Testosterone is an endogenous steroid, naturally produced in most animals.
This makes it a potentially safe choice even for beginners, as the body is already familiar with the effects of testosterone.
Numerous clinical studies have covered the effects and side effects of testosterone, which are now well-documented and easily accessible.
Although side effects can occur, a thorough understanding of the side effects of testosterone suspension allows for proper prevention and management.
Estrogenic Side Effects
Testosterone suspension is aromatizable and can be readily converted into estrogen within the body.
This process is mediated by the aromatase enzyme, and due to the fast-acting nature of the suspension, estrogen-related side effects can be more pronounced compared to other forms.
Side effects are dose-dependent; higher doses increase aromatization, thereby raising the probability of side effects.
Drugs like SERMs (e.g., Tamoxifen) can be used to prevent gynecomastia, but they are only effective in specific tissues.
An Aromatase Inhibitor (AI) is required to lower total estrogen levels.
AIs inhibit the aromatase enzyme, blocking estrogen production, which can help prevent water retention, bloating, and gynecomastia.
SERMs are only effective for preventing gynecomastia and do not affect bloating or water retention.
Primary estrogenic side effects include water retention, bloating, elevated blood pressure, increased fat storage, and gynecomastia.
Androgenic Side Effects
Due to the effects of the male hormone testosterone, testosterone suspension can cause androgenic side effects.
The risk is particularly increased at bodybuilding doses, and most male hormone side effects stem from a metabolite of testosterone called Dihydrotestosterone (DHT).
When testosterone reaches the scalp or skin, it is converted to DHT by the 5-alpha reductase (5AR) enzyme.
DHT is a hormone five times more potent than testosterone and can cause male pattern baldness, acne, and oily skin.
To reduce these side effects, a 5AR inhibitor (e.g., Finasteride) can be used; this medication inhibits the production of DHT.
However, since testosterone itself exhibits androgenic properties, using a 5AR inhibitor cannot completely block all side effects.
Some individuals may use topical DHT blockers like Nizoral shampoo to mitigate scalp hair loss or acne.
Primary androgenic side effects include increased sebum production (oily skin), acne, body hair growth, risk of Benign Prostatic Hyperplasia (BPH), and triggering Male Pattern Baldness (MPB).
HPTA and Endogenous Testosterone Production Side Effects
All anabolic steroids, including testosterone suspension, will suppress or shut down the body’s natural testosterone production when used at supraphysiological doses.
This is known as HPTA suppression/shutdown, a possible side effect of all anabolic steroids.
After cycle discontinuation, the user must typically initiate PCT (Post Cycle Therapy) for 4-6 weeks, which involves drugs that help restore HPTA function and stimulate testosterone production.
Failure to implement PCT can result in permanent hypogonadism, potentially necessitating TRT (Testosterone Replacement Therapy).
Hepatotoxicity Side Effects
Testosterone does not contain C17-alpha alkylation (C17AA), so it does not negatively impact the liver.
Clinical studies have confirmed an absence of liver toxicity from testosterone use.
One study involved very high doses of oral testosterone for 20 days, yet no changes in liver enzyme levels were observed.
Since testosterone suspension is administered via injection, its impact on the liver is even less, and there is no concern regarding hepatotoxicity.
Cardiovascular Side Effects
All anabolic steroids, including testosterone suspension, can cause cardiovascular side effects at high doses, particularly having a negative impact on cholesterol levels.
Oral anabolic steroids tend to have a greater impact than injectables, characterized by a decrease in HDL and an increase in LDL.
This increases the risk of atherosclerosis, and the degree of change is dose-dependent.
Testosterone has a lesser impact on cholesterol compared to other steroids and is easily metabolized by the liver, resulting in fewer side effects.
Research indicates that testosterone enanthate has a mildly negative impact on HDL, and adding an aromatase inhibitor can worsen this effect.
Some studies suggest that estrogen has a positive effect on cholesterol levels, making it preferable to use aromatase inhibitors at the minimum effective dose.
