I’ve bought this once when it first came out, 2025? My skin was looking good...

I’ve bought this once when it first came out, 2025? My skin was looking good and I wasn’t sure which product was making it so. This was expensive so after I finished, I didn’t buy again. I had a 15% off offer and I bought again and my skin is looking good again. Maybe… it’s this!! More 15% off SkinCeuticals. I will buy again. You just need a very small amount.