@Shelbylynn I used retinol and I don't know if it was a coincidence or not, but the next day I woke up with 8/10 T, when the day before it was at a 1/10. I never touched it again. Also, I hadn't gone anywhere or done anything else to give me a spike. The only thing I had done/used differently that day, was apply retinol cream to my face.