They are very good, for the bodybuilder i think the only (research) peptides available can help:

IGF1RL3
IGF2LR3
GHRH and GHRP(Combo) - like GHRP2,GHRP6,Ipamorelin,Hexarelin - CJC with DAC, CJC without DAC (Mod GRF)

And the another peptides that can help the bodybuilder:

GH (duhh)
Insulin
IGF-1 and IGFBP3 (Increlex or Iplex)