How long do peptides last?
A sealed, freeze-dried peptide kept cold and dry lasts far longer than the same peptide in water. Once it is in solution, the clock depends on the sequence: a few amino acids are known weak points, and some peptides carry more of them than others.
Sealed, refrigerated, and in solution.
Sealed and lyophilized: the dry powder is the stable form (see what a lyophilized peptide is). Kept sealed at 2 to 8 °C, dry and away from light, as Helion's labels direct, it suits long-term storage, and short transit at room temperature is normal for a dry solid.
In solution: much shorter, and it varies by peptide. Water lets the slow chemical reactions that degrade peptides run: deamidation, isomerization, oxidation and aggregation. Keep solutions at 2 to 8 °C, protected from light, and avoid repeated freezing and thawing.
| Form | Storage | How long |
|---|---|---|
| Sealed lyophilized vial | 2 to 8 °C, dry, dark | Long-term; the most stable form |
| Sealed vial at room temperature | Transit only | Short periods, such as shipping |
| Peptide in solution | 2 to 8 °C, dark, no repeated freezing | Much shorter; depends on the sequence |
| Opened bacteriostatic water | Room temperature, as labeled | 28 days from the first puncture (USP 797) |
Do peptides need to be refrigerated?
For storage, yes. Helion's labels call for every peptide to be kept sealed at 2 to 8 °C, dry and away from light: SS-31, MOTS-c, GHK-Cu, tesamorelin, CJC-1295 + ipamorelin and Wolverine (BPC-157 + TB-500). Once a peptide is in solution, refrigeration matters more, not less, because water is what lets the degradation reactions run. The exception in the catalog is bacteriostatic water, which is stored at room temperature.
How long can peptides be out of the fridge?
There is no single number, because it depends on the form and the sequence. A sealed, lyophilized vial is a dry solid, and short stretches at room temperature, such as the days a package spends in transit, are normal; put it in the refrigerator on arrival. A peptide in solution is far less forgiving: keep its time out of the refrigerator to a minimum, and protect it from light and heat. The table below shows which sequences carry the residues most sensitive in solution.
A few amino acids are the weak points.
Formulation reviews describe the same short list of chemical routes. Asparagine (Asn) deamidates and aspartate (Asp) isomerizes, both through the same cyclic intermediate; glutamine (Gln) deamidates too, but far more slowly. Methionine (Met), cysteine (Cys) and tryptophan (Trp) are among the residues most open to oxidation. A peptide with none of these holds up better in water than one with several.
The effect can be large. In a study of growth hormone-releasing factor analogs kept in neutral solution at 37 °C, deamidation of the asparagine at position 8 drove most of the degradation: that analog had a half-life of about 8 days, while the same peptide with serine at position 8 lasted about 65 days and kept its full activity after 14 days.
What each Helion sequence means in solution.
| Compound | Met, Cys or Trp (oxidation) | Asn, Gln or Asp (deamidation, isomerization) | Note |
|---|---|---|---|
| SS-31 | None | None | Four residues: D-Arg-Dmt-Lys-Phe-NH2 |
| MOTS-c | Met1, Trp3, Met6 | Gln4 | The most oxidation-prone sequence in the catalog |
| GHK-Cu | None | None | Gly-His-Lys held as a copper(II) complex |
| Tesamorelin | Met27 | Asn8, Asn35; Gln16, 24, 30, 31, 36; Asp3, 25 | The full 44-residue GHRH sequence |
| CJC-1295 (no DAC) | None | Gln8, 16, 24; Asp3, 25; no Asn | Its substitutions replace Asn8 with Gln and Met27 with Leu |
| Ipamorelin | None | None | Five residues: Aib-His-D-2-Nal-D-Phe-Lys-NH2 |
| BPC-157 | None | Asp10, Asp11 | No Met, Cys, Trp, Asn or Gln |
| TB-500 | None | Gln7 | Ac-LKKTETQ, seven residues |
Sequences as listed on each compound page; residues are numbered from the N-terminus. This describes chemistry in solution, not the tested stability of any lot.
Getting the most from a vial.
- Keep vials sealed and refrigerated until needed, and let a cold vial reach room temperature before opening it so moisture does not condense on the powder.
- Once a peptide is in solution, keep it at 2 to 8 °C and away from light.
- Avoid repeated freeze and thaw cycles.
- Write the date the vial went into solution on its label.
- Check the lot number on the vial against its Certificate of Analysis.
How Helion ships and labels.
Helion ships every peptide as a lyophilized powder by USPS Priority Mail, labeled for storage at 2 to 8 °C, with lot numbers that match the COA Portal. The peptide storage guide covers storage step by step, and the bacteriostatic water guide covers the diluent. Specs by compound are in the research library.
Specs and storage by compound.
Questions (11)
How long do peptides last in the fridge?
As a sealed lyophilized powder at 2 to 8 °C, kept dry and dark, a peptide is in its most stable form and suits long-term storage. In solution it lasts much less time, and how long depends on the sequence; keep solutions at 2 to 8 °C, away from light, without repeated freezing.
Do peptides expire?
Yes. Peptides degrade slowly even as a dry powder and much faster in solution, through deamidation, isomerization, oxidation and aggregation. Storage that is cold, dry and dark slows those reactions.
How long can peptides stay out of the fridge?
A sealed lyophilized vial tolerates short periods at room temperature, such as shipping. Put it in the refrigerator on arrival. Solutions should stay refrigerated.
Does BPC-157 need to be refrigerated?
Keep it at 2 to 8 °C, as Helion's labels direct for every peptide. BPC-157's sequence has no methionine, cysteine, tryptophan, asparagine or glutamine, but it does have two adjacent aspartates that can isomerize in solution.
How long does BPC-157 last?
Sealed and refrigerated as a lyophilized powder, it is in its most stable form. In solution it lasts much less time; keep it cold, away from light and free of repeated freezing. Helion supplies BPC-157 in the Wolverine (BPC-157 + TB-500) blend.
Do peptides need to be refrigerated?
Yes, for storage: Helion's labels call for 2 to 8 °C, sealed, dry and dark, for every peptide, and solutions should stay refrigerated too. Short periods at room temperature in a sealed vial, such as shipping, are normal.
Does tesamorelin need to be refrigerated?
Yes. Keep it at 2 to 8 °C as Helion's label directs, sealed or in solution. Its 44-residue sequence includes asparagines and a methionine, residues that degrade in solution.
Does GHK-Cu need to be refrigerated?
Yes, sealed at 2 to 8 °C, dry and away from light, as Helion's label directs, and refrigerated once in solution.
Does MOTS-c need to be refrigerated?
Yes. Store it sealed at 2 to 8 °C and keep solutions refrigerated and protected from light; with two methionines and a tryptophan, it is the most oxidation-prone sequence in Helion's catalog.
Does CJC-1295 need to be refrigerated?
Yes, sealed at 2 to 8 °C per Helion's label, and refrigerated once in solution. The no DAC form in Helion's blend replaces the original asparagine 8 and methionine 27 with more stable residues, but solutions still degrade faster than powder.
Which Helion peptide is most sensitive in solution?
By sequence, MOTS-c: it has two methionines and a tryptophan, among the residues most open to oxidation. Tesamorelin also carries asparagines and a methionine, while SS-31, GHK-Cu and ipamorelin have none of those residues.
Published studies (4)
- Degradation of growth hormone releasing factor analogs in neutral aqueous solution is related to deamidation of asparagine residues. Replacement of asparagine residues by serine stabilizes
- Formulation considerations for proteins susceptible to asparagine deamidation and aspartate isomerization
- Stability of protein pharmaceuticals: an update
- Applications of Freezing and Freeze-Drying in Pharmaceutical Formulations
Citations from PubMed for reference. They describe the compound in the literature, not any Helion lot, and nothing here is guidance on use.