Peptide profile

Tirzepatide

Mounjaro / Zepbound / Twincretin / GIP/GLP-1 dual agonist

Fat Loss

The next-generation dual GIP/GLP-1 agonist — delivering superior weight loss outcomes to semaglutide alone, now TGA-approved in Australia.

Evidence Level

Anecdotal
Emerging
Moderate
Strong

Legal Status

TGA Approved

Dosage

2.5 mg/week (starting dose), titrate to 5, 10, or 15 mg/week

Route

subcutaneous injection

How it works

Activates both GIP (glucose-dependent insulinotropic polypeptide) and GLP-1 (glucagon-like peptide-1) receptors simultaneously. GIP receptor activation works synergistically with GLP-1 signalling to enhance insulin secretion, reduce glucagon levels, slow gastric emptying, and suppress appetite through central nervous system pathways. The dual mechanism produces greater appetite suppression and metabolic improvement than GLP-1 agonism alone. Clinical trials demonstrate that tirzepatide's GIP component may enhance fat cell lipolysis directly — an effect not seen with GLP-1-only agents — contributing to its superior fat loss outcomes.

Research summary

TGA-approved in Australia as Mounjaro (type 2 diabetes) and Zepbound (chronic weight management). The SURMOUNT-1 trial (2022) is the pivotal efficacy study: 2,539 adults without diabetes achieved an average 20.9% body weight reduction at the highest dose (15 mg) over 72 weeks — significantly exceeding semaglutide's 14.9% in the STEP 1 trial. A head-to-head trial (SURMOUNT-5, 2024) directly compared tirzepatide to semaglutide and confirmed tirzepatide's superior weight loss at equivalent therapeutic doses. Currently the most effective approved pharmacological weight management option available in Australia.

Cycle duration

Ongoing — minimum 12 months for full therapeutic effect

Stacks well with

These peptides complement Tirzepatide's mechanism and are commonly combined in protocols.

Fat Loss
Strong

Semaglutide

The most clinically proven GLP-1 medication for weight management and metabolic health.

0.25 mg/week (titrate to 2.4 mg/week over 16 weeks)View

Free tool

Protein targets for your Tirzepatide

Protein requirements vary significantly by protocol goal and activity level.

80kg

160g

Daily total

53g

Per meal (3 meals)

2.0g/kg

Per kg bodyweight

Top sources to hit 160g daily

Chicken breast (cooked)~520g hits target
Whey protein (1 scoop ~30g)~200g hits target
Salmon fillet (cooked)~640g hits target
Eggs~23 eggs hits target
Greek yoghurt (200g serve)~8 serves hits target
Lean beef mince (cooked)~620g hits target

How this connects to your protocol

On GLP-1 protocols, hitting protein targets is your most critical nutritional variable. Semaglutide suppresses appetite — the risk is eating too little protein and losing muscle alongside fat. This number protects your lean mass.

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Targets are evidence-based estimates. Consult your practitioner for personalised advice.

Risks & side effects

Nausea, vomiting, and diarrhoea during titration (similar to semaglutide but often milder)
Potential pancreatitis risk — discontinue if abdominal symptoms develop
Weight regain on cessation — similar trajectory to semaglutide
Not PBS-listed for weight loss in Australia as of 2025 — significant out-of-pocket cost
Contraindicated in personal or family history of medullary thyroid carcinoma

How to access in Australia

This medication is TGA-approved and available with a prescription from any Australian GP or specialist. Contact a telehealth clinic below for convenient access.

Find a prescriber

Australian clinics that prescribe Tirzepatide or treat related goals.

Rx

Thrive Rx

Telehealth Clinic
4.8(312)

Australia's most thorough longevity and peptide clinic — blood panel first, protocol second.

$199–$599 AUD / month Australia-wide
AHPRA-registered clinicians
Comprehensive blood panel included in membership
Ongoing biomarker tracking every 6 months
Higher price point than GLP-1 only clinics
Requires full health assessment before any prescription
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PX

Phyx

Telehealth Clinic
4.7(260)

The Home of Longevity — performance-focused peptide therapy, supplements, and Afterpay-supported plans across Australia.

$150–$500 AUD / month Australia-wide
One of the widest peptide menus in Australia — 19+ compounds available
Afterpay available — pay in 4 easy instalments
Includes hard-to-find peptides: Epitalon, MOTS-C, Oxytocin, DHEA
Newer brand — less established review base than Thrive Rx or Pilot
Premium pricing on some specialised compounds

Peptides available (19)

AOD 9604CJC 1295IpamorelinHCGMOTS-CBPC 157CJC 1295 + IpamorelinTB-500+11 more
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J

Juniper

Telehealth Clinic
4.6(4,821)

Australia's largest women's GLP-1 weight loss program — 100,000+ patients.

Weight loss only
$129–$299 AUD / month Australia-wide
Largest patient base in Australia — 100,000+ women
Integrated app with health coaching and nutrition plan
LegitScript certified for safety and compliance
Women only — men should see Pilot (sister platform) instead
GLP-1 weight loss focus only — not a full peptide clinic
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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.

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