Testosterone is a hormone naturally produced by the human body and is considered the safest steroid compared to other anabolic steroid variants.
The reason for this is that research on testosterone is extensive, and the human body is already familiar with this hormone.
Clinical studies on testosterone and its various esters far exceed those of any other existing steroids, and information about their associated side effects is well-established.
In contrast, other medications derived from modifying testosterone can cause unexpected side effects, and research on them is relatively lacking.
While testosterone propionate does have side effects, its thorough understanding allows for effective management, making it more stable than other steroids due to its predictable side effect profile.
Estrogen Side Effects
Testosterone has a moderate level of estrogenic activity, meaning aromatization occurs during use, converting testosterone into estrogen.
Particularly when using the high doses required in bodybuilding, this process can cause a significant increase in estrogen levels.
The rate of aromatization is proportional to the dosage; as the dose increases, the conversion rate of testosterone to estrogen also rises.
Consequently, methods include using aromatase inhibitors to block the aromatase enzyme and inhibit estrogen conversion, or using the SERM Nolvadex to prevent gynecomastia.
However, since SERMs do not actually lower serum estrogen levels, they must be used in conjunction with aromatase inhibitors to be effective.
Estrogen side effects include water retention, bloating, increased blood pressure, fat gain, and gynecomastia.
Androgenic Side Effects
Testosterone is a primary male hormone, and the side effects of testosterone propionate include aspects related to androgenic activity.
Testosterone is converted into the more potent androgen dihydrotestosterone (DHT) via the 5-alpha reductase (5AR) enzyme.
DHT exists in high concentrations in the scalp, prostate, and skin; testosterone reaching these tissues is rapidly converted into DHT, exerting strong androgenic effects.
DHT can cause androgenic side effects such as male pattern baldness, increased sebum production, and acne.
Using 5AR inhibitors like Proscar or Dutasteride can block DHT production, but since the androgenic potency of testosterone itself remains, completely eliminating side effects is difficult.
Using topical DHT blockers like Nizoral 2% shampoo can help block DHT in the skin and scalp, reducing the risk of male pattern baldness and alleviating acne.
Androgenic side effects include oily skin, acne, body and facial hair growth, benign prostatic hyperplasia (BPH), and the potential to trigger male pattern baldness (MPB) in those with a genetic predisposition.
HPTA and Endogenous Testosterone Production Side Effects
All anabolic steroids can cause suppression or shutdown of endogenous testosterone production, and testosterone propionate is no exception.
Long cycles can lead to a complete shutdown of the endocrine system, making Post Cycle Therapy (PCT) essential in such cases.
PCT utilizes ancillary medications like Nolvadex or HCG to rapidly normalize the HPTA and endogenous testosterone production.
PCT is typically conducted for 4-6 weeks after the cycle ends. Failure to implement it can lead to hypogonadism, potentially requiring lifelong Testosterone Replacement Therapy (TRT).
Hepatotoxicity Side Effects
Testosterone propionate is not a C17-alpha alkylated anabolic steroid and therefore does not cause hepatotoxicity.
Studies have shown no signs of hepatotoxicity even with high oral doses of testosterone, because when testosterone is administered via injection, the ‘first pass’ liver effect does not occur.
While orally administered substances pass rapidly through the liver, injectable administration avoids this issue, resulting in minimal impact on the liver.
Therefore, there is no need to worry about hepatotoxicity with testosterone propionate.
Cardiovascular Side Effects
Testosterone propionate, like other anabolic steroids, can negatively impact the cardiovascular system and cause adverse cholesterol changes.
Primarily, it can cause a decrease in HDL (good cholesterol) and an increase in LDL (bad cholesterol), which elevates the risk of atherosclerosis.
The extent of these negative changes depends on the dosage and duration of use.
Testosterone itself has a lesser impact on cholesterol levels compared to other steroids; however, oral steroids can have a greater effect due to how they are metabolized in the liver.
Clinical studies indicate that the impact of testosterone enanthate on HDL is relatively mild, but the use of aromatase inhibitors can cause a further decrease in HDL.
For example, one experiment injecting 300mg of testosterone resulted in a 13% decrease in HDL, and increasing the dose to 600mg led to a 21% decrease.
Research suggests that increased estrogen levels can have a positive effect on cholesterol.
Therefore, when using aromatase inhibitors, it is advisable to maintain estrogen levels at a minimum to prevent extreme fluctuations in cholesterol levels.
