Source comparison
MK-677 Storage Requirements: Lyophilised vs Reconstituted
MK-677 exists in two physical states before administration, and the storage requirements differ fundamentally between them. Lyophilised (freeze-dried) MK-677 arrives as a powder inside a sealed vial. This is the form supplied by facilities like Real Peptides t
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- MK-677 exists in two physical states before administration, and the storage requirements differ fundamentally between them. Lyophilised (freeze-dried) MK-677 arrives as a powder inside a sealed vial. This is the form supplied by facilities like Real Peptides that prioritise precise amino-acid sequencing. In this state, the peptide is desiccated and stabilised. Water content below 1% means molecular motion is minimal. Store lyophilised MK-677 at −20°C in a standard freezer. The cold temperature prevents oxidative degradation and maintains structural integrity for 12–24 months when stored properly.
- Once you reconstitute the powder with bacteriostatic water, everything changes. The peptide is now hydrated, mobile, and vulnerable. Refrigerate reconstituted MK-677 at 2–8°C. The standard pharmaceutical cold-chain range. And use within 28 days. Beyond that window, bacterial contamination risk increases (even with bacteriostatic water), and peptide degradation accelerates. Research from the University of California, San Francisco shows that growth hormone secretagogues lose approximately 2–5% potency per week at refrigeration temperature, with degradation accelerating sharply above 10°C.
- The biggest mistake people make when storing reconstituted peptides isn't contamination. It's leaving the vial at room temperature between doses. Even 30 minutes at 22°C begins thermal denaturation that compounds across multiple exposures.