IGF can be made... real question is... does it really work? for example, igf works in delicate balance with IGFBP 3 and in tandem with other growth factors... if you just take IGF solo, how much good does it do? That's why gh is tried and tested... it starts an entire cascade, including IGF.. perhaps IGF works best taken WITH slin, gh and AS because they are synergistic but less than ideal taken alone