COSRX The Retinol 0.5 Oil

Start small and slow!
During your evening routine, apply 1 to 2 drops to hand and tap with fingertips from inside out, let absorb. Limit initial use to three times per week; gradually increase frequency to every other night, use as tolerated.

* Have an ‘adaption period’ when using retinol

Week 1-2
– Frequency : use only 2~3 times a week at night 
– How to Use : After cleansing, at the moisturiser step, apply 1-2 drops to areas of concern.

Week 3~
– Frequency : may apply every other day at night
– How to use : After cleansing, at the moisturiser step, may spread over the entire face.

* The “building tolerance” phase can be shortened or extended depending on individual differences
* Maintain this phase until no discomfort is experienced. 
* Gradually increase frequency and areas of application.