Estrogen related side effects

athlet with dumbbell

Steroid aromatization

Nowadays most athletes take steroids in order to get optimal results. However, the intake of AAS may lead to certain side-effects. Estrogen relatedside-effects caused by aromatization, are probably the most unpleasant ones.

Therefore, athletes are trying to find unaromatizable steroids, which is a misconception, as all steroids are aromatizable to some extent. Today we will regard the issues of aromatization and estrogen related side-effects.


One should understand that steroids do not cause aromatization. This is a naturally occuring process which converts testosterone into estrogens. The enzyme responsible for this conversion is called Aromatase. This is where the term “aromatization” comes from.

The major task of aromatization is the creation of cholesterol and fats. However, when the excessive amount of male hormone gets into the body, the organism tends to keep the balance, thus transforming it into estrogens.

In its turn, this transformation produces the excess of estrogens, which leads to gynecomastia, also known as gyno or “bitch tits”.Each organism has its own number of aromatase enzyme. The higher is this number, the more testosterone transforms into estrogens.

Therefore, athletes with high amount of aromatase enzyme has higher risks of estrogenic side effects. They should pay special attention to antiestrogens while going through steroid cycle.


Normally males produce around 7 mg of testosterone a day. However, it is not enough to cause massive muscle growth. But one can trigger this growth by taking exogenous testosterone. Since the usual dosage is around 100 mg, our body tries to get rid of the excess, by initiating aromatization.


It’s important to know, that both males and females produce estrogen. Though it is regarded as “female hormone”, it plays important role in males too. Estrogen is a natural steroid, which performs specific functions in male organism, including:

  • growth ofbones
  • development of reproductive system
  • regulation of body temperature
  • memory function
  • and even muscle growth in combination with testosterone.

Therefore, one shouldn’t regard it as “evil”. Estrogen is good when its amount is within norm, but when it is too high, it may lead to undesirable side effects.


It is estrogen that makes the shape of female body. As a sex hormone it helps females to mature for childbirth, breastfeeding, and pregnancy. Due to aromatization the intake of steroids without antiestrogens may elevate the level of estrogen in males.

This in turn causes growth of breast tissue and female type fat deposition. In other words, the excess of estrogens can reshape the male body into female one. Luckily one can easily avoid this unpleasant side effect by using antiestrogens.

Water retention

Excessive levels of estrogen may cause water retention, which means accumulation of water in the tissues of an organism. It makes your body look puffy. Thus, the lower is estrogenic property (aromatizability) of steroid you use, the less water your body keeps.

Thereby at the end of your steroid cycle, you will have more lean muscle mass and less rollback. Since antiestrogens can greatly reduce the rate of aromatization and prevent estrogenic side effects, they are very important for athletes taking steroids. Make sure that you have aromatase inhibitors and estrogen blockers in your cycle plan.

Other side effects

  • Vomiting
  • Muscle tightness
  • Dizziness
  • Weight changes
  • Weakness
  • Joint pain
  • reduction of immunity
  • cholesterol issues

Most Aromatizing Steroids

One should remember that all steroids are prone to aromatization. All of them aromatase but at different rate. Therefore, we are talking about most and less aromatizable steroids.

Also,such individual features as the number of aromatase enzyme in the organism may influence the rate of aromatization of certain steroids. This number can turn low aromatizable steroid into highly estrogenic.

Here is the list of steroids with high estrogenic activity.

Less Aromatizable Steroids


The following list of antiestrogensis recommended for use during the cycle or PCT in order to reduce estrogenic effect.

Arimidex (Anastrozole) – aromatase inhibitor (during cycle)

Femara (Letrozole) aromatase inhibitor (during cycle)

Clomid (Clomiphene Citrate) blocker of estrogen receptor (PCT)

• :tamoxifene: blocker of estrogen receptor (PCT)

HCG (Pregnyl (HCG – Human Chorionic Gonadotropin)) prevents the atrophy of testicle, during heavy cycles, which last more than 6 weeks

If youdecided to take steroids, you should be very attentive to the symptoms. Choose those substances, which are suitable for your body. Also it’s important to pay attention to your diet and sleep.

There are several reliable sources where you can buy anabolic steroids:

Leave a Reply

Your email address will not be published. Required fields are marked *