Retatrutide

Quickstart highlights

Dosing & reconstitution guide

Standard protocol (2 mL = 5 mg/mL)

A 10 mg vial dissolved in 2 mL bacteriostatic water gives a concentration of 5 mg/mL. Calculate your own dilution →

Reconstitution steps

1. Let the vial reach room temperature and wash your hands.
2. Disinfect both rubber stoppers with an alcohol swab.
3. Draw up 2 mL of bacteriostatic water.
4. Inject the water slowly down the glass wall, not directly onto the powder.
5. Swirl gently until clear — never shake.
6. Label the vial with date and concentration and refrigerate.

Supplies needed

• Retatrutide vial (10 mg)
• Bacteriostatic water
• Mixing syringe (1–3 mL) and U-100 insulin syringes
• Alcohol swabs and sharps container

Protocol overview

Dosing protocol in research

Values as described in literature and research protocols; not dosing advice.

Storage instructions

• Lyophilised (powder): cool, dry and dark; long-term at −20 °C.
• After reconstitution: refrigerator at 2–8 °C, use within ~4 weeks.
• Avoid repeated freezing and thawing.

Important notes

How this works

Retatrutide is an experimental peptide currently under investigation in clinical trials. It belongs to a new class of compounds that simultaneously activate three different hormone receptors. Research primarily focuses on its application for obesity, type 2 diabetes, and fatty liver disease.

This molecule acts as a triple agonist on the GLP-1, GIP, and glucagon receptors. Activation of GLP-1 and GIP suppresses appetite and regulates insulin release based on blood glucose levels. The addition of glucagon stimulation distinguishes this compound from earlier incretin mimetics; this mechanism potentially increases energy expenditure and fat oxidation directly in the liver. The peptide features a fatty-acid chain that promotes albumin binding. Consequently, retatrutide has a half-life of approximately six days, allowing for weekly administration in research protocols.

In phase 2 trials involving adults with obesity, weekly dosing led to an average weight loss of approximately 24% after 48 weeks. Significant reductions in liver fat and improvements in blood glucose levels were also observed. Retatrutide is currently still being studied in phase 3 trials and is not approved by any authority for human use. It is listed on the WADA prohibited list for athletes under the category of metabolic modulators. Many questions remain regarding long-term safety and effects across different patient populations.

Potential benefits & side effects

Effects described in research

• Very strong weight loss in phase 2
• Reduction in liver fat
• Increased energy expenditure via glucagon receptor

Common side effects

• Nausea and reduced appetite
• Diarrhoea or constipation
• Belching, bloating
• Rare: pancreatitis, gallstones
• Increased heart rate

The most frequently reported side effects in studies are nausea, diarrhea, and vomiting, particularly during the initiation phase. A transient increase in heart rate has also been observed at higher doses. As the compound is still under investigation, its full side-effect profile and long-term risks have not yet been established.

Contraindications

• Personal/family history of medullary thyroid cancer or MEN2
• History of pancreatitis
• Pregnancy or breastfeeding
• Type 1 diabetes

Lifestyle factors

• Smaller, protein-rich meals reduce GI complaints.
• Stay well hydrated; dehydration worsens nausea and constipation.
• Resistance training helps preserve lean mass during weight loss.
• Limit alcohol and very fatty meals.

Injection technique

• Choose a site with subcutaneous fat: abdomen (5 cm from the navel), thigh or back of upper arm.
• Disinfect, pinch a skin fold and insert at a 45–90° angle.
• Inject slowly, wait 5 seconds and withdraw.
• Rotate sites and use each needle once.

Recommended source

Quality varies widely between suppliers. Look for an independent HPLC/MS lab report per batch, purity ≥ 98% and clear storage and shipping conditions.

As a reference we use the Retatrutide from PeptideWinkel, which publishes lab reports per batch.

Frequently asked questions