Edited sentence: It is not of concern to somebody that has already stopped growing.There have been studies done on Male and Female mice showing Tamoxifen acting as an Estrogen Agonist on bone metabolism and skeletal growth.Thus increasing the possibility of pre-mature bone fusion.While Tamoxifen has been shown to control the amount of Estrogen in tissue's such as the breast, It's effects in other places such as bones has not been documented fully