product at an affordable price. Will buy again!