What's a desirable range for IGF-1 levels while on hgh? I got blood work done and mine was at 415 ng/ml. I'm on 3ius of hgh daily. I'm also 28 so my natural levels should still be moderately high. I'm trying to decide whether to bump up my dosage to 4 or 5 ius of hgh daily. I'm solely using it for injury recovery. But would not mind some muscle growth as well.