I have no idea if osta does, ive seen 20 and 21 year olds run sarms on here. Its not the hgh that stunts your growth, its the closure of your growth plates that causes it along with messing with your endocrine system while its in development. There really isn't an effect on your hgh level with AAS. If your E2 (estrogen) gets too high I'm sure it could cause them to pre-maturely close.