also since you've been running hgh this long your natural production might have been downregulated significantly, if that's the case, if you quit the hgh and run just igf for pct, it probably won't work as good, alot of people ssay igf quits working after 25-50 days, they don't know why but they think it's because it shuts down natural hgh production, If you keep running your hgh 4 weeks after your last shot and run it with igf you don't run the risk of the igf not working, just a theory, i am not a scientist by any means