Peptide Storage Guide

Unreconstituted peptide powder is the most stable form. Most lyophilized peptides can be stored at room temperature for weeks to months. For long-term storage (3+ months), refrigerate at 2-8°C. For very long-term storage (1+ year), freeze at -20°C. Avoid repeated freeze-thaw cycles.

Once mixed with BAC water, peptides must be refrigerated at 2-8°C (36-46°F). Label every vial with the reconstitution date.

There is no single shelf life. Across the peptides in our library, published and community storage guidance ranges from hours to several months, and the two peptides sitting next to each other in your fridge can differ by weeks. What drives it: the peptide's own chemistry, whether your water carries a preservative, temperature swings, and light exposure. Check the storage section on the compound's page rather than applying one number to everything.

Most peptides are sensitive to UV light, which can break peptide bonds and reduce potency. Store vials in a dark location in your refrigerator. If your vial is clear glass, consider wrapping it in aluminum foil. Never leave reconstituted peptides on a counter in direct sunlight.

Room temperature (15-25°C): acceptable for short-term lyophilized storage. Refrigerator (2-8°C): required for all reconstituted peptides. Freezer (-20°C): long-term lyophilized storage. Never freeze reconstituted peptides — ice crystals can damage the peptide structure.

A clear, colorless solution is normal. Watch for: cloudiness (protein aggregation), visible particles, color changes (yellowing), or unusual smell. If any of these occur, discard the vial. Degraded peptides may be ineffective or potentially harmful.

For travel, use an insulated cooler bag with ice packs for reconstituted peptides. Lyophilized (powder) vials can travel at room temperature for a day or two without concern. Keep peptides in carry-on luggage (temperature-controlled cabin) rather than checked bags (cargo hold temperatures fluctuate).