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Alves JC, Santos AM, Jorge PI
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Sterile water: 5-7 day shelf life maximum Why sterile water has shorter shelf life: No preservatives (no benzyl alcohol) Bacteria can multiply freely if contaminated Higher contamination risk Designed for single-use vials Should only use for immediate injection (pharma standard) Shelf life with sterile water: Days 1-3: 95-100% potency, low contamination risk Days 4-5: 90-95% potency, moderate risk Days 6-7: 85-90% potency, higher risk Days 8+: Not recommended, high contamination risk When to use sterile water: Single-dose vials (use entire vial immediately) Don't have bacteriostatic water available Allergic to benzyl alcohol (rare) Pharmaceutical peptides intended for single use Why bacteriostatic is better: 4x longer shelf life (28 days vs 7 days) Much safer for multi-dose vials Standard in research peptide community Allows reconstituting full vial, using over weeks Converting to bacteriostatic: If you have sterile water, get bacteriostatic water Reconstitute with bacteriostatic for standard shelf life Small investment for much better results Never freeze reconstituted peptides Why freezing liquid peptides is bad: Ice crystals form during freezing Ice crystals physically damage peptide structure Peptides denature (unfold) during freeze Aggregation occurs when thawed Significant potency loss (30-50%+) Can make peptide completely inactive The myth: Some people think freezing = preserving True for lyophilized powder (no water) False for reconstituted liquid (water present) Water freezing is the problem If you accidentally froze reconstituted: Likely 50-70% potency loss May still have some effect Visual inspection: Cloudiness or particles = bad If clear after thawing, might work partially Better to discard and reconstitute fresh Proper long-term storage: Keep peptides as lyophilized powder frozen Reconstitute only what you'll use in 30 days Don't reconstitute entire supply at once Plan doses based on 30-day window Use our free peptide calculator at SeekPeptides to calculate how much to reconstitute for your protocol duration
Our injection timing guide covers additional tips for comfortable injections
In response, Koniver began offering a peptide that differed by a single amino acid
