Side effects of testosterone enanthate include symptoms of masculinization like acne , increased hair growth , voice changes , and increased sexual desire .  The drug is a synthetic androgen and anabolic steroid and hence is an agonist of the androgen receptor (AR), the biological target of androgens like testosterone and dihydrotestosterone (DHT).   It has strong androgenic effects and moderate anabolic effects, which make it useful for producing masculinization and suitable for androgen replacement therapy .  Testosterone enanthate is a testosterone ester and a long-lasting prodrug of testosterone in the body.    Because of this, it is considered to be a natural and bioidentical form of testosterone. 
Tribulus works by stimulating the anterior pituitary to produce Leutinizing Hormone. Tribulus is a first choice addition to many testosterone boosting formulas because it could keep natural levels testosterone not having any negative effects on its long term production. It is a well-documented risk to introduce exogenous hormonal substances (like steroids) that shut down the endogenous production of testosterone. As the use of these products tapers down, it is essential that the endogenous production kicks back in as soon as possible because normal levels of these hormones are needed to maintain much of the gains made while taking them., therefore tribulus becomes a valuable addition to any hormone boosting stack.
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