The Reta injection pen is a pre-filled, ready-to-use research delivery device containing Retatrutide in pre-dissolved solution. Available in five total-content variants — 10 mg, 20 mg, 30 mg, 40 mg, and 60 mg — the pen is designed for precise, reproducible volumetric dispensing in a laboratory or controlled research setting. No reconstitution, mixing, or volume calculation is required prior to use.

Research background

Retatrutide is a synthetic peptide investigated as a triple receptor agonist with activity at the GIP, GLP-1, and glucagon receptors. It has been studied in the context of metabolic research, with particular reference in the scientific literature to energy homeostasis and lipid metabolism pathways. Research into its receptor-binding kinetics and downstream signalling effects continues to be an active area of biochemical investigation.

Pen contents & click system

Each pen contains 3 ml of pre-dissolved Retatrutide solution and is supplied with 7 insulin needles and alcohol swabs. Volume is dispensed via a calibrated click mechanism: each click of the dial corresponds to a fixed increment of solution, allowing precise volume selection without additional instrumentation.

Clicks	Volume dispensed
15 clicks	0.15 ml
30 clicks	0.30 ml
45 clicks	0.45 ml
60 clicks	0.60 ml (maximum per injection)

Volume-to-mass reference by pen variant

Because all pens contain 3 ml of solution but differ in total Retatrutide content, the mass delivered per click varies by variant. The tables below serve as a reference for research dosing calculations.

Retatrutide 10 mg pen

Clicks	Mass dispensed
15 clicks	0.5 mg
30 clicks	1 mg
45 clicks	1.5 mg
60 clicks	2 mg

Retatrutide 20 mg pen

Clicks	Mass dispensed
15 clicks	1 mg
30 clicks	2 mg
45 clicks	3 mg
60 clicks	4 mg

Retatrutide 30 mg pen

Clicks	Mass dispensed
15 clicks	1.5 mg
30 clicks	3 mg
45 clicks	4.5 mg
60 clicks	6 mg

Retatrutide 40 mg pen

Clicks	Mass dispensed
15 clicks	2 mg
30 clicks	4 mg
45 clicks	6 mg
60 clicks	8 mg

Retatrutide 60 mg pen

Clicks	Mass dispensed
15 clicks	3 mg
30 clicks	6 mg
45 clicks	9 mg
60 clicks	12 mg

Handling notes

The solution is pre-dissolved and requires no preparation prior to use. For subcutaneous administration in a research context, a fresh needle should be attached for each use. The included alcohol swabs should be used to clean the intended site prior to each injection. The pen should be handled with care and kept away from excessive heat or direct light.

Storage & stability

Store the pen cool and protected from light. Avoid freezing the pre-dissolved solution. Once a needle has been attached and the pen is in active use, maintain cold-chain storage between sessions and use within a timeframe consistent with the stability data provided in the accompanying documentation.

A batch-specific Certificate of Analysis (CoA) is included with every order, confirming compound identity and purity as verified by independent third-party laboratory analysis.

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