When u get yourself some GH please go get a GH serum test done to check your purchase to be sure you did indeed receive HGH and not something masquerading as HGH. The reason I say that is nothing is going to raise your GH level a significant amount but more GH. Yes there are ways to boost your GH serum number, but not from say 3 to over 20 other than more GH. On the other hand IGF numbers can be elevated for any number of reasons including peptides, tren, Pramipexole, and even Aromasin can cause a spike in IGF levels. That doesn't include any number of medical issues you might have that you're not even aware of like stressed kidney's that will cause your pituitary gland to kick into overdrive and start producing a shit ton of IGF. So yes IGF levels do matter but if you're smart when you get your kit of GH you'll order a serum test which only cost around 40 bucks, and then inject 10iu's IM 3 hours before having blood drawn on while fasting. Then go have your test and see where ur numbers land. If it's really good GH your number should be anywhere from 20 to as high as 40's. Never seen a number higher than that on 10iu's but I'm not saying it's not possible. Then after you confirm you have yourself legit GH you can worry about where your IGF is at after you've been on for awhile. Or you can simply ignore everything I just said and inject your stash hoping it's legit GH and not simply a peptide that's causing your IGF to spike without giving you the other benefits that GH offers...Good luck