Physical Effects
Cardiovascular
The most serious long-term risk. Steroids thicken heart walls (LVH), accelerate artery plaque buildup, raise blood pressure, and thicken blood, all silently. Young men are having heart attacks in their 30s from steroid use.
Get an echocardiogram, monitor blood pressure at home, and check your lipid panel and haematocrit on blood work.
Liver Strain
Oral steroids (C17-alpha alkylated) stress the liver significantly. Elevated enzymes, impaired bile flow (cholestasis), and in rare cases tumours can result, particularly with long or high-dose oral cycles.
Keep oral cycles to 6–8 weeks max. Avoid combining with alcohol. Get liver function tests on blood work. Stop and see a doctor if you notice jaundice or dark urine.
Hormonal Disruption & Fertility
Every cycle shuts down your natural testosterone production. Sperm production drops, and many users become effectively infertile on cycle. After prolonged use, recovery may be partial or impossible.
Always have PCT medications ready. Consider sperm banking if fertility matters to you. Get blood work to confirm recovery after each cycle.
Gynecomastia
Breast tissue development from elevated oestrogen. Early signs are nipple sensitivity and small lumps. Once the tissue solidifies, only surgery can remove it.
Have an aromatase inhibitor on hand. Monitor nipple sensitivity. Early intervention is key, but don't crash your oestrogen with excessive AI use.
Hair Loss & Acne
Steroids accelerate genetic hair loss through increased DHT activity, sometimes dramatically and irreversibly. Hormonal fluctuations also cause severe acne, often on the back and shoulders, which can scar.
Research the androgenic rating of compounds before using. If acne is severe, see your GP. Both often worsen when coming off cycle.
Risks Under 25
Under 25, steroids can permanently stunt height by fusing growth plates, disrupt ongoing brain development (impulse control, emotional regulation), and cause lasting hormonal damage to a system that hasn't fully matured.
Waiting until at least 25 is the most common harm reduction recommendation, and it exists for a reason. You're also at peak natural testosterone. Get blood work to see your baseline.