How Important Is IGF-1 for Muscles?

hi guy,

i have low igf-1 and i just started my third cycle, and im wondering if i should add hgh 1-2iu or low dose igf-1 to build muscle or is it not really that important in term of recovery and gains.

i read somewhere that deca increase igf-1 but i have deficiency so there might be an issue with pituitary gland so would deca increase my igf-1 or would i need hrt just for this cycle.