Weight loss peptide pre-filled injection pen. Triple agonist of GLP-1, GIP and glucagon receptors — German-made precision in every dose.
Sleek clinical-grade pen with calibrated 40mg delivery — four clear 10mg doses in one pre-filled unit.
Retail packaging and FastPen together — transparent labeling, German manufacture, ready for professional protocols.
Why FastPen
Clinical-grade peptide delivery designed for clarity, consistency, and everyday protocol support.
Triple-agonist pathway engages GLP-1, GIP and glucagon receptors for multi-route metabolic action.
One pre-filled pen delivers four calibrated 10mg doses — less prep, more confidence.
Sleek FastPen® hardware with pharmaceutical packaging built for professional presentation.
Formulated and finished under Zytha Labs standards — Made in Germany.
Product format
Every FastPen unit is specified for transparency — format, contents, and origin at a glance.
Science
Retatrutide engages GLP-1, GIP and glucagon receptors — a multi-pathway approach to metabolic support that mirrors modern peptide science.
Outcomes
From energy and clarity to recovery support — FastPen® is designed around how professionals and informed users actually work.
#ZythaLabs
Feedback from clinics and customers who value precision packaging and reliable FastPen delivery.
The FastPen format is exactly what we needed — clear dosing, professional packaging, and zero confusion for patients starting a peptide protocol.
Impeccable presentation and fast fulfilment. The Retatrutide pen feels clinical-grade — German manufacturing shows in every detail.
We switched to Zytha Labs FastPen for consistency. Label clarity, dose structure, and support have been excellent across reorders.
Ready to order
Retatrutide 40mg — 1 pre-filled pen of 4 × 10mg doses. Made in Germany by Zytha Labs.
