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Someone left a note saying their small fridge that stores research peptides went colder than it should. Most of the vials seemed fine afterward, but one peptide—BPC-157—was frozen solid while the others stayed liquid. They’re planning to throw that frozen vial away and wondered why that one froze when they were all stored together. BPC-157 is a short chain of amino acids (a peptide) that some people use experimentally for wound healing and muscle or tendon issues. It’s not an approved prescription drug; people buy it for research or off-label use. In plain terms, it’s a tiny protein fragment that’s typically stored cold to keep it stable. The other names they mentioned (Reta and GKH-Cu) are different peptides with different chemical makeups; those differences can change how they behave at low temperatures. The key point from this note is not a scientific study but an anecdote: one vial froze while others didn’t. There are a few plausible reasons. Different peptides and their formulations can have different freezing points depending on the solvent they’re dissolved in (water, saline, glycerol, bacteriostatic water) and whether any salts or stabilizers are present. A vial with more water and fewer additives will freeze first. Vial volume and how close each vial was to the coldest spot in the fridge also matter. Because this is one person’s observation, it can’t tell us how common this is or whether freezing ruins BPC-157’s effects. We lack controlled data here. For people who store peptides, the practical takeaway is to check how each product should be stored and what it’s dissolved in. Some peptides tolerate freezing and thawing better than others; some are recommended to be kept refrigerated but not frozen. If you rely on a product for research, clinical work, or personal experiments, follow the supplier’s storage instructions and consider using a monitored fridge so you catch temperature drops early. If you see a frozen vial, contact the supplier or check literature/guidance about that specific peptide before using it. Caveats: this is an anecdote, not a study. We don’t know if freezing damages BPC-157’s potency in this case. BPC-157 is not an approved medication in many places and is often unregulated when bought online; purity and formulation can vary a lot, which affects freezing behavior and safety. Don’t use anything that looks compromised, and consult a professional for medical advice. Bottom line: different peptides and solutions freeze at different temperatures, so one frozen vial amid unfrozen ones isn’t impossible—and if in doubt, toss it.
Source: r/Peptides