Peptide Knowledge
Straight, practical answers to the questions people actually ask about storing, stacking, injecting, and travelling with peptides.
Peptides are delicate. How you store them is the single biggest factor in whether they stay effective.
Powder: yes. Solution: not really. Lyophilised (freeze-dried) peptides can be frozen and this is the best way to store them long term — typically at -20°C, where they stay stable for a year or more. Once reconstituted, though, freezing is generally discouraged: repeated freeze-thaw cycles can break the peptide down. Keep reconstituted vials refrigerated (2–8°C), not frozen.
Heat accelerates degradation. Lyophilised powder is fairly robust and usually survives short spells at room temperature — a few days in shipping without an ice pack is normally fine — but prolonged warmth still shortens its life. Reconstituted solution is much more sensitive: leaving it warm speeds up breakdown and can reduce potency. Keep reconstituted peptides cold and out of direct light.
Reconstituted peptides: yes — 2–8°C, used within a few weeks. Unopened lyophilised powder is best kept frozen for the long term, though it tolerates refrigeration and brief room-temperature periods. Keep everything away from light and label each vial with the date.
Yes. Lyophilised peptides have a long shelf life — often two years or more kept frozen and dry — while reconstituted peptides last only weeks. Warning signs of degradation include cloudiness, discolouration, or visible particles in what should be a clear solution. When in doubt, discard it.
An unopened vial typically lasts two to three years — check the printed expiry. Once you've punctured the stopper, the pharmaceutical standard is to use it within 28 days, the multi-dose window its benzyl alcohol preservative is validated for. Keep it refrigerated after opening.
Combining compounds and choosing frequency depends on the peptides involved — here are the common questions.
They're one of the most commonly combined pairs, often stacked for recovery because their mechanisms are considered complementary — BPC-157 tends to be used more locally, TB-500 more systemically. Many people reconstitute each vial separately, then draw both into one syringe to inject together. Reconstitute and calculate the concentration and dose for each compound individually first. See the BPC-157 and TB-500 calculators.
It depends on the peptide. Short-acting compounds like growth-hormone secretagogues (ipamorelin, hexarelin) are often dosed several times a day, and BPC-157 is sometimes split into two daily doses. Long-acting compounds — weekly GLP-1s, or CJC-1295 with DAC — are not injected twice daily. Match frequency to the compound's half-life and your protocol.
The practical side of administration — needles, sites, and route.
Most people inject subcutaneously with an insulin syringe and a fine 29–31 gauge needle, usually 8mm (5/16") or 12.7mm (1/2") long. Higher gauge number = thinner needle = less sensation. Some draw bacteriostatic water with a slightly larger-bore needle and switch to the fine one to inject, but a standard insulin syringe handles both jobs for most protocols.
The large majority of peptides go subcutaneous — into the fat layer, usually of the abdomen — because it's simpler, less painful, and absorbs well for most compounds. Intramuscular is used less often, for specific compounds or preferences. GH secretagogues and GLP-1s are almost always subcutaneous; BPC-157 is sometimes injected subcutaneously near an area of interest.
No — they're single-use. Insulin needles are extremely fine and go blunt after one injection, making reuse more painful and raising the risk of infection and site irritation. Use a fresh sterile needle every time and dispose of used ones in a sharps container.
Taking peptides with you takes a little planning, mostly around temperature and local law.
The scanners don't harm peptides — X-ray screening of hand luggage is fine. The real challenges are temperature and legality. Reconstituted peptides need to stay cool, so most people carry them in hand luggage in an insulated bag with a cold pack rather than risk a hot or freezing hold. Needles and bacteriostatic water are generally permitted with medication, subject to each airport's liquid and sharps rules. The bigger issue is legal status: peptides are regulated differently country to country, so check the laws of both your departure and destination before you travel.
For informational purposes only. The compounds discussed are research chemicals, not licensed medicines. Nothing here is medical advice, and answers reflect commonly reported practice rather than clinical guidance. Storage times, legality, and handling vary — always verify against your product's labelling and the laws in your jurisdiction, and consult a qualified healthcare professional before making any decisions.
Peptidy tracks your injections, stores your vial concentrations, and includes free reconstitution calculators for 17 compounds.