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). Most reconstituted peptides maintain potency for 3-4 weeks. Some more stable peptides (Semaglutide) may last 4-6 weeks. Label every vial with the reconstitution date.

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).