Cleanse Your Skin And Make It Dry Before Applying Retinol. Apply Retinol Face Serums Few Drops With Help Of Dropper On Your Fingertips. Gently Rub The Serum Onto The Skin Avoiding Eyes, Mouth Nose. Patch Test: Before Using Retinol On Your Face, Apply A Small Amount To The Inside Of Your Elbow And Wait 24 Hours To See If You Have A Reaction. Ul LiBFeature Retinol Face SerumBFeature Vitamin C Face Serum