Understand the source comparison
Best Peptides for Testosterone Boost: Compound Comparison
MK 677 (Ibutamoren) Ghrelin receptor agonist. Stimulates continuous GH release 12.5–25mg daily Once daily (oral or subcutaneous) 15–25% increase in free testosterone over 8–12 weeks in clinical trials Best for sustained GH elevation with minimal injection freq
No winner is assigned.
This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- MK 677 (Ibutamoren)
- Ghrelin receptor agonist. Stimulates continuous GH release
- 12.5–25mg daily
- Once daily (oral or subcutaneous)
- 15–25% increase in free testosterone over 8–12 weeks in clinical trials
- Best for sustained GH elevation with minimal injection frequency. Side effects include increased appetite and mild water retention
- CJC-1295 with DAC
- GHRH analog. Extends natural GH pulse duration
- 1–2mg weekly
- Once weekly (subcutaneous)
- Indirect testosterone support via IGF-1 elevation. 20–30% IGF-1 increase documented
- Ideal for low-frequency protocols. Long half-life reduces injection burden but may cause mild GH desensitization with prolonged use
- Ipamorelin
- Selective GH secretagogue. Amplifies natural GH pulses without cortisol/prolactin elevation
- 200–300mcg per dose
- 2–3 times daily or before bed
- Supportive data showing improved body composition and IGF-1. Testosterone effects indirect
- Cleanest side effect profile among secretagogues. Pairs well with CJC-1295 for synergistic effect
- Hexarelin
- Potent GHRP. Strong GH release but with cortisol/prolactin co-secretion
- 100–200mcg per dose
- Once daily (subcutaneous)
- Short-term studies show robust IGF-1 elevation. Testosterone data limited to observational reports
- Most potent GH response but higher desensitization risk. Not recommended for long-term continuous use
- Thymalin
- Thymic peptide. Restores immune-endocrine signaling
- 5–10mg per cycle (typically 10 days on, 20 days off)
- Daily during cycle phase
- Russian studies in aging populations show normalization of testosterone alongside immune markers
- Best for men with age-related HPG axis decline. Works upstream rather than through direct GH stimulation
- Kisspeptin
- GnRH secretagogue. Directly stimulates hypothalamic-pituitary axis
- 1–4nmol/kg per dose (clinical range)
- Variable. Research protocols differ
- Used in clinical trials for hypogonadotropic hypogonadism with positive LH/FSH response
- Most targeted intervention for hypothalamic dysfunction. Limited availability outside research settings