I don't think there is a more powerful formula than AAS+HGH+SLIN+IGF.
Metformin may have a few less sides...but it can easily kill you.
Metformin can still cause a lot of damage if not taken right, there are sides that could be fatal, usually from lactic acidosis or hypoglycemia.
When or if you want to start using these products, especially slin/metformin, you really need to do a couple months of homework on slin alone. And those who do use these compounds, usually have several years of experience with AAS.
/V