MK-2866 vs SLU-PP-332
Moderate Research vs Emerging
avoid Mechanism-based · 53% Both MK-2866 and SLU-PP-332 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 SLU-PP-332
Weight 389.33 Da 290.32 Da
Half-life ~24 hours Under investigation (no human PK data)
Chain — Non-peptide small molecule
Type Non-steroidal selective androgen receptor modulator (C19H14F3N3O3) Synthetic ERR agonist
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
SLU-PP-332
01 Exercise mimetic effects without physical activity
02 12% weight loss in 28 days
03 70% increased endurance
04 25% enhanced fatty acid oxidation
05 Improved insulin sensitivity
06 Reduced hepatic steatosis
07 Cardiac protection
08 Reversal of age-related mitochondrial dysfunction
Dosing Protocols
MK-2866
10-25 mg/day oral / Once daily
SLU-PP-332
NO HUMAN DOSE ESTABLISHED (animal studies: 50 mg/kg IP) / Research only - not approved for human use
Standard Metabolic Protocol 50 mg/kg (animal dosing) Twice daily
Acute Exercise Enhancement 50 mg/kg (animal dosing) Single dose 1 hour pre-exercise
Extended Treatment 50 mg/kg (animal dosing) Twice daily for 4-8 weeks
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
SLU-PP-332
Animal studies show favorable safety with no severe effects at therapeutic doses
Well-tolerated in rodents and canines
No liver, kidney, or cardiac toxicity documented
No lean mass loss
Does not suppress hormones or act as stimulant
Minor plasma cholesterol and liver enzyme changes in some studies
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
NOT FOR HUMAN USE - no approved human dose
No human clinical trials conducted
Potential interaction with diabetes medications
Research Evidence
MK-2866 SLU-PP-332
Status Moderate Research Emerging
References 5 studies 4 studies
Latest — 2025
FDA Approved No No
This comparison is for educational and research purposes only. Consult a healthcare professional before use.