Good minimum dose for deca would be 300-400mg pw and the same with EQ. If its good quality gear and dosed correct then you can get away with 300mg pw of both EQ and Deca, though as many people are sus on the gear they dose it at a minimum of 400mg pw. Btw EQ works on collagen synthesis just a little bit better than Deca. These are minimum cycle doses though, if your looking at minimum doses in general then you could go as low as 200mg pw.
Good Steroids for Collagen Synthesis in order of strongest too weakest:
EQ
Deca
Primo
Var
HGH reigns supremacy in its Collagen Synthesis effects, and will beat any ASS if dosed high enough.