How to Store Peptides: Fridge, Freezing, Light, and Shelf Life
Store a peptide the way its product label says. The FDA-approved GLP-1 pens Ozempic, Wegovy, and Zepbound are kept in the fridge at 2 to 8 degrees Celsius (36 to 46 degrees Fahrenheit), in the carton, away from light, and are never frozen. Each has its own room-temperature allowance. Research peptides have no FDA label, so no storage time is validated.[1][2][3]
Do peptides need to be refrigerated?
It depends on the product, so the label decides, not the word peptide. The Ozempic pen is stored in a refrigerator at 2 to 8 degrees Celsius before first use, and it must be kept in its original carton until it is used.[1] Wegovy single-dose pens and syringes use the same range, and Zepbound single-dose pens and vials do too.[2][3] Not every peptide is stored cold. The Egrifta WR dry vial, a tesamorelin powder, is labeled for room temperature, 20 to 25 degrees Celsius, in its original box to protect it from light.[4] Bacteriostatic water, the usual diluent, is also stored at room temperature.[5] Once a dry powder is mixed, the rules change again, and the label for that product sets them. Egrifta WR must be discarded 7 days after mixing.[4] If you cannot find a label for your product, ask a pharmacist and do not copy another product's storage rules.
How long can Ozempic, Wegovy, or Zepbound stay out of the fridge?
Each label sets its own window. After first use, an Ozempic pen can be kept for 56 days at room temperature, 15 to 30 degrees Celsius, or in the fridge, and it should be protected from excessive heat and sunlight.[1] A Wegovy single-dose pen or syringe can be kept at 8 to 30 degrees Celsius for up to 28 days if needed, before the cap is removed. The label says to throw it away if it has been frozen, exposed to light or temperatures above 30 degrees, or out of the fridge for 28 days or longer.[2] A Zepbound single-dose pen or vial can be stored at up to 30 degrees for a total of 21 days, then discarded.[3] The FDA also advises against using an injectable GLP-1 drug that arrives warm.[7] These windows are for those products only. They do not carry over to any other peptide.
| Product and state | Before first use | After first use or mixing | Room-temperature allowance | Freeze? |
|---|---|---|---|---|
| Ozempic multi-dose pen | 2 to 8 C, in the carton | 56 days at 15 to 30 C or 2 to 8 C[1] | Covered by the 56 days | No; do not use if frozen[1] |
| Wegovy single-dose pen or syringe | 2 to 8 C, in the carton, protect from light | Single use; discard after use | Up to 28 days at 8 to 30 C before cap removal[2] | No; do not use if frozen[2] |
| Zepbound single-dose pen or vial | 2 to 8 C, in the carton | Single use; discard | Up to 21 days in total at up to 30 C[3] | No; do not use if frozen[3] |
| Zepbound multi-dose vial or KwikPen | 2 to 8 C until expiry; discard after 30 days if kept at room temperature | Discard 30 days after first use or after 4 weekly doses[3] | Up to 30 C, within those limits | No[3] |
| Egrifta WR (dry tesamorelin vial) | 20 to 25 C, original box, protect from light | Discard unused solution 7 days after mixing[4] | Label storage is room temperature | Do not freeze the mixed solution or the diluent box[4] |
| Bacteriostatic water | 20 to 25 C[5] | CDC: discard within 28 days of first puncture unless the maker says otherwise[6] | Label storage is room temperature | Not stated on the label we checked |
| Research peptide vial with no FDA label | No validated label condition | No validated figure | Unknown | Unknown |
Can you freeze peptides?
Not the approved GLP-1 injections. The Ozempic label says do not freeze it and do not use it if it has been frozen, and it says not to store it in the freezer or directly beside the cooling element of the fridge.[1] The Wegovy label says the same and adds that it must be discarded if frozen.[2] The Zepbound label says do not freeze it and do not use it if frozen.[3] The Egrifta WR label also says do not freeze its injection box, which holds the diluent.[4] Freezing a solution is not harmless just because a product is a peptide. Storage advice for dry research peptides has no FDA label behind it, and this page does not print a freezer shelf-life number, because we found no validated source for one. If a pen or vial you own has frozen, the labels say to discard it. Ask a pharmacist about a replacement.
How should lyophilized (dry) peptide vials be stored?
Follow the label of the product. The one approved example we checked, Egrifta WR, says to store its 11.6 mg dry vial at room temperature, 20 to 25 degrees Celsius, in the original box to protect it from light, with excursions allowed to 15 to 30 degrees.[4] Stability reviews treat the dry state and a water solution as separate formulation problems, and describe peptide and protein breakdown as chemical and physical instability.[8] That helps explain why powders and solutions have different rules on a label. For a vial that has no FDA label, evidence for home storage times is thin. We found no validated source, so we give no number. Treat any claim about how many months a research powder lasts as unproven unless it cites a document that tested that exact product. Check the date on the vial, keep it away from heat, and ask a pharmacist for storage advice.
How long does a reconstituted peptide last?
Labels give short, product-specific limits. For Egrifta WR, the label says to discard unused solution 7 days after mixing.[4] An opened Zepbound multi-dose vial or KwikPen is thrown away after a total of 30 days at room temperature, 30 days after first use, or after 4 weekly doses, even if medicine is left.[3] The bacteriostatic water label says not to store reconstituted solutions of drugs for injection unless the drug's manufacturer directs it.[5] No validated number exists for peptides that have no FDA approval. The FDA says compounded drugs are not FDA-approved and has warned about products falsely labeled for research purposes, so such vials carry no approved discard date.[7] The CDC adds that a multi-dose vial should be dated when it is first punctured and discarded within 28 days unless the manufacturer states another date.[6] Write the mixing date on the vial.
What damages peptides in storage?
Labels point to four things: heat, light, freezing, and time. The Ozempic label says to protect the pen from excessive heat and sunlight, the Wegovy label says to protect it from light, and the Zepbound label says to protect it from heat and light.[1][2][3] Freezing is on the do-not list for all three. Stability reviews describe the underlying processes as chemical and physical instability, which is why a product's labeled limits are tested for that exact formulation and not guessed.[8] A different kind of damage is contamination. Each puncture of a multi-dose vial is a chance to introduce bacteria, and the CDC says to use a new sterile needle and syringe for every entry and to discard an opened multi-dose vial within 28 days unless the manufacturer states another date.[6] The Ozempic label also says to remove the needle after each injection and store the pen without a needle attached.[1]
How do you travel with peptide pens or vials?
Use the room-temperature window on your label as the limit, and plan the trip around it. Keep the product in its original carton, because the Ozempic, Wegovy, and Zepbound labels all call for the carton to protect it from light.[1][2][3] Avoid heat, and avoid freezing, which the labels forbid. That means a pen should not sit in a hot car or touch ice directly. The FDA advises against using an injectable GLP-1 that arrives warm, so a product that has been too warm for too long is a question for your pharmacist.[7] Carry used needles safely. The FDA says used sharps should go straight into a sharps disposal container, so bring a portable one or plan where you will dispose of them.[9] This page does not cover airline or airport rules. Check the current policy of your airline and ask your pharmacist about carrying medicine.
Frequently asked questions
I left my pen out overnight. Is it still good?
Compare how long and how warm it was against your label's room-temperature window, such as 56 days for an opened Ozempic pen. If it was longer or hotter, or you are unsure, ask a pharmacist.
Can I store pens in the fridge door?
The Ozempic label says not to store it in the freezer or directly beside the cooling element. The labels we checked say nothing about the door, so this page makes no claim about it.
Does light matter?
Yes. The Ozempic, Wegovy, Zepbound, and Egrifta WR labels all say to protect the product from light, and the Wegovy, Zepbound, and Ozempic labels say to keep it in the original carton.
How long does reconstituted BPC-157 last?
There is no FDA label and no validated figure, and the FDA lists safety concerns for compounded BPC-157. This page does not give a number. Ask a pharmacist, and do not rely on vendor charts.
Should I store a pen with the needle on?
No. The Ozempic label says to remove and safely discard the needle after each injection and to store the pen without a needle attached. Always use a new needle for each injection.
How do I know how many days a vial will last me?
Divide the doses left in the vial by your dosing interval. PepTrac's Track tab shows fill level and days left per vial from your logged doses. That is supply, not shelf life.
Sources
- DailyMed, National Library of Medicine (Novo Nordisk). Ozempic (semaglutide) injection prescribing information. Accessed October 3, 2026.
- DailyMed, National Library of Medicine (Novo Nordisk). Wegovy (semaglutide) prescribing information. Accessed October 3, 2026.
- DailyMed, National Library of Medicine (Eli Lilly). Zepbound (tirzepatide) prescribing information. Accessed October 3, 2026.
- DailyMed, National Library of Medicine (Theratechnologies). Egrifta WR (tesamorelin) prescribing information. Accessed October 3, 2026.
- DailyMed, National Library of Medicine (Hospira, Inc.). Bacteriostatic Water for Injection, USP. Accessed October 3, 2026.
- Centers for Disease Control and Prevention. Clinical Safety: Preventing Unsafe Injection Practices. Accessed October 3, 2026.
- U.S. Food and Drug Administration. FDA's Concerns with Unapproved GLP-1 Drugs Used for Weight Loss. Accessed October 3, 2026.
- Pharmaceutical Research (PubMed). Manning et al., Stability of protein pharmaceuticals: an update (2010). Accessed October 3, 2026.
- U.S. Food and Drug Administration. Safely Using Sharps (Needles and Syringes) at Home, at Work and on Travel. Accessed October 3, 2026.
Written and maintained by the team that builds PepTrac. Every calculator on this site runs the same tested math as the app. Read how we research, cite, and update pages in our editorial policy.
