stacks

At almost 54 years old, I am testing low on testosterone, 265, so before I do biweekly injections I wanted to know if there was an alternative to those that will generate positive results in my fitness routine with minimal side effects. Any info would be helpful.

I'm thinking about starting to stack s4 ,MK 677 and,gw-501516. Is this a good idea?what should I watch for? My diet is on point. My goal is to get leaner and put on a bit more muscle. Any advice for me?