Peptide storage 101 — freezer, fridge, or room temp?

Storage conditions significantly impact peptide longevity and effectiveness. Understanding proper storage is fundamental to research quality.

Lyophilized (powder) peptides:
Freezer storage (-20°C) is ideal for long-term storage. Most peptides remain stable for 1-2 years. Fridge storage works for a few months. Room temperature is acceptable for a couple weeks but is not recommended long-term.

Reconstituted peptides:
Refrigeration (2-8°C) is always required. Never freeze reconstituted peptides — the freeze-thaw cycle damages peptide bonds. Most reconstituted peptides remain good for 3-4 weeks in the fridge, though stability varies by peptide (some, like BPC-157, are more stable than others).

General storage rules:
Keep away from light (especially direct sunlight). Avoid repeated temperature swings. Use bacteriostatic water for reconstitution if using over multiple days. Label everything with the reconstitution date.

These simple practices dramatically extend peptide lifespan and preserve research quality.