Peptides are short chains of amino acids that act as tiny messengers in the body, influencing processes such as metabolism, hormone signaling, and cellular repair. In research and biotechnology, peptides like GLP-3 and GLP-2 are among the most studied compounds for their potential impact on metabolism and energy regulation.

At Sunday, our goal is to supply peptides that meet the highest purity standards, ensuring accuracy and consistency in every vial.

💜 GLP-3 (Retatrutide): The Next Generation of Peptide Research

GLP-3, scientifically known as Retatrutide, is a triple-agonist peptide that interacts with three key receptors in the body:

  • GLP-1 (Glucagon-Like Peptide-1)

  • GIP (Glucose-Dependent Insulinotropic Polypeptide)

  • Glucagon receptor (GCGR)

This unique triple action has made Retatrutide one of the most talked-about peptides in modern research. Studies explore its role in regulating glucose metabolism, improving insulin sensitivity, and supporting balanced energy usage.

Why Researchers Choose GLP-3 (Retatrutide):

  • Ultra-high purity (≥99%)

  • Reliable, stable formulation (10 mg)

  • Produced under strict laboratory standards

At Sunday, GLP-3 represents the forefront of innovation — combining purity and precision for dependable research results.

💚 GLP-2 (Tirzepatide): Dual-Agonist Precision

GLP-2, known as Tirzepatide, is a dual-agonist peptide that activates both GLP-1 and GIP receptors.
These incretin hormones are involved in the body’s natural response to nutrients, helping regulate blood sugar and energy balance.

Tirzepatide has quickly become one of the most studied compounds in peptide science due to its ability to target two major metabolic pathways simultaneously.

Key Attributes of GLP-2 (Tirzepatide):

  • Dual-receptor activity (GLP-1 and GIP)

  • High purity 15 mg formulation

  • Consistent results for research and development

Every batch of GLP-2 from Sunday is lab-verified to exceed 99% purity — ensuring every vial meets professional research standards.

💧 BAC Water: The Foundation of Peptide Stability

While GLP-3 and GLP-2 are advanced peptides, BAC Water (Bacteriostatic Water) serves as their essential companion.
It’s a sterile water solution containing 0.9% benzyl alcohol, which helps prevent bacterial growth and preserve peptide stability in laboratory environments.

Benefits of BAC Water:

  • 99%+ purity for clean, consistent results

  • 5 mL sterile glass vials

  • Ideal for peptide reconstitution and handling

When paired with Sunday peptides, BAC Water ensures maximum reliability and integrity throughout the research process.

🧬 Why Choose Sunday Peptides?

At Sunday, we focus on three principles:

  1. Purity: Every product exceeds 99% verified purity.

  2. Precision: Produced under strict quality control and scientific integrity.

  3. Performance: Consistent, dependable, and trusted by peptide researchers.

We don’t just provide peptides — we deliver confidence in every drop.