It should be noted that in theory if one was to consistently suppress your natural estrogen levels for a long period of time, this would negatively impact your health, including your cholesterol. Due to the ability of Letrozole- to inhibit estrogen so much, this should definitely be a concern to most users. However the research that has focused on the relationship between use of letrozole and cholesterol levels is rather inconsistent in it's findings. Many studies have concluded that the compound is detrimental to both a user's HDL and LDL cholesterol levels, while other research has found no link. Obviously individuals are best served to monitor their cholesterol while using any compound via blood tests however barring that, letrozole should simply not be run for extended periods of time if at all possible. Doing so could cause serious medical complications.
Along with the issues related to blood lipids is the fact that many users complain that their libido is dramatically reduced when using the compound. This is related to the fact that estrogen is partly responsible for the regulation of an individual's sex drive. Since Letrozole- is so potent it can often drive estrogen levels too low and this inhibits a user's libido. To avoid this users can lower dosages, but some anecdotally report that even extremely low doses of the drug can cause problems. If this is the case a less potent compound such as exemestane or anastrozole may be a more appropriate option.
As with all anabolic steroids Oxandrolone will suppress natural testosterone production in men. Testosterone suppression does vary from steroid to steroid in terms of the rate and Oxandrolone is one of the milder forms. However, most all men will still need some form of exogenous testosterone if they are using Oxandrolone at any significant dose for any significant time. Those who do not supplement with testosterone have an excellent chance of putting themselves into a low testosterone condition. For the purpose of information a performance level dosing of Oxandrolone will suppress natural testosterone production in most men by dropping serum testosterone levels by 50%. This will put most men into a low level state and if not certainly in a below optimal state.
Once the use of Oxandrolone is done and it along with all anabolic steroids has cleared the body natural testosterone production will begin again. It’s important to note that recovering prior natural levels assumes no prior low level condition existed and that there was no damage done to the HPTA during steroid use . Most men will need a Post Cycle Therapy (PCT) plan to aid in recovery, but they should also note that PCT will not promote full recovery. It takes several months to recover from anabolic steroid use and there’s no guarantee that you always will even with the best PCT plan in the world.