Who this guide is for
This guide is for men who keep any injectable or hormone medicine at home: testosterone, HCG, a compounded peptide, or a GLP-1 such as semaglutide or tirzepatide. Each of these has its own storage rule, and the rules do not match. Testosterone dislikes the cold, mixed HCG needs it, and GLP-1 pens come with a countdown once they leave the fridge.
The single most useful habit is simple: the label on your product wins. The tables below summarize what the official labels say as of October 2026, but if your box or pharmacy label says something different, follow that and ask us about the difference.
The rules at a glance
| Product | Before opening or mixing | Once opened or mixed | How long it lasts |
|---|---|---|---|
| Testosterone cypionate vial | Room temperature, 68°F to 77°F, protected from light | Same | Ask your clinician about in-use dating for your vial |
| Kyzatrex capsules | Room temperature, dry place | Same | Until the expiry date |
| HCG (Pregnyl) | Room temperature, 59°F to 77°F | Refrigerator, 36°F to 46°F | Discard 60 days after mixing |
| Compounded peptides | As the pharmacy label says, often refrigerated | Usually refrigerated after mixing | The pharmacy’s beyond-use date |
| Semaglutide single-dose pen (Wegovy) | Refrigerator | Single use | Discard after 28 days out of the fridge, or if exposed above 86°F |
| Semaglutide multi-dose pen (Wegovy FlexTouch) | Refrigerator | Room temperature 59°F to 86°F or fridge | 56 days after first use |
| Tirzepatide single-dose pen or vial (Zepbound) | Refrigerator | Single use | Up to 21 days total out of the fridge, below 86°F |
| Tirzepatide multi-dose vial or KwikPen (Zepbound) | Refrigerator | Fridge or room temperature up to 86°F | 30 days after first use, or 4 weekly doses |
| Compounded GLP-1 multi-dose vial | As labeled | As labeled | Discard 28 days after first use |
Testosterone: room temperature, out of the light
Injectable testosterone is the easy one. The Depo-Testosterone label calls for storage at 68°F to 77°F and protection from light. Keep the vial in its box, in a cupboard or drawer, away from the stove and the bathroom.
Cold is the main mistake. Testosterone is dissolved in oil, and the label notes that crystals can form when the vial is stored below the recommended temperature; warming it and shaking it should redissolve them. A vial left overnight in a cold car usually recovers that way, but one with crystals that will not dissolve, or with cloudiness that does not clear, should not be used. Our page on whether testosterone needs refrigeration covers this in more detail, and the one on how long a testosterone vial lasts explains in-use dating.
Oral testosterone has its own simple rule. The Kyzatrex label says to store capsules at 68°F to 77°F, with short excursions between 59°F and 86°F allowed, in a dry place away from humidity.
Mixed peptides and HCG: into the fridge
Anything that starts as a powder changes rules the moment it is mixed. The Pregnyl label stores the unopened powder at 59°F to 77°F, then calls for the mixed solution to be refrigerated at 36°F to 46°F and thrown away after 60 days. Our guide on how to mix and inject HCG walks through that vial step by step.
Compounded peptides follow the pharmacy’s instructions, which usually mean refrigeration after mixing and a beyond-use date printed on the label. Where no shorter date is given, the FDA’s general advice is that vials holding multiple doses of a sterile medicine be used within 28 days of first use. Tesamorelin is the exception that proves the rule: its approved forms are stored at room temperature, and one must be used right after mixing. Our guide to reconstituting peptides explains why labels differ.
For every mixed vial:
- Write the mixing date and the discard date on the vial or a strip of tape.
- Store it upright in the main body of the fridge, not the door, where temperatures swing.
- Keep it away from the back wall and the cooling element, where things can freeze.
- Throw it out on the discard date even if liquid is left.
GLP-1 pens and vials: count the days
GLP-1 medicines are refrigerated before use, and what happens next depends on the device. The Wegovy label says to throw away a single-dose pen that has been frozen, exposed to light or temperatures above 86°F, or out of the refrigerator for 28 days or longer. Its multi-dose FlexTouch pen can be kept at 59°F to 86°F or in the fridge for 56 days after first use. Wegovy tablets, by contrast, are kept at room temperature.
Tirzepatide has two sets of limits. The Zepbound label allows each single-dose pen or vial up to 21 days in total unrefrigerated at no more than 86°F. Its multi-dose vial and KwikPen are thrown away after 30 days at room temperature, 30 days after first use, or after four weekly doses, whichever comes first, even if medicine remains.
Compounded semaglutide or tirzepatide usually comes in a multi-dose vial. The FDA’s page on unapproved GLP-1 drugs tells patients to discard such a vial within 28 days after the first use, even if medication remains, and to use a new sterile needle and syringe for each dose. Our article on compounded GLP-1 rules explains where compounding stands in 2026.
A practical trick: when a pen or vial first leaves the fridge, write that date on it. Counting days from memory is how pens end up used past their limit.
Fridge setup, travel and warning signs
A home setup checklist
- A small fridge thermometer on the middle shelf, checked now and then
- A labeled box or bin so medicines do not get buried behind food
- Nothing stored in the door or touching the back wall
- Room-temperature products in a cool, dry drawer, out of sight and reach of children
- A sharps container nearby for used syringes and pen needles
Traveling
Keep medicines in your carry-on, never in checked bags or a parked car. A parked car in a Southern California summer can quickly climb past the 86°F ceiling printed on GLP-1 labels. An insulated pouch with a cold pack works for refrigerated items over a day, as long as the pack does not touch the vial or pen directly. Our guide to traveling with testosterone covers airport screening and paperwork.
When to call
Call the clinic at 626-319-5261 before your next dose if:
- A product was frozen, left in heat or stored past its date
- Liquid that should be clear looks cloudy, has particles or has changed color
- Crystals in a testosterone vial will not dissolve after warming
- You are unsure whether a vial or pen is still within its limit
Call 911 for swelling of the face, lips or throat, hives with trouble breathing, chest pain, or fainting after any injection.
How Ultimate Male helps you store your medicines
In our peptide therapy program at San Gabriel and Downey, storage is part of the lesson where you learn your first injection, so you leave knowing how your exact product is kept and when it expires. Testosterone, HCG and GLP-1 plans work the same way: your provider explains which rule applies, the discard date and what to do if something goes wrong at home or on the road.
Peptides can be shipped to you or held at the clinic if your fridge situation is not ideal, for example during a move or a long trip. If you are unsure whether something you already have is still good, bring it or a photo of its label to your next visit, or ask on the free 10-minute call at 626-319-5261.
