Meth first. But if you can tolerate the lifestyle and have the money, trenbolone and genuine pharma HGH will turn you into a god.
But no drug works without potentially severe side effects.
The only healthy thing that works is diet and cardio. If you live in a city, just bicycle everywhere. I had some sober years back in the day, and used to commute from Brooklyn to Midtown Manhattan on my bike 3-4 days a week. I was in the best shape of my life then. I only stopped that routine as I started to hit the gym again more, got back into boxing, and it was impossible to build muscle.