Heat and light degrade peptides far faster than time does. Here is how to store them before and after reconstitution.
Peptides degrade through heat and light far more than through time on a shelf.
Storage is mostly about keeping those two under control.
Before reconstitution
Lyophilised powder is the stable form. It survives shipping at ambient temperature, which is
why vials arrive without cold packs. For anything longer than transit, refrigerate at
2–8°C and keep vials in their packaging, out of light.
For long-term storage, freezing the powder is standard practice. Let the vial return to room
temperature before adding water.
Need the vials?28 compounds in Australian stock, dispatched within 24 hours.
Refrigerate, never freeze. Once a peptide is in solution, freeze-thaw cycles
cause real degradation. A reconstituted vial belongs in the fridge at 2–8°C.
The practical limit on a reconstituted vial is usually the bacteriostatic water rather than the
peptide, manufacturers typically state 28 days once the stopper is pierced.
State
Storage
Notes
Sealed powder, short term
Room temperature
Fine for transit and days, not months
Sealed powder, ongoing
2–8°C, dark
Keep in packaging
Sealed powder, long term
Frozen
Warm to room temp before mixing
Reconstituted
2–8°C
Do not freeze
Bacteriostatic water
Room temperature, not the fridge
Below 25°C, out of light. Typically 28 days once pierced
Bacteriostatic water
Don't keep bac water in the fridge. Store the bottle at room temperature, below
25°C and out of direct light. Cold bac water can make peptides go cloudy or gel-like when you
mix them. Only the mixed peptide vial goes in the fridge.
Handling that shortens shelf life
Repeated warming. Take out what you need and return the vial to the fridge
rather than leaving it on a bench.
Direct light. Keep vials boxed.
Contaminated draws. Wipe the stopper every time and use a fresh syringe.
Common questions
Do peptides need to be refrigerated before mixing?
Lyophilised (freeze-dried) vials are stable at room temperature for short periods, which is why they survive shipping. For anything beyond that, refrigerate at 2–8°C, away from light.
How should I store a vial after reconstitution?
Refrigerated at 2–8°C. Do not freeze a reconstituted vial, freeze-thaw cycles degrade peptides in solution.
Can I freeze the powder?
Lyophilised powder tolerates freezing well and that is how long-term stocks are typically held. Let it return to room temperature before adding water.
How long does a reconstituted vial last?
It depends on the compound and the storage conditions. Bacteriostatic water is preserved for about 28 days once pierced, which is generally the limiting factor.
Do I store bac water in the fridge?
No. Keep your bacteriostatic water at room temperature, below 25°C and out of direct light. Cold bac water can make peptides go cloudy or gel-like when you mix them. Once a peptide has been mixed, that vial does go in the fridge.
Does light matter?
Yes. Keep vials in their box or otherwise out of direct light. Most degradation comes from heat and light rather than time alone.
My vial arrived warm, is it ruined?
Lyophilised powder is robust in transit and short periods at ambient temperature are expected. If anything looks visibly wrong, discoloured powder, a cracked vial, a lifted stopper, contact us before using it.
Still stuck?
Message the team on Telegram and we will sort it out, usually within minutes.
For research use only. Everything on this page describes laboratory handling of research materials: volumes, concentrations, storage and shipping. It is not medical advice, not a dosing recommendation, and not a claim of any effect in humans. Evra Peptides products are not for human or veterinary consumption, nor for diagnostic or therapeutic use. You must be 18 or over to order.
