Proper storage maintains peptide stability and potency. This reference covers temperature, humidity, light, and container requirements for lyophilized and reconstituted peptides.

Lyophilized Peptides

Condition	Duration	Temperature	Notes
Short-term	<1 month	2-8°C	Refrigerated, protect from light
Long-term	1-2 years	-20°C	Frozen, desiccant required
Ultra-long	>2 years	-80°C	Flash-freeze, inert atmosphere

Reconstituted Peptides

Condition	Duration	Temperature	Notes
Working solution	<24 hours	2-8°C	Use within day
Short-term	1-2 weeks	2-8°C	BAC water required
Extended	2-4 weeks	2-8°C	Some peptides only
Frozen aliquots	3-6 months	-20°C	Single-use aliquots

Stability by Peptide Class

Class	Lyophilized Stability	Reconstituted Stability	Key Concerns
GLP-1 agonists	>2 years -20°C	2-4 weeks 2-8°C	Aggregation, deamidation
Insulins	>2 years -20°C	28 days 2-8°C	Fibrillation, potency loss
Oxytocin	>1 year -20°C	1-2 weeks 2-8°C	Cyclicization, oxidation
BPC-157	>2 years -20°C	4+ weeks 2-8°C	Highly stable
GHK-Cu	>2 years -20°C	4+ weeks 2-8°C	Copper oxidation

Best Practices

1. Never freeze reconstituted peptides (ice crystals damage structure)
2. Use BAC water (preservative prevents microbial growth)
3. Aliquot before freezing (avoid freeze-thaw cycles)
4. Protect from light (photodegradation of aromatic residues)
5. Track expiry dates (label vials with date and concentration)

Container Requirements

Container	Best For	Avoid	Notes
Borosilicate glass vials	All peptides	—	Industry standard
Type I glass	Injectable	—	Low extractables
PP centrifuge tubes	Research	Long-term storage	May leach plasticizers
Cryovials	-80°C storage	Room temperature	Screw-cap, O-ring

Humidity and Light Control

Factor	Effect on Peptides	Control Method
High humidity	Hydrolysis, microbial growth	Desiccant, sealed containers
Direct light	Photodegradation (Trp, Tyr)	Amber vials, dark storage
UV exposure	Backbone cleavage	UV-filtered lighting
Oxygen	Oxidation (Met, Cys)	Inert atmosphere (N₂/Ar)

Storage supplies available from Kingston Peptides