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How to store peptides
Approved peptide medicines come with a storage rule on the label. Some are kept in a fridge, some at room temperature, and several say never to freeze. A vial with no approved label has no tested shelf life, before or after mixing. This page shows what the labels say and where the gaps are.
What holds for most vials
- Follow the label if there is one. It is the only storage rule that was tested on that product.
- Where there is no label, a mixed vial is usually kept in the fridge, upright, away from the freezer plate.
- Keep it out of light.
- Write the mixing date on the vial.
- Do not use liquid that has turned cloudy, changed colour or has bits in it.
What the approved labels say
Only approved products have a tested storage rule. These are the ones on this site, in the label's own terms.
| Peptide | What the label says | Source |
|---|---|---|
| Tirzepatide | Zepbound (US): refrigerate at 2 to 8 C (36 to 46 F) in the original carton. Do not freeze. Protect from heat and light. A single-dose pen or vial may be kept unrefrigerated, at no more than 30 C (86 F), for up to 21 days in total. | Label |
| Semaglutide | Wegovy injection (US): refrigerate single-dose pens and syringes at 2 to 8 C (36 to 46 F). Do not freeze, and do not use it if it has been frozen. Before the cap is removed a pen can be kept at 8 to 30 C (46 to 86 F) for up to 28 days. Protect from light. | Label |
| Tesamorelin | Egrifta SV: store the unmixed 2 mg vials at room temperature (20 to 25 C per the label), in the original box away from light. Use straight after mixing; do not freeze or refrigerate the mixed solution. | Label |
| Tesamorelin | Egrifta SV after mixing: use at once and throw away what is left. | Label |
| Tesamorelin | Egrifta WR: store the vial at room temperature (20 to 25 C per the label) in the original box. One mixed vial covers 7 daily doses and is kept at room temperature; discard what is left 7 days after mixing; do not freeze. | Label |
| Tesamorelin | Original Egrifta 1 mg vials (2010 label): unmixed vials had to be kept in the refrigerator (2 to 8 C per the label) and protected from light. | Label |
| SS-31 (elamipretide) | Refrigerate at 2 to 8 degrees C (36 to 46 degrees F). Do not freeze. After the first dose an opened vial can be kept in the refrigerator or at room temperature, 20 to 25 degrees C (68 to 77 degrees F). Discard vials 8 days after first opening. | Label |
| PT-141 (bremelanotide) | Store at or below 25 C (77 F). Do not freeze. Protect from light. | Label |
| Gonadorelin | Unopened Lutrepulse vials and diluent: room temperature, 15 to 30 C. | Label |
| Thymosin Alpha-1 | Italian label: store in a refrigerator at 2 to 8 degrees C. Once reconstituted with the supplied solvent, use once and within 24 hours and discard what is left. | Label |
| HGH | Humatrope (US): refrigerate cartridges and diluent at 2 to 8 C (36 to 46 F) and keep them in the carton, away from light. A reconstituted cartridge keeps for up to 28 days in the refrigerator and should not be frozen. | Label |
| HCG | Novarel (US): store the dry vial at room temperature, 20 to 25 C (68 to 77 F). After mixing with bacteriostatic water, refrigerate at 2 to 8 C (36 to 46 F) and use within 30 days. The Pregnyl label allows 60 days refrigerated after mixing and says not to freeze. | Label |
| HMG | Menopur (US): the dry powder may be kept in the refrigerator or at room temperature, 3 to 25 C (37 to 77 F), away from light. Use it straight after mixing and throw away what is left. | Label |
Vials with no label
For a peptide that is not an approved medicine, nobody has published how long that product keeps, dry or mixed. Figures passed around online for these vials are not from stability testing of the product in your hand.
This site does not print a number of days for them. A missing number is more honest than an invented one.
Questions
Can a mixed vial be frozen?
Several of the approved labels in the table on this page say not to freeze. For vials without a label there is no tested answer.
Does a dry vial need the fridge?
Follow the label or the maker's instructions. Approved products that ship as a dry powder state their own temperature range.
How long does a mixed vial last?
For an approved product, the label says. For anything else, no tested figure exists.
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DosageFacts is an information site. It is not medical advice. Talk to a licensed professional before using any medication.