MK-2866 vs Turinabol
Moderate Research vs Moderate Research
avoid Mechanism-based · 64% Both MK-2866 and Turinabol carry hepatotoxic risk. Combining hepatotoxic compounds significantly increases liver damage potential. If unavoidable, include liver support (TUDCA/NAC) and monitor ALT/AST frequently.
Molecular Data
MK-2866 Turinabol
Weight 389.33 Da 334.88 Da
Half-life ~24 hours ~16 hours
Type Non-steroidal selective androgen receptor modulator (C19H14F3N3O3) 17-alpha-alkylated anabolic-androgenic steroid (C20H27ClO2)
Key Benefits
MK-2866
01 Increases lean body mass in a dose-dependent manner with clinical trial support
02 Preserves muscle mass during caloric deficit or catabolic conditions
03 Selective tissue activity reduces androgenic side effects compared to anabolic steroids
04 Oral bioavailability eliminates the need for injections
05 Does not aromatize to estrogen, avoiding gynecomastia and water retention
06 Improves physical function and stair-climbing power in clinical populations
07 Long 24-hour half-life allows convenient once-daily dosing
08 Mild side effect profile at commonly studied doses
Turinabol
01 Promotes lean, dry muscle gains without water retention or bloating
02 Does not aromatize to estrogen, eliminating risk of gynecomastia and estrogen-related side effects
03 Favorable anabolic-to-androgenic ratio, reducing androgenic side effects relative to muscle-building potential
04 Enhances muscular endurance and recovery through increased red blood cell production
05 Increases strength without significant body weight gain, beneficial for weight-class athletes
06 Improves creatine phosphate resynthesis, supporting repeated high-intensity efforts
07 Relatively mild androgenic profile compared to most oral anabolic steroids
08 Produces slow, steady, maintainable gains rather than rapid temporary increases
Side Effects
MK-2866
Mild testosterone suppression (dose-dependent, typically 10-30% reduction at 25 mg)
HDL cholesterol reduction (10-20% suppression observed in clinical trials)
Headaches, particularly during the first 1-2 weeks
Mild back pain or muscle cramps
Transient fatigue toward the end of longer cycles
Slight reduction in libido at higher doses or extended cycle lengths
Turinabol
Hepatic stress with elevated liver enzymes (ALT, AST) -- moderate severity, dose- and duration-dependent
HDL cholesterol suppression (significant, often 30-50% reduction)
LDL cholesterol elevation
Suppression of endogenous testosterone production via HPG axis negative feedback
Mild gastrointestinal discomfort or nausea
Back pumps (lower back tightness during exercise, common with 17-alpha-alkylated compounds)
Oily skin and mild acne
Decreased appetite in some users
Contraindications
Active liver disease or significantly elevated liver enzymes
Hormone-sensitive cancers (breast, prostate) without oncologist clearance
Pregnancy or breastfeeding (potential endocrine disruption to fetus/infant)
Individuals under 21 years of age (risk of premature HPTA disruption during development)
Concurrent use of hepatotoxic medications without liver function monitoring
Known hypersensitivity to MK-2866 or any formulation excipients
Competitive athletes subject to WADA or USADA anti-doping testing
Known or suspected prostate cancer
Breast cancer in males
Pregnancy or planned pregnancy (teratogenic risk)
Active liver disease or significant hepatic impairment
Pre-existing severe dyslipidemia or cardiovascular disease
Hypersensitivity to turinabol or related compounds
Research Evidence
MK-2866 Turinabol
Status Moderate Research Moderate Research
References 5 studies 5 studies
Latest — June 2023
FDA Approved No No
This comparison is for educational and research purposes only. Consult a healthcare professional before use.