Research has indicated that stigmasterol may be useful in prevention of certain cancers , including ovarian , prostate , breast , and colon cancers . Studies have also indicated that a diet high in phytoesterols may inhibit the absorption of cholesterol and lower serum cholesterol levels by competing for intestinal absorption. Studies with laboratory animals fed stigmasterol found that both cholesterol and sitosterol absorption decreased 23% and 30%, respectively, over a 6-week period. It also possesses potent antioxidant , hypoglycemic and thyroid inhibiting properties. 
Boldenone undecylenate is an extremely versatile drug and, as such, combines very well with other steroids. An example of a great mass building stack would be 300-400mg/week of Boldenone undecylenate with 500mg of Sustanon or Testosterone Enthanate. For mass building purposes it can also be effectively stacked with Anadrol. This would result in significant gains in strength and mass without the additional side effects that would result from using the androgen alone. In terms of its use as part of a cutting cycle, Boldenone undecylenate combines very well with non-aromatizable steroids such as Trenbolone acetate or Winstrol. However, even the extremely low aromatization rate of these substances may be enough to cosine usage to bulking cycles only.
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.