GHRP-6 Dosage Guide

GHRP-6 dosing — expressed in micrograms (mcg) per injection — is better established than many research peptides because GHRP-6 has been used in published human clinical studies. The commonly used 100–300 mcg range is derived from a combination of clinical trial data, dose-response research, and decades of community experience.

Clinical Studies

GHRP-6 has been studied in human subjects at doses ranging from 1 mcg/kg to 2 mcg/kg intravenously and subcutaneously. Studies by Arvat, Ghigo, and others demonstrated robust, dose-dependent GH release. At 1 mcg/kg (approximately 75–100 mcg for a 75 kg individual), significant GH elevation was consistently observed. Higher doses (2 mcg/kg) produced greater GH peaks but with increased cortisol and prolactin co-release, establishing the dose-dependent side effect profile.

Dose-Response & Saturation

Research indicates that GHRP-6's GH-releasing effect follows a saturation curve. Doses beyond approximately 200–300 mcg per injection (roughly 2–3 mcg/kg) produce diminishing additional GH release while continuing to increase cortisol, prolactin, and appetite side effects. This is why the community standard does not typically exceed 300 mcg per injection — going higher adds side effects without proportionally more GH.

Community & Practitioner Experience

Over two decades of community use have established the 100–300 mcg subcutaneous protocol as the practical standard. Beginners typically start at 100 mcg to assess appetite tolerance and gradually increase. The 200 mcg dose represents the most common balance between efficacy and manageable side effects. The 300 mcg dose is used by experienced users seeking maximum GH output and who can manage the appetite response.

GHRP-6 is supplied as a lyophilized (freeze-dried) powder, typically in 5 mg or 10 mg vials. You reconstitute it with bacteriostatic water, then draw your dose using an insulin syringe. The concentration depends on how much water you add to the vial.

Quick Reference — 5 mg Vial

GHRP-6's core mechanism — GH release via GHS-R1a activation — remains consistent, but the optimal dose and frequency depend on your primary goal. The intense appetite stimulation is a major factor in protocol selection.

GH Optimization & Anti-Aging

The most straightforward application — using GHRP-6 to elevate GH and IGF-1 for improved sleep quality, skin health, recovery, and general vitality. Lower doses minimize appetite and cortisol/prolactin side effects while still producing meaningful GH pulses.

• Dose: 100–200 mcg per injection (SubQ)
• Frequency: 2x daily (morning fasted + bedtime)
• Duration: 8–12 weeks on, 4 weeks off
• Appetite note: Manageable at 100–150 mcg; more pronounced at 200 mcg

Muscle Growth & Bulking

GHRP-6 is often favored for bulking phases because the intense appetite stimulation helps users eat in a caloric surplus. Elevated GH and IGF-1 support lean mass accretion, nitrogen retention, and recovery from training. This is GHRP-6's strongest use case.

• Dose: 200–300 mcg per injection (SubQ)
• Frequency: 2–3x daily (morning, post-workout, bedtime)
• Duration: 8–12 weeks on, 4 weeks off
• Appetite note: Embrace the hunger — have a protein-rich meal planned 20–30 minutes after each injection

Appetite Stimulation & Weight Recovery

For users who struggle to eat enough — whether from medical conditions, chronic illness, or post-surgical recovery — GHRP-6's appetite effect is the primary benefit. The GH elevation provides additional recovery support.

• Dose: 100–200 mcg per injection (SubQ)
• Frequency: 2–3x daily, timed 20–30 minutes before planned meals
• Duration: As needed; 4–12 weeks is typical
• Appetite note: Time injections to align with meal schedule for maximum food intake

Fat Loss

Using GHRP-6 for fat loss is possible but challenging due to the intense appetite stimulation. GH promotes lipolysis (fat breakdown) and spares lean mass during caloric restriction. However, the hunger side effect can undermine a caloric deficit. Disciplined users can manage this, but Ipamorelin is generally a better choice for fat loss protocols.

• Dose: 100–150 mcg per injection (keep dose lower to minimize hunger)
• Frequency: 2x daily (morning fasted + bedtime)
• Duration: 8–12 weeks on, 4 weeks off
• Appetite note: Requires strict dietary discipline; consider switching to Ipamorelin if appetite control is too difficult

Recovery & Injury Support

Elevated GH and IGF-1 from GHRP-6 support tissue repair, collagen synthesis, and overall recovery from training or injury. GHRP-6's independent cytoprotective effects may provide additional benefit for cardiac and gastric tissue repair. For targeted musculoskeletal injury recovery, stacking with BPC-157 is common.

• Dose: 150–200 mcg per injection (SubQ)
• Frequency: 2–3x daily
• Duration: 8–12 weeks on, 4 weeks off
• Stack tip: Add BPC-157 at 250 mcg 1–2x daily near the injury site for synergistic recovery

GHRP-6 is typically run in defined cycles to prevent potential receptor desensitization and to allow periodic assessment of progress. Continuous use beyond 12 weeks without a break may lead to diminished GH output as GHS-R1a receptors downregulate.

Optimal Injection Timing

• Dose 1 — Morning (fasted): Inject immediately upon waking. Wait 20–30 minutes, then eat breakfast. Takes advantage of the overnight fast.
• Dose 2 — Afternoon/Post-workout: Inject at least 2 hours after your last meal. If training, inject post-workout (assuming you are 2+ hours fasted). Wait 20–30 minutes, then eat.
• Dose 3 — Bedtime: The most important dose. Inject 2–3 hours after dinner, right before bed. Synergizes with the natural nocturnal GH surge during deep sleep. No post-injection eating needed — go to sleep.

Common Side Effects

Expected and dose-dependent:

• Intense appetite stimulation — the #1 side effect and the most pronounced of any GHRP. Begins 20–30 minutes post-injection and lasts 1–2 hours. Dose-dependent.
• Water retention — mild to moderate, particularly in the first 1–2 weeks. Typically resolves as the body adjusts or diminishes after cycle completion.
• Injection site redness, soreness, or minor swelling — standard SubQ injection response; resolves with rotation.
• Tiredness or drowsiness after injection — more common with the bedtime dose; actually beneficial for sleep quality.
• Tingling or numbness in extremities — occasionally reported, usually transient.

Moderate (dose-dependent):

• Cortisol elevation — moderate and transient. More pronounced than Ipamorelin but less than Hexarelin. Generally not clinically significant at standard doses but worth monitoring with bloodwork.
• Prolactin elevation — moderate and transient. At standard doses, unlikely to cause symptoms. At higher doses or with prolonged use, monitor for nipple sensitivity or gynecomastia symptoms.
• Blood glucose fluctuations — GH's counter-regulatory effect can raise fasting blood sugar. Monitor if diabetic or pre-diabetic.

Contraindications

• Active cancer or history of cancer — GH and IGF-1 elevation may theoretically promote tumor growth. Avoid use with active malignancies.
• Pregnancy and breastfeeding — no safety data exists for GHRP-6 during pregnancy or nursing. Avoid use entirely.
• Uncontrolled diabetes — GHRP-6 can raise blood glucose through GH's counter-regulatory effects. Users with uncontrolled blood sugar should not use GHRP-6 without close medical supervision.
• Pituitary tumors or disorders — GHRP-6 stimulates the pituitary directly. Avoid use with known pituitary adenomas or other pituitary pathology.
• Active infections at the injection site — do not inject through infected, inflamed, or broken skin.

Bloodwork Monitoring

If using GHRP-6 for more than 4 weeks, consider monitoring:

• IGF-1: Confirms GH axis stimulation; should be elevated during use
• Fasting blood glucose & HbA1c: Monitor for GH-related insulin resistance
• Prolactin: Check if experiencing nipple sensitivity or other symptoms
• Cortisol (morning): Baseline and mid-cycle to assess adrenal impact

When to Stop

• Persistent water retention or edema that does not resolve
• Signs of elevated prolactin (nipple sensitivity, gynecomastia symptoms)
• Unmanageable appetite that is undermining your dietary goals
• Blood glucose consistently elevated on fasting bloodwork
• Any symptom that feels unusual or concerning — err on the side of caution