Peptide profile
GHRP-6
Growth Hormone Releasing Peptide 6 / His-D-Trp-Ala-Trp-D-Phe-Lys-NH2
A first-generation GH releasing peptide with a pronounced appetite effect — favoured for serious bulking phases.
Evidence Level
Legal Status
Dosage
Route
How it works
Stimulates the pituitary to release growth hormone by mimicking ghrelin. Unlike Ipamorelin (which is selective), GHRP-6 also raises cortisol and prolactin at higher doses, and produces a strong hunger signal — which can be advantageous during a muscle-building phase where caloric surplus is the goal.
Research summary
One of the earliest synthetic GHRPs with a well-established pre-clinical and clinical profile. Multiple human studies confirm GH pulse augmentation. Clinical use has largely shifted to more selective compounds (Ipamorelin) due to the cortisol and prolactin side effects. Still used by some practitioners specifically for the appetite-stimulating effect in underweight or muscle-wasting patients.
Cycle duration
8–12 weeks
Stacks well with
These peptides complement GHRP-6's mechanism and are commonly combined in protocols.
IGF-1 LR3
The most anabolic peptide available — directly stimulates muscle cell growth and satellite cell activation.
Ipamorelin + CJC-1295
The gold standard GH-releasing combination for anti-ageing, body recomposition, and sleep quality.
MK-677
An oral GH secretagogue — the only non-injectable option for sustained growth hormone elevation.
Free tool
Protein targets for your GHRP-6
Protein requirements vary significantly by protocol goal and activity level.
176g
Daily total
59g
Per meal (3 meals)
2.2g/kg
Per kg bodyweight
Top sources to hit 176g daily
How this connects to your protocol
On GH and IGF-1 protocols, protein is your primary building material. Without sufficient amino acid availability, peptide-driven anabolic signals have nothing to build with.
Targets are evidence-based estimates. Consult your practitioner for personalised advice.
Risks & side effects
How to access in Australia
This peptide is classified as Schedule 4 in Australia, meaning it requires a prescription from an AHPRA-registered practitioner. It is typically dispensed through a licensed compounding pharmacy.
Find a prescriber
Australian clinics that prescribe GHRP-6 or treat related goals.
Thrive Rx
Telehealth ClinicAustralia's most thorough longevity and peptide clinic — blood panel first, protocol second.
ProtocolHub may earn a commission if you visit this partner. This does not affect our ratings.
Phyx
Telehealth ClinicThe Home of Longevity — performance-focused peptide therapy, supplements, and Afterpay-supported plans across Australia.
Peptides available (19)
ProtocolHub may earn a commission if you visit this partner. This does not affect our ratings.
GL Vitality Drips
Telehealth ClinicDoctor-prescribed peptides and NAD+ therapy delivered Australia-wide — nurse-led care with AHPRA-registered practitioners and licensed compounding pharmacies.
ProtocolHub may earn a commission if you visit this partner. This does not affect our ratings.
Medical disclaimer
The information on this page is for educational purposes only and does not constitute medical advice. All peptide and supplement therapies should be discussed with an AHPRA-registered medical practitioner before use. ProtocolHub does not prescribe, dispense, or supply any therapeutic goods. Always consult a qualified healthcare professional before starting any new health protocol.
Ready to start a protocol?
Get a complete protocol built around your goal — peptides, supplements, training, and nutrition.
Build my complete protocol