Injection of testosterone may be safer and more effective than transdermal administration for combating loss of muscle and bone in older men.
Borst SE, Yarrow JF. Injection of testosterone may be safer and more effective than transdermal administration for combating loss of muscle and bone in older men. Am J Physiol Endocrinol Metab. 2015 Jun 15; 308(12):E1035-42.