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Best Peptides to Increase Testosterone Naturally Ranked: Mechanism Comparison
MK-677 GH secretagogue (ghrelin receptor agonist) Indirect LH stimulation via IGF-1 feedback; 15–20% increase in men with low baseline 12.5–25 mg oral daily before bed 60–70% oral (high first-pass stability) Best for men over 35 with concurrent GH and testoste
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- MK-677
- GH secretagogue (ghrelin receptor agonist)
- Indirect LH stimulation via IGF-1 feedback; 15–20% increase in men with low baseline
- 12.5–25 mg oral daily before bed
- 60–70% oral (high first-pass stability)
- Best for men over 35 with concurrent GH and testosterone decline; significant appetite increase limits compliance
- CJC-1295/Ipamorelin
- GH-releasing hormone analogue + selective GH secretagogue
- Indirect LH modulation; 12–18% increase with minimal ghrelin side effects
- 100–200 mcg each subcutaneous 3x weekly
- 85–92% subcutaneous
- Superior side effect profile to MK-677; requires consistent injection schedule for sustained effect
- Thymalin
- Thymic immune regulator
- Cytokine modulation reduces inflammatory suppression of steroidogenesis; 10–15% increase in men with elevated hsCRP
- 5–10 mg subcutaneous 2x weekly for 8 weeks
- 80–88% subcutaneous
- Most effective in men with metabolic syndrome or chronic inflammation; minimal effect in healthy low-inflammation individuals
- Tesofensine
- Triple monoamine reuptake inhibitor
- Indirect via fat loss and reduced aromatase activity; 12–18% free testosterone increase with 15%+ body fat reduction
- 0.5–1.0 mg oral daily
- 75–82% oral
- Requires sustained fat loss to produce testosterone effect; not a direct HPG axis modulator
- Cartalax
- Mitochondrial biogenesis peptide
- Supports testicular mitochondrial function and steroidogenic enzyme activity
- 5–10 mg subcutaneous 2–3x weekly
- 78–85% subcutaneous
- Adjunct to other interventions; effects most pronounced when stacked with metabolic optimizers