Masteron Side Effects: Hair Loss, Low Oestrogen Risk & More (2026)

Masteron (drostanolone) is often described as one of the safer anabolic steroids due to its non-aromatising nature and relatively modest lipid and liver impact compared to oral compounds. This assessment is broadly accurate, but Masteron carries real risks — particularly androgenic side effects that are more pronounced than the compound's anabolic rating suggests, and HPG axis suppression that requires proper PCT management. This guide provides an accurate clinical overview.

Side Effect Overview: What Makes Masteron Distinct

Masteron's side effect profile is shaped by three key facts:

1. It is a DHT derivative and does not aromatise — no oestrogen-mediated water retention or gynaecomastia risk from the compound itself
2. Its androgenic rating (25) understates its practical androgenic effects on hair follicles and skin
3. Its anti-oestrogenic properties can create low-oestrogen side effects if oestrogen falls too far below physiological levels

Side Effect Summary Table

Side Effect	Incidence	Severity	Reversibility
Accelerated hair loss (MPB)	High (in predisposed men)	Moderate–Severe	Hair lost does not return
Acne	Common	Mild–Moderate	Reversible with cessation
HPG axis suppression	Universal	Moderate–Severe	Reversible with PCT
Lipid profile disruption	Universal	Moderate	Largely reversible post-cycle
Low oestrogen symptoms	Uncommon (dose-dependent)	Mild–Moderate	Reversible with dose reduction
Blood pressure elevation	Common	Mild–Moderate	Reversible post-cycle
Hepatotoxicity	Low (injectable form)	Minimal	N/A at usual doses

Androgenic Side Effects: Hair Loss and Acne

This is the area where Masteron's reputation for being “mild” is most misleading. As a DHT-derived compound that does not convert to DHT via 5-alpha reductase (it is already a DHT derivative), Masteron directly activates androgen receptors in hair follicles with high potency. In men with genetic predisposition to male pattern baldness:

• Masteron is considered one of the highest-risk compounds for accelerated hair loss, comparable to Winstrol and Trenbolone
• Finasteride is ineffective — it blocks the conversion of testosterone to DHT, but Masteron does not undergo this conversion. It exerts its androgenic effect on follicles directly.
• Hair lost to androgenic alopecia does not regrow with compound cessation

Men with a family history of male pattern baldness who wish to preserve their hairline should avoid Masteron entirely, or use it for very short cycles (4–6 weeks) with awareness of the risk.

Acne from Masteron is common but typically manageable with good skin hygiene, topical preparations, and dose control. It resolves fully after cessation.

HPG Axis Suppression

Masteron suppresses LH and FSH production, shutting down endogenous testosterone synthesis. Because Masteron itself does not convert to oestradiol, the oestrogen feedback loop is also disrupted — this can actually deepen HPG suppression in some users. Recovery post-cycle is typically prompt with proper PCT. See our complete PCT guide.

Low Oestrogen Symptoms: The Under-Discussed Risk

When Masteron is combined with an aggressive AI protocol, oestradiol can fall too low. Men require physiological oestrogen levels (approximately 20–40 pg/mL) for bone health, joint lubrication, cardiovascular protection, and mood stability. Signs of low oestrogen include:

• Joint pain and dryness (particularly knees and elbows)
• Mood disturbance: depression, irritability, emotional flatness
• Reduced libido despite high androgen levels
• Fatigue

Management: Reduce or eliminate AI use when running Masteron. Masteron's own anti-oestrogenic activity is often sufficient for oestrogen management at testosterone doses below 400–500 mg/week. Monitor oestradiol via bloodwork and dose AI conservatively. See our bloodwork monitoring guide.

Cardiovascular Effects

Masteron produces moderate HDL suppression and LDL elevation, consistent with other injectable anabolic steroids. The magnitude of these changes is generally less severe than oral C-17aa steroids. When stacked with Winstrol (a common competition prep combination), the combined lipid impact is more pronounced — both compounds reduce HDL significantly. See our Winstrol side effects guide for comparison.

Virilisation in Women

Women should not use Masteron. Its DHT-derived profile and long action make virilisation risk very high. Female athletes seeking anabolic support should consider Anavar at low doses — see our Anavar complete guide.

Frequently Asked Questions

Is Masteron safe for the liver?

Injectable Masteron (both propionate and enanthate forms) does not undergo first-pass hepatic metabolism and is not C-17aa alkylated. It does not produce significant LFT elevation. This is one of its genuine advantages over oral anabolic steroids like Winstrol or Anadrol. See our oral steroids liver protection guide for comparison of hepatic risks across compounds.

Does Masteron cause water retention?

No — this is one of its defining characteristics. Masteron does not aromatise and has anti-oestrogenic properties. Water retention from Masteron itself is essentially zero. Water retention in a cycle containing Masteron is attributable to the testosterone base or other stacked compounds, not Masteron.

Will Masteron affect my mood?

DHT-derived compounds often have a positive effect on mood and libido — Masteron is no exception. Many users report improved mood, confidence, and sex drive. The risk of negative mood effects increases if oestrogen falls too low due to over-aggressive AI use combined with Masteron's inherent anti-oestrogenic activity.