Total testosterone goes down by about 1-2% per year , starting sometime in your 30s, and bioavailable testosterone decreases by about 2-3% a year. Those numbers can be pretty misleading though. Men approaching middle age tend to exercise a lot less, and eat a lot worse. So nobody really knows what a “natural” decline in testosterone looks like, on a population-wide basis. It’s kind of like saying muscle mass decreases 1-2% a year once you hit middle age … that decrease can have a lot to do with more time spent on work and family, and less time spent trying to get ripped to attract a partner (among other reasons, of course).
Yes, 10 mg daily. At that level you will see results but nothing like AAS. 5 mg or less and I doubt you’ll experience any real increase in strength or size. Also, it takes a few days to a week or so to really feel them (. strong pumps, and certainly calf cramps during HIIT). You can take safely for 12 weeks, but the my returns diminish around week 8, so I’d suggest 2 months (or 2 bottles). Stacks well with 30 mg Rad 140 daily, split dosed. No AI needed, but anti-e (. clomid/novaldex) for pct at those dosages. Equal time off after cycle is probably overkill, but seems like a safe protocol.