How to Store Research Peptides | Temperature, Light, Long-Term Storage
QSC · RESEARCH CATALOG
How to Store Research Peptides Lyophilized Storage · Reconstituted Storage · Temperature Guide · Light Protection
Peptide storage requirements depend on whether the peptide is lyophilized (dry powder) or reconstituted (in solution). Lyophilized peptides are far more stable and forgiving of temperature variation. Reconstituted peptides are more vulnerable and have shorter stability windows.
Peptide storage requirements depend on whether the peptide is lyophilized (dry powder) or reconstituted (in solution). Lyophilized peptides are far more stable and forgiving of temperature variation. Reconstituted peptides are more vulnerable and have shorter stability windows.
Lyophilized (Unreconstituted) Peptide Storage
Long-term (1-3 years): −20°C, sealed vial, dark storage. This is the recommended default for all QSC peptides before use. Medium-term (3-6 months): 4°C (standard refrigerator), protected from light. Short-term (up to 4 weeks): room temperature in a dark, dry location is acceptable for most peptides. Avoid: direct sunlight, humidity, frequent temperature cycling.
Reconstituted Peptide Storage
After reconstitution with bacteriostatic water: store at 4°C, use within 30 days. After reconstitution with sterile water (no preservative): use within 24-48 hours. For long-term reconstituted storage: aliquot into individual-dose amounts, seal, freeze at −20°C or −80°C. Thaw only what you need — do not refreeze.
Compound-Specific Storage Notes
GHK-Cu: sensitive to oxidation — store at −20°C or lower. Use amber vials or cover with foil. Semaglutide/Tirzepatide (GLP-1 class): −20°C recommended; these are larger, more complex molecules. Oxytocin: −20°C, avoid light. BPC-157: very stable — refrigerator or room temperature for lyophilized is acceptable. Epitalon: standard −20°C for lyophilized. MOTS-c/SS-31: −20°C, protect from light.
Freeze-Thaw Cycles
Repeated freeze-thaw cycles progressively degrade peptide integrity — particularly for reconstituted solutions. Each freeze-thaw cycle can cause peptide aggregation and partial hydrolysis of peptide bonds. Best practice: aliquot reconstituted peptide into single-use volumes before freezing. For lyophilized vials: multiple temperature cycles are much less damaging than for solutions.
Frequently Asked Questions
Does temperature affect peptide purity?
Yes — elevated temperature and moisture are the primary degradation vectors for research peptides. Lyophilized peptides stored at −20°C with desiccant are stable for 2-3 years. The same peptide stored at room temperature loses purity faster — especially in humid environments. QSC supplies all peptides lyophilized for maximum stability.
Can research peptides be shipped at room temperature?
Lyophilized peptides can be shipped at ambient temperature for up to 5-7 days without significant purity loss. Longer shipping or high heat environments (summer, tropical climates) benefit from cold packs. QSC ships lyophilized peptides with appropriate packaging for US domestic delivery. Research use only.
Do I need to keep peptides in the dark?
Light (especially UV) can degrade some peptides — particularly those containing tryptophan (GHRP-6, Hexarelin, GHRP-2), tyrosine, or copper chelates (GHK-Cu). Standard practice: store vials in a dark drawer or box, or wrapped in foil. QSC supplies peptides in amber or UV-protective vials for light-sensitive compounds.
Research Use Only: All QSC products sold strictly for in vitro laboratory research. Not for human or veterinary use. Information on this page is educational and does not constitute medical advice.
