I think someone is pulling your leg bro
Trust me, there is no 600mg/ml in 2ml vials Deca from Greece with yellowtops.
Im am from Greece and I never heard or seen anything like that.
Besides that I dont think its possible and no pharmaceutical company would produce such a high concentration deca. It wouldnt be practical.
Canuck4
I am 99.9% confident that there are no 600mg/ml Yellow tops. For that strength it would be an underground lab (although not heard of one doing such a product) and would probably come in 10ml vials.