Hello guys! I havebeen using tretinoin for some few weeks and 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?