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Best Peptides for Testosterone Replacement: Mechanism Comparison
| Compound | Primary Mechanism | HPG Axis Impact | Typical Research Dose | Time to Measurable Effect | Recovery After Cessation | Professional Assessment ||—|—|—|—|—|—|| Gonadorelin | GnRH receptor agonist. Stimulates LH/FSH release | Preserves axis when dosed
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- | Compound | Primary Mechanism | HPG Axis Impact | Typical Research Dose | Time to Measurable Effect | Recovery After Cessation | Professional Assessment ||—|—|—|—|—|—|| Gonadorelin | GnRH receptor agonist. Stimulates LH/FSH release | Preserves axis when dosed pulsatile | 25 mcg every 90 min subcutaneous | 4–6 weeks for sustained testosterone elevation | Immediate. No suppression occurs | Best for hypogonadotropic hypogonadism models where upstream signaling is impaired || Kisspeptin-10 | Hypothalamic GnRH neuron activator | No suppression. Enhances natural pulsatility | 1 nmol/kg IV (single dose studies) | 90 minutes for acute LH spike; chronic effects require repeated dosing | Immediate. No suppression | Experimental. Limited long-term human data; high potential for fertility-preserving protocols || Enclomiphene | Estrogen receptor antagonist (hypothalamus/pituitary) | Preserves axis. Removes negative feedback without replacing hormones | 12.5–25 mg oral daily | 4–6 weeks for testost