This is weeks after your initial question. I'm old enough to get Medicare. I did the SS-31, MOTSC, and NAD+ protocol. Didn't see any results, so I stayed on NAD+ until I used it all up. Which was quite a bit. I didn't "feel" anything for a while. I was doing 100 mg 5-7 times a week. Then one day I gave myself the injection and I "felt it" - it shocked me. Then every day after that, I felt that "rush". Maybe my body was super deficient and using it up as fast as I injected it. Maybe it was slowly fixing the deficiency. Now I do 50 mg a day 5-7 days a week. I don't "feel" it usually, but sometimes I do. I'll do the SS-31 and MOTS-C again soon. Those affect the mitochondria and I might not feel them working, but I'll use them since I have them.