How to store peptides

Before mixing (powder)

• Short term (weeks): fridge, 2–8 °C.
• Long term (months): freezer, −20 °C.
• Keep vials in their box, away from light.
• Let a frozen vial reach room temperature before opening, so moisture doesn't condense inside.

After mixing

• Fridge only, 2–8 °C. Never freeze a mixed vial; freezing and thawing damages peptides.
• Use it within about 3–4 weeks.
• Keep it upright, capped and in the dark.

Signs it's gone bad

• Cloudiness or floating particles.
• A color change.
• It was left warm for a long time, for example in a hot car.

When in doubt, throw it out. A new vial costs less than an infection.

Travelling

Use a small insulated case with a cold pack, keep vials out of direct contact with ice, and carry them in your hand luggage, never in a hot car.

Common questions