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Hello guys! I havebeen using tretinoin for some few weeksand my skin is reallydry. So i decided to buy an oil based moisturiser (non comodogenic) and it worked amazing at relieving irritation and dryness. However i found out it contained retinol! So perhaps the retinol makes the tretinoin ineffective? Thats why my face isnt dry anymore? Does anyone know if retinol makes tretinoin lose it efficacy in preventing acne?