I'm trying retinol cream again. It's a ridiculously low concentration, which I know from previous experience was enough to cause irritation. In a way, it's reassuring that it causes irritation, because it suggests to me that maybe it is being converted to retinoic acid in my skin. At any rate, I wanted to give it another try, taking it slow. I use metro gel for my rosacea. Would I put the retinol cream on after applying the metro gel (which I use at night)? And is a super low concentration of retinol enough to see any anti-aging benefits?