GHRP-2 vs GHRP-6: GH Secretagogue Comparison

GHRP-2 vs GHRP-6: GH Secretagogue Comparison GHRP-2 vs GHRP-6 compared: GH secretagogue differences, hunger stimulation, cortisol/prolactin effects, GH pulse amplitude, dosing, cost, and research applications. GHRP-2 (pralmorelin) and GHRP-6 are synthetic hexapeptide growth hormone secretagogues that stimulate GH release through the ghrelin receptor (GHSR-1a). GHRP-2 produces slightly stronger GH pulses with moderate appetite stimulation and minimal cortisol/prolactin effects, making it the more selective option. GHRP-6 produces strong GH release with pronounced hunger stimulation and slightly more cortisol/prolactin elevation. The key differentiator is appetite: GHRP-6 causes intense hunger while GHRP-2 is more manageable. Both are commonly paired with GHRH analogs (CJC-1295 or sermorelin) for synergistic GH release. Mechanism Ghrelin receptor (GHSR-1a) agonist; selective Ghrelin receptor (GHSR-1a) agonist; broader activity Evidence Grade B+ GH Pulse Amplitude ~30-45 ng/mL (strongest GHRP) ~25-35 ng/mL Hunger Stimulation Moderate (manageable) Intense (pronounced, rapid onset) Cortisol Effect Minimal at standard doses Mild elevation Prolactin Effect Route Subcutaneous injection Typical Dose 100 - 300 mcg, 2-3x/day Half-Life ~30-60 minutes ~20-30 minutes Best For Max GH pulse with minimal side effects GH release + appetite stimulation (bulking) FDA Status Not FDA-approved; approved in Japan (diagnostic) Not FDA-approved; research compound Cost (research grade) $ Strongest GH pulse amplitude among GHRPs More selective receptor activity Minimal cortisol and prolactin elevation Manageable hunger stimulation Approved in Japan for GH stimulation testing Excellent synergy with GHRH analogs Requires 2-3 injections daily Short half-life Not FDA-approved therapeutically May still increase appetite (less than GHRP-6) Must be taken on empty stomach for best results Strong GH release Appetite stimulation beneficial for bulking Well-studied among GH secretagogues Low cost and widely available Good synergy with GHRH analogs Gastroprotective properties noted in some studies Intense hunger can be counterproductive for cutting More cortisol elevation than GHRP-2 More prolactin elevation than GHRP-2 Slightly lower GH pulse than GHRP-2 Shorter half-life than GHRP-2 Not FDA-approved Choose GHRP-2 if: You want maximum GH pulse amplitude with the cleanest side effect profile among GHRPs. GHRP-2 is the preferred secretagogue when appetite stimulation is unwanted (during caloric deficit or fat loss protocols), or when minimizing cortisol/prolactin elevation is important. It is the most selective GHRP available. Choose GHRP-6 if: Appetite stimulation is desired — during bulking phases, recovery from illness, or protocols where increased caloric intake is beneficial. GHRP-6's pronounced ghrelin activity makes it uniquely suited for research on appetite-GH interactions. It is also the best-studied GHRP for gastroprotective effects. Consider ipamorelin instead if: You want the cleanest GH secretagogue with virtually zero hunger stimulation and no cortisol/prolactin effects. Ipamorelin produces a weaker GH pulse than either GHRP-2 or GHRP-6 but has the most favorable side effect profile in the GHRP family. Yes, GHRP-6 causes significantly more hunger through strong ghrelin-mimetic activity, producing intense appetite within 15-20 minutes. GHRP-2 has more selective receptor activity with moderate, manageable appetite stimulation. If hunger is undesirable, GHRP-2 or ipamorelin are preferred. GHRP-2 produces slightly stronger GH pulses (30-45 ng/mL) compared to GHRP-6 (25-35 ng/mL) at equivalent doses. The difference is modest but GHRP-2 is considered the most potent in the GHRP family, followed by GHRP-6, with ipamorelin producing the weakest but cleanest pulse. Both can raise cortisol and prolactin, with GHRP-6 slightly more than GHRP-2. At doses of 100mcg or below, elevations are modest and transient. Both are much less impactful than hexarelin. Ipamorelin has virtually no effect on cortisol or prolactin. Verified Research Suppliers ★ LiveWell Peptides — Preferred Vendor • cGMP Certified Preferred vendor Core Peptides — Third-party tested — Broad catalog Biotech Peptides — USA-based Related Resources