Temperature and light are the enemies. Follow these and your peptides hold their potency for the full shelf life. Ignore them and you degrade the product before you ever use it.
Before you mix it (lyophilized powder)
- Short-term (weeks): refrigerator, 2–8°C. Fine for anything you'll use soon.
- Long-term (months): freezer, -20°C. Lyophilized powder is stable frozen for a year or more.
- Keep it dark. Store in the original vial or a box. Light degrades peptides over time.
After you mix it (reconstituted liquid)
- Refrigerate immediately at 2–8°C. Never leave a reconstituted vial at room temperature longer than the time it takes to draw a dose.
- Do not freeze reconstituted peptides. Freezing and thawing the liquid damages the molecule.
- Use within about 28 days. Most reconstituted peptides are stable roughly four weeks refrigerated. Some are shorter — when in doubt, ask.
- Keep it away from the fridge door. The door swings in temperature every time you open it. Put your vials toward the back, on a middle shelf.
Travelling with peptides
- Under a few hours: an insulated bag with an ice pack is fine.
- Longer trips: use a small medical cooler with gel packs, and refrigerate again as soon as you arrive.
- Flying: keep them in your carry-on, never checked luggage (the hold isn't temperature-controlled). Bring them in the original vial.
When to throw it out
Cloudy liquid, floating particles, discoloration, or a vial that got left out warm for hours — discard it. Peptides are cheap enough that it's never worth injecting something you're unsure about. If a vial we sent you went bad in transit, message us and we'll replace it.