Masteron in particular may possibly exhibit even worse effects on the negative cholesterol changes it imparts on the human body. This is due to Masteron’s aromatase inhibiting and anti-estrogenic properties, as the reduction of Estrogen levels below normal physiological levels has been demonstrated in studies to impart an even worse impact on cholesterol profiles than when anabolic steroids are administered alone without an aromatase inhibitor. Testosterone in particular has demonstrated in one clinical study to have only a mild impact on HDL cholesterol after a 12 week period where 280mg of Testosterone Enanthate was administered weekly. The cholesterol profiles had later changed for the worse when an aromatase inhibitor was included, which resulted in a significant 25% drop in HDL cholesterol  . This must be remembered by any potential user of Masteron, and Estrogen levels must be closely monitored so as to ensure Masteron does not reduce Estrogen to the point whereby cholesterol profiles are impacted negatively.
According to the aggregate data from a number of scientific studies, despite its conservative nature, Primobolan was proven to provide significant increases in muscle development in a reasonable amount of time. Another interesting fact that was discovered during the testing of this compound was the fact that it effectively bound itself to the AR. In fact, Primobolan was able to bind itself to the AR more effectively than naturally produced testosterone. This is huge because the ability to effectively bind to the AR allows Primobolan to be one of the most effective fat-burning compounds available. Positive AR binding has been directly correlated with lipolysis.