Boldenone
Boldenone undecylenate, Equipoise, EQ, Boldenone cypionate, Ganabol, Boldenone acetate, Quinbolone, Anabolicum Vister
Forms: Mainly the long-acting undecylenate ester (veterinary Equipoise); other esters come only from underground labs.
Injectable steroidsControlled substanceWADA S1.1 · prohibitedEvidence: animal data only
A veterinary steroid (Equipoise) that differs from testosterone by one extra double bond. It converts to estrogen less than testosterone and, as a long ester, acts slowly.
Legal status: Controlled anabolic steroid (US Schedule III, UK Class C); licensed only for veterinary use where approved; status varies by country.
What it gives
What people use it for and what the sources report. Strength is a general category from the literature: mild, clear or strong.
Purpose
Used for gradual lean gains and a bigger appetite, usually alongside testosterone. Approved only for veterinary use, mainly in horses; human products were withdrawn decades ago.
What people seek and what studies show
No human trials exist. In growing rabbits it increased weight gain, feed efficiency and eating, while lowering the animals' testosterone and raising their estradiol. Its effects in people are described only by users and in case reports, so how strong they are, and how it compares with testosterone, is unknown.
Effects
Evidence: Animal data only — effects in people are unproven
Sought effects by goal (as reported)
Mass
Sought for: muscle growth, strength, higher appetite
Recomposition
Sought for: muscle growth
Strength
Sought for: strength, muscle growth
Possible side effects
Possible does not mean certain: whether they appear depends on dose, duration, individual response and monitoring. Below — what to watch for and how to notice it early.
13 possible side effects
level · how often it is reportedElevated
Suppression of natural testosterone & fertility
commonSuppresses natural testosterone and sperm production like other AAS; its very long-acting ester delays the start of recovery after stopping.
How to notice: Lower libido and energy, smaller testicles; low natural testosterone on tests after stopping.
In women: Menstrual changes or missed periods, lower libido and energy; reduced fertility.
Elevated
Black-market quality risk (fakes, contamination)
commonNo human-grade product exists: supply is veterinary or underground, with risks of wrong content and non-sterile oil.
How to notice: Unexpected effects, pain or infection, a stronger or weaker effect than expected.
Moderate
Worse cholesterol (HDL↓ LDL↑)
commonLowers HDL like other injectable AAS; the change is silent and needs a lipid panel.
How to notice: No symptoms — only visible on a lipid panel.
Moderate
Thick blood (hematocrit) / clot risk
possibleWidely believed to raise red cells strongly, but no human data compare it with testosterone; any AAS can raise hematocrit, so a blood count is needed.
How to notice: Often silent; sometimes headaches, flushed face, itch after a hot shower.
Moderate
Higher blood pressure
possibleCan raise blood pressure, especially combined with testosterone; home readings show the trend.
How to notice: Often silent; sometimes headaches, flushing, nosebleeds — a home monitor shows it.
Moderate
Heart strain / heart-muscle thickening
possibleData are limited to case reports, including severe heart failure after testosterone plus boldenone; it adds to the class link between years of AAS use and heart-muscle changes.
How to notice: Shortness of breath on effort, lower endurance, palpitations.
Moderate
Kidney strain
rareBoldenone can raise creatinine without real kidney disease, yet true AAS kidney damage also occurs; cystatin C and a urine test help tell them apart.
How to notice: Usually silent; foamy urine or swelling in later stages.
MenLow
WomenHigh
Virilization in women (often irreversible)
commonIn women it causes voice deepening, facial hair and clitoral enlargement, which may be permanent.
How to notice: Hoarse or deeper voice, new facial or body hair, menstrual changes, clitoral enlargement.
Low
High estrogen (water, gyno risk)
possibleConverts to estrogen less than testosterone; estrogenic effects such as water retention are usually milder but possible.
How to notice: Puffiness, sensitive or itchy nipples, mood swings, water weight.
Low
Anxiety, insomnia, night sweats
possibleSome users report anxiety and restlessness; the evidence is anecdotal.
How to notice: Trouble falling asleep, night sweats, restlessness.
Low
Acne, oily skin
possibleAcne and oily skin are possible, as with other androgens.
How to notice: Oily skin, spots on back, shoulders and face.
Low
Androgenic hair loss
possibleOnly weakly converted to a DHT-like androgen; hair loss is possible in those genetically prone.
How to notice: More hair in the shower, thinning at the temples or crown.
Low
Injection pain, infection, oil cough
possibleSoreness is possible; redness, heat or fever suggest infection and need a doctor.
How to notice: Soreness, lumps; a short coughing fit right after an injection.
What the levels mean
Lowbackground — just be aware
Moderatewatch for signs
Elevatedneeds regular control
Highcritical — can be life-threatening or permanent
Level: general category from the literature, not your personal risk
How often
- common
- reported often
- possible
- reported in some people
- rare
- reported occasionally
How to lower the risks
For 11 of 13 possible side effects there are specific ways to lower the chance: everyday measures, supplements and options a doctor may consider. For the rest — general advice. No measure removes a risk completely. Prescription medicines are listed only for a doctor to decide on, after tests — they have side effects of their own.
ElevatedSuppression of natural testosterone & fertility
Check hormones before and after; if they stay low, see an endocrinologist.
Measure
Only if a doctor prescribes
How each option helps (7)
- Regular blood tests — LH, FSH and testosterone show how deep suppression is and whether natural production has recovered afterwards.
- Working with a doctor — Assesses how deep suppression is and guides recovery afterwards, including fertility testing.
- Clomiphene — A doctor may consider it after stopping, guided by hormone tests; recovery after long use can still take months. Risks: vision changes, mood swings, rare clots. Has side effects of its own.
- Human chorionic gonadotropin (hCG) — A doctor may consider it to preserve fertility (in men it keeps the testes working); it does not restart the pituitary, so natural LH still has to recover. Risks: higher estradiol, gynecomastia. Has side effects of its own.
- Tamoxifen — A doctor may consider it after steroids are stopped, guided by hormone tests; it has not been tested for this after steroid use. Risks: blood clots, vision changes. Has side effects of its own. Not offered to women: in the women’s view it adds to a risk this substance already carries.
- Follicle-stimulating hormone (follitropins, menotropins) — A fertility doctor may consider adding it to hCG when semen tests and FSH stay low; it does not restart the pituitary. Risks: gynecomastia, acne. Has side effects of its own.
- Toremifene — A doctor may consider it after steroids are stopped, guided by hormone tests; it raised testosterone in subfertile men but was never tested after steroids. Risks: QT prolongation, clots. Has side effects of its own. Not offered to women: in the women’s view it adds to a risk this substance already carries.
ElevatedBlack-market quality risk (fakes, contamination)
Products obtained without a prescription are often fake, mislabeled or non-sterile, and there is no way to check at home. For legal supplements, look for third-party testing (Informed Sport, NSF).
ModerateWorse cholesterol (HDL↓ LDL↑)
Avoid combining several oral steroids; regular cardio, soluble fiber (psyllium), less saturated fat and alcohol; if LDL/ApoB stay high, a doctor may consider a statin. Omega-3 only lowers triglycerides.
Measure
Supplement or OTC product
How each option helps (8)
- Regular blood tests — A lipid panel with ApoB shows how far HDL has dropped and LDL risen — changes you cannot feel.
- Working with a doctor — Interprets lipids and ApoB and decides whether a statin or other therapy is warranted.
- Avoiding alcohol and other liver stressors — Alcohol raises triglycerides; its small HDL bump does not lower heart risk.
- Regular cardio training — Raises HDL a little and lowers triglycerides; it cannot offset a steroid-driven fall in HDL on its own.
- Berberine — Placebo-controlled meta-analysis: LDL about 0.5 and triglycerides about 0.4 mmol/L lower; HDL unchanged. Trials are mostly small; no statin substitute.
- Citrus bergamot — Pooled small trials show lower LDL and triglycerides, but certainty is low to very low; it is no replacement for statins.
- Omega-3 (fish oil, EPA/DHA) — Clearly lowers triglycerides but does not fix the steroid HDL drop, the main lipid harm; DHA-containing oils may even raise LDL slightly.
- Psyllium husk fiber — Lowers LDL by about 0.2–0.3 mmol/L (roughly 5–10%), also on top of doctor-prescribed statins; no effect on HDL.
ModerateThick blood (hematocrit) / clot risk
Check the blood count regularly; if hematocrit stays high, a doctor decides — usually stopping or reducing the cause, sometimes therapeutic phlebotomy, never blood-bank donation. Avoid dehydration: it thickens the blood further.
Measure
How each option helps (3)
- Regular blood tests — A blood count shows hematocrit and hemoglobin climbing toward the range where clot and stroke risk rises.
- Therapeutic phlebotomy prescribed by a doctor — Only on a doctor's decision, never at a blood bank. Lowers hematocrit quickly but temporarily; repeated sessions drain iron, and a lower clot risk is unproven.
- Working with a doctor — Manages thick blood by changing what you use or, if justified, by therapeutic phlebotomy.
ModerateHigher blood pressure
Less salt, regular cardio, good sleep; home readings; a doctor if it stays high.
Measure
Supplement or OTC product
How each option helps (8)
- Home blood-pressure monitoring — Seated, rested readings on several days show your true BP; persistently high values are a signal to see a doctor.
- Regular cardio training — Regular aerobic training lowers resting BP by a few mmHg, more in people with high BP.
- Working with a doctor — Diagnoses persistent hypertension and prescribes treatment when needed.
- Avoiding alcohol and other liver stressors — Regular drinking raises blood pressure; cutting it out lowers it.
- Coenzyme Q10 — Inconsistent: some analyses show a small systolic drop in cardiometabolic disease, but a Cochrane review found no clinically meaningful effect.
- Magnesium — Meta-analysis of trials: about 2 mmHg lower systolic pressure on average.
- Omega-3 (fish oil, EPA/DHA) — Small drop of a few mmHg, mainly in people with untreated high blood pressure.
- Taurine — Meta-analysis of 20 small trials: about 4 mmHg lower systolic pressure on average.
ModerateHeart strain / heart-muscle thickening
Regular cardio, blood pressure control, an echo as a baseline and then yearly.
Measure
How each option helps (4)
- Heart screening: ECG and echocardiogram — Echocardiography shows wall thickening and reduced pumping early, while stopping AAS and treating BP can still help.
- Working with a doctor — Orders ECG and echocardiography and treats early heart changes.
- Home blood-pressure monitoring — Keeping BP controlled is one of the main ways to limit heart-wall thickening.
- Regular cardio training — Supports heart and vessel function, but does not reverse steroid-related heart thickening or weakening.
ModerateKidney strain
Drink enough water, control blood pressure, avoid regular painkillers (NSAIDs).
Measure
How each option helps (3)
- Fluid & electrolyte management — Good hydration eases kidney stress from heavy training and heat; dehydration plus NSAIDs is a classic cause of acute kidney injury.
- Regular blood tests — Creatinine reads high in muscular people and with creatine; cystatin C and a urine test give a truer picture of the kidneys.
- Working with a doctor — Investigates protein in the urine or falling kidney function and can start treatment that slows kidney damage.
MenLow
WomenHigh
Stop at the first voice change and see a doctor — early stopping matters.
Measure
How each option helps (1)
- Working with a doctor — Steroid labels say to stop at the first mild signs (hoarse voice, facial hair, clitoral growth) to prevent permanent change; checks catch them early but do not make use safe.
Low-level side effects
High estrogen
Check estradiol by blood test before acting on symptoms; keep salt and body fat in check.
Measure
How each option helps (2)
- Regular blood tests — A sensitive estradiol test shows whether water retention or nipple tenderness really comes from high estrogen.
- Working with a doctor — Prescription estrogen control is safer when adjusted by lab results than by guesswork.
Sleep & anxiety
Sleep routine, no stimulants late in the day, magnesium or melatonin.
Measure
Supplement or OTC product
How each option helps (5)
- Sleep hygiene — A steady routine and no late caffeine ease stimulant- and steroid-related insomnia; night sweats on trenbolone persist regardless.
- Glycine — Small trials show slightly better sleep quality and less next-day fatigue; not a sedative and not for anxiety.
- L-theanine — Small gain in subjective sleep quality; effects on anxiety are inconsistent. May smooth caffeine jitters but won't offset strong stimulants like clenbuterol.
- Magnesium — Three small, low-quality trials in older adults: falling asleep about 17 minutes sooner. No good data in athletes.
- Melatonin — Helps you fall asleep a little faster, especially with a shifted body clock; does not treat anxiety or night sweats.
Acne
Gentle skin care, cleansing after training, a dermatologist if it spreads.
Supplement or OTC product
How each option helps (3)
- Adapalene — Reduces spots in many users. Redness, scaling, dryness and stinging are common early and usually ease; acne may look worse at first. Rarely, allergic swelling.
- Benzoyl peroxide — A first-line acne option. Dryness, redness and peeling are common at first; it bleaches hair and fabric; rarely, serious allergic reactions. Severe steroid acne needs a dermatologist.
- Zinc — Trials show a modest drop in inflamed spots, weaker than antibiotics; steroid acne is driven by androgens.
Hair loss
Ketoconazole shampoo, minoxidil, a dermatologist early if you are prone to it.
Supplement or OTC product
How each option helps (1)
- Minoxidil (topical) — Slows thinning and regrows some hair; scalp itching and early temporary shedding are common, unwanted facial hair possible. Gains fade once stopped.
Injection site
Sterile technique, never share needles, vials or pens; see a doctor for a hot, swollen site. If equipment was ever shared, test for HIV and hepatitis B/C and ask about hepatitis B vaccination.
Check-ups and blood tests
Which tests and check-ups to do and when. This is a guide — agree the exact schedule with your doctor.
Baseline tests
your own starting values — every later result is compared with them
Lipid panel (HDL, LDL, triglycerides, ApoB)cholesterol
Complete blood count (hematocrit, hemoglobin)hematocrit
Kidney panel (creatinine, eGFR, cystatin C)blood pressure, kidneys
Testosterone (total, free), LH, FSH, SHBGnatural testosterone
Estradiol (sensitive assay)
Home blood-pressure logblood pressure, heart, kidneys
ECGheart
Echocardiogram (heart ultrasound)heart
Urinalysiskidneys
While taking
about 4–6 weeks in, then every 6–8 weeks — agree the exact schedule with your doctor
Lipid panel (HDL, LDL, triglycerides, ApoB)cholesterol
Complete blood count (hematocrit, hemoglobin)hematocrit
Kidney panel (creatinine, eGFR, cystatin C)blood pressure, kidneys
Estradiol (sensitive assay)
Home blood-pressure logblood pressure, heart, kidneys
Urinalysiskidneys
After stopping
4–8 weeks after stopping (later after long-acting injections), then until values return to baseline
Lipid panel (HDL, LDL, triglycerides, ApoB)cholesterol
Complete blood count (hematocrit, hemoglobin)hematocrit
Kidney panel (creatinine, eGFR, cystatin C)blood pressure, kidneys
Testosterone (total, free), LH, FSH, SHBGnatural testosterone
Semen analysisnot earlier than 3 months after stopping, then every 3 months until normalnatural testosterone
Every year
with regular or repeated use
ECGheart
Echocardiogram (heart ultrasound)heart
Which doctors can help
Sports physiciancoordinates everything
Cardiologistcholesterol, blood pressure, hematocrit, heart
Endocrinologistnatural testosterone
Nephrologistkidneys
Gynecologistvirilization, natural testosterone (women)
At home
- Home blood pressure: 2–3 times a week in the morning, keep a log
Get medical help at once if
- Sudden severe headache, vision changes, numbness or weakness on one side, trouble speaking — call emergency services.
- Swelling, pain or redness in one leg; sudden shortness of breath or chest pain; sudden one-sided weakness or numbness, trouble speaking or seeing — seek urgent care.
- Chest pain or pressure, breathlessness on light effort, swollen ankles, fainting — seek urgent care.
- Much less urine than usual, cola-colored urine, new swelling, flank pain — see a doctor now.
- Deepening voice, new facial hair, clitoral enlargement — stop and see a doctor: changes can become permanent. (women)
In an emergency, call your local emergency number.
For women
Virilizing for women: voice deepening, facial and body hair and clitoral enlargement are possible and may be permanent. Its long action means effects continue for weeks after the last injection.
Myth & fact
Myth
“High creatinine on boldenone always means kidney damage.”
Fact
Not always: a case report described raised creatinine on boldenone without kidney disease, and muscle mass raises it too. Cystatin C and a urine protein test help a doctor tell real injury apart.
Combinations
No specific combination notes for this substance yet. The stack check still adds up side effects that several substances share.
Sources
Winnett G et al. Apparent renal disease due to elevated creatinine levels associated with the use of boldenone. Nephrol Dial Transplant 2011 (opens in a new tab)Mohammed HH et al. Effects of boldenone undecylenate on growth performance, maintenance behaviour, reproductive hormones and carcass traits of growing rabbits. Pol J Vet Sci 2016 (opens in a new tab)White M et al. Anabolic Androgenic Steroid Use as a Cause of Fulminant Heart Failure. Can J Cardiol 2018 (opens in a new tab)
Check how Boldenone combines with your stack
Possible side effects by body system, combinations, how to lower the risks and which tests to do — free.
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