Honestly, trying not to hurt myself so doing lighter weights. Off all "supplements" for the first time in a long time, so finding my groove.
In that case, your routine is much better than mine. I'm using lighter weights like you are, after a way too long break, but I am doing 10-12 reps. I get a little muscle soreness for a day or so on this routine. It must be working.
As for supplements, it would be dishonest for me to claim I was not using "supplements", especially since I am on doctor prescribed HRT and probably will be the rest of my life....or until I get sick and tired of sticking a needle in my butt every Monday. For over-the-counter supplements, I take Creatine and occasionally have a protein drink. Lately, if been using Vegan pea protein (I'm not vegan). It tastes surprisingly good.