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G1 Peptides
Retatrutide Pen

Weight & Metabolic

Retatrutide Pen

SKU: G1H-RETA-PEN

$530

Retatrutide — Self-Injection Pen (3 Month Supply)

Retatrutide is a next-generation triple agonist that hits the GIP, GLP-1, and glucagon receptors at once — the trifecta drawing the most interest in metabolic research. It is studied for powerful appetite reduction, sustained weight loss, and steadier blood sugar on a once-weekly cadence. Delivered as a prefilled, click-dose self-injection pen — compounded in a US-licensed pharmacy and shipped cold-chain. Refrigerator-stable; store at 2–8°C. For use under licensed-provider supervision.

Key Benefits

  • Significant appetite reduction
  • Sustained weight loss with weekly dosing
  • Steadier blood sugar through the day
  • The next generation of metabolic peptides

Tools & reading

DOSAGE CALCULATORRetatrutide →

About Retatrutide Pen

Retatrutide Pen contains Retatrutide, supplied as a prefilled, multi-dose injection pen.

In published research, Retatrutide has been studied for weight management, liver fat reduction, appetite control, and energy expenditure. Research interest is not proof of benefit, and individual results vary.

A licensed provider is available to answer questions before you order.

The active ingredient

Retatrutide

Retatrutide is a triple agonist — it acts on GIP, GLP-1, and glucagon receptors — and is taken once a week. In phase 2 trials it produced the largest average weight reduction reported for an incretin drug, with the usual GLP-1-class digestive side effects during escalation.

Studied forWeight management · Liver fat reduction · Appetite control · Energy expenditure

How it works
Triple agonist (GLP-1 / GIP / glucagon)
Status
Phase 3
Half-life
~6 days

What is Retatrutide? →Retatrutide dosage calculator →Compare Retatrutide →

How it is supplied

  • Prefilled and ready to use. There is nothing to mix and no syringe to measure.
  • Multi-dose: you dial the dose your provider prescribes for each injection.
  • Injected subcutaneously, into the fatty layer just under the skin.
  • Storage: Refrigerated (2–8 °C); use within the pharmacy beyond-use date.
  • Compounded in US pharmacies, third-party tested, and shipped cold-chain.

How to inject peptides subcutaneously →

Dosing context

  • Published protocols for Retatrutide describe 1–12 mg weekly. Onset is typically reported at 1–4 weeks for appetite reduction.
  • These figures are context from the literature, not instructions. Your provider sets your dose and schedule.

Retatrutide dosage calculator →

Safety

  • Risks noted in the literature: nausea, vomiting, diarrhea, constipation, and modest heart-rate increase.
  • Tell your provider about every medication and condition before starting, and report anything unexpected.
  • Not for use during pregnancy or breastfeeding unless your provider directs otherwise.

Peptide side effects and safety →Who should not use peptides →

How ordering works

  1. Place your order online. A consultation with a licensed provider is available at no charge if you want guidance first.
  2. Your order is prepared and shipped cold-chain to your door.
  3. Questions after it arrives go to our support team or your provider.

Book a free consultation →

Questions

What is in Retatrutide Pen?
Retatrutide Pen contains Retatrutide. Retatrutide is a triple agonist — it acts on GIP, GLP-1, and glucagon receptors — and is taken once a week. In phase 2 trials it produced the largest average weight reduction reported for an incretin drug, with the usual GLP-1-class digestive side effects during escalation.
Do I need a prescription for Retatrutide Pen?
A prescription is not required to order Retatrutide Pen. A free consultation with a licensed provider is available if you want guidance.
Do I need to mix the Retatrutide Pen?
No. The pen arrives prefilled. You dial the dose your provider prescribes and inject under the skin.
How should I store Retatrutide Pen?
Refrigerated (2–8 °C); use within the pharmacy beyond-use date.
How is Retatrutide Pen shipped?
Orders ship cold-chain, in insulated packaging, so the product stays within its temperature range in transit.

For educational purposes only. These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease. Use only under the guidance of a licensed provider.