It’s completely normal for packages to feel warm during transit, especially in warmer climates or summer months. The good news is that your peptides are completely safe and stable — even if the package feels hot when it arrives.

Why Heat Isn’t a Problem

All of our research peptides, unless otherwise stated, are supplied in lyophilized (freeze-dried) form. This process removes virtually all moisture, which is the main factor that leads to peptide degradation. Without water, the molecular structure of the peptide remains stable, even under fluctuating temperatures.

Backed by Science

Research has shown that lyophilized peptides remain stable even after short-term exposure to temperatures as high as 40–45 °C (104–113 °F). Because there’s no moisture present, the peptides do not degrade under normal shipping conditions — meaning their integrity, purity, and quality remain fully intact when they reach you.

Proper Storage Once Received

When your order arrives, we recommend storing your vials in a cool, dry place or refrigerating at 2–8 °C (36–46 °F) for long-term stability. For best results, keep the vials sealed and protected from direct sunlight and humidity.

In Summary

Even if your shipment arrives warm, you can rest assured that your peptides remain completely stable and ready for research use. The lyophilized form is designed for durability, ensuring you always receive a high-quality, temperature-stable product.