Cardiovascular Disease
Anabolic/androgenic steroids have an effect on the level of LDL, HDL, and total cholesterol values.
What is cholesterol? Cholesterol is a substance in the human body that is required for building and regulating cells. There are two types of cholesterol LDL (low density lipoprotein) which is know as the bad cholesterol and HDL (high density lipoprotein) which is known as the good cholesterol.

What is a lipoprotein? A lipoprotein is a biochemical assembly made up of lipids, which are fats, and protein molecules. Lipoproteins are vital to the body functions because they serve to transport different forms of cholesterol to areas in the body where they are needed.
LDL (Low Density Lipoprotein): Causes buildup of cholesterol in the artery walls, forming plaque and eventual blockages that can lead to heart attack or stroke.
HDL (High Density Lipoprotein): Removes cholesterol deposits from the arteries. Carries cholesterol through the system to the liver, where it can be properly metabolized. HDL seems to protect the cardiovascular system from disease.
From the use of steroids the general pattern seen is that they can decrease the level of HDL cholesterol numbers while simultaneously increasing the level of LDL cholesterol numbers. What is important is the ratio of the HDL and LDL cholesterol numbers not one’s total cholesterol count. Unfavorable changes to the ratio in the long term can be very detrimental to the cardiovascular system which can lead to high blood pressure and disease.
It should be noted that most oral steroids with 17alpha alkaylated structure have a much stronger negative effect on the HDL cholesterol numbers than injectable steroids.
A study was carried out comparing the effect of a weekly injection of 200mg testosterone enanthate and a 6mg daily oral dose of Winstrol®. After only six weeks, stanozolol was shown to reduce HDL and HDL-2 (good) cholesterol by an average or 33% and 71% respectively. While the HDL reduction (HDL-3 subfraction) with the testosterone group was only an average of 9%. Stanozolol LDL (bad) cholesterol rose by 29%, while with the use of testosterone is actually dropped by 16%.
It should be noted that estrogen also has an impact on cholesterol profiles, for example, estrogen replacement therapy in postmenopausal woman is commonly linked to a rise in HDL cholesterol and a reduction in LDL values.Likewise the aromatization of testosterone to estradiol may be beneficial in preventing a more dramatic change in serum cholesterol due to the presence of the hormone.
A recent study was conducted comparing the effects of testosterone alone (280mg testosterone enanthate weekly), vs the same dose combined with an aromatase inhibitor (250mg testolactone 4 times daily). Methyltestosterone was also tested in a third group, at a dose of 20mg daily. The group using only testosterone enanthate showed no significant decrease in HDL cholesterol values over the course of the 12-week study. After only four weeks, the group using testosterone plus an aromatase inhibitor displayed a reduction on average of 25%. The methyltestosterone group noted an HDL reduction of 35% by this point, and also noted an unfavorable rise in LDL cholesterol.
So from the results of the study we should think a little more carefully about the estrogen maintenance through a steroid cycle. For instance Nolvadex® doesn’t exhibit anti-estrogenic effects on cholesterol values, it can actually raise HDL values. So using Nolvadex® instead of using a aromatase inhibitor like Arimidex®, may be the better choice, especially for those who will use steroids for longer periods of use.