How should peptides be stored?

Unreconstituted peptides: Store in freezer (-20°C) for long-term or refrigerator (2-8°C) for short-term. Reconstituted peptides: Always refrigerate at 2-8°C, never freeze. Most reconstituted peptides last 4-6 weeks when properly stored.

How to Store Peptides: Temperature, Shelf Life, and Reconstituted Stability

Storage Basics

Proper storage is critical for maintaining peptide potency. Peptides are proteins that can degrade when exposed to heat, light, moisture, or repeated temperature fluctuations.

DYK Data: Community reports suggest improperly stored peptides can lose 20-50% potency within weeks. Proper storage extends shelf life by months.

Before Reconstitution

Lyophilized (freeze-dried) peptides are relatively stable but still require proper storage:

Long-term (months to years): Freezer at -20°C (-4°F)
Short-term (weeks): Refrigerator at 2-8°C (36-46°F)
Keep away from light — store in original packaging or wrap in foil
Avoid moisture — keep sealed until ready to reconstitute

After Reconstitution

Once mixed with bacteriostatic water, peptides become more fragile:

Always refrigerate at 2-8°C (36-46°F)
NEVER freeze reconstituted peptides — ice crystals damage protein structure
Keep vial upright to prevent stopper contact with solution
Minimize temperature fluctuations — don't leave on counter during use

Shelf Life by Peptide

Peptide	Unreconstituted (Frozen)	Unreconstituted (Fridge)	Reconstituted
BPC-157	2+ years	6-12 months	4-6 weeks
TB-500	2+ years	6-12 months	4-6 weeks
Semaglutide	2+ years	6-12 months	6-8 weeks
CJC-1295	2+ years	6 months	3-4 weeks
Ipamorelin	2+ years	6 months	3-4 weeks

Frequently Asked Questions

Common questions about how to store peptides: temperature, shelf life, and reconstituted stability

Can I freeze reconstituted peptides?

No. Freezing reconstituted peptides causes ice crystals to form, which can damage the peptide structure and reduce effectiveness. Always refrigerate, never freeze.

My peptide was warm during shipping — is it ruined?

Lyophilized peptides can typically handle brief temperature excursions. If it was only warm for a day or two and is still in powder form, it's likely fine. Extended heat exposure may reduce potency.

How do I know if my reconstituted peptide has gone bad?

Signs of degradation include cloudiness, visible particles, unusual color, or strange odor. Clear solution that looks the same as when first mixed is typically still good.

Should I keep peptides in the main fridge or the door?

Main fridge compartment. Door shelves experience more temperature fluctuation from opening/closing. The back of a middle shelf is ideal.

Can I travel with reconstituted peptides?

Yes, but keep them cold. Use an insulated bag with ice packs. Avoid leaving in hot cars. For air travel, pack in carry-on with ice packs (TSA allows medically necessary items).