Source comparison
Unreconstituted vs Reconstituted Melanotan-2: Temperature Tolerance Comparison
Lyophilised (unreconstituted) −20°C (freezer) 25°C (room temp) 24–36 months 12–18 months Light exposure accelerates oxidation. Store in original amber vial or foil-wrapped Reconstituted in bacteriostatic water 2–8°C (refrigerator) 15°C (brief ambient exposure
This comparison does not assign a generated winner or score.
- Lyophilised (unreconstituted)
- −20°C (freezer)
- 25°C (room temp)
- 24–36 months
- 12–18 months
- Light exposure accelerates oxidation. Store in original amber vial or foil-wrapped
- Reconstituted in bacteriostatic water
- 2–8°C (refrigerator)
- 15°C (brief ambient exposure only)
- 28–30 days
- 48–72 hours
- Any excursion above 25°C for >2 hours causes irreversible peptide fragmentation
- Reconstituted in sterile water (no preservative)
- 2–8°C
- 8°C (strict)
- 7–10 days
- 24 hours
- Bacteriostatic water extends microbial stability. Sterile water does not
- Unreconstituted Melanotan-2 tolerates moderate temperature variation because molecular motion in the solid state is restricted. Reconstituted peptides exist in solution, where thermal energy directly drives bond cleavage. The differential is stark: a lyophilised vial left in a 30°C environment for a week retains near-full potency; the same vial reconstituted and exposed to 30°C for 24 hours loses 20–30% activity and begins aggregating into insoluble precipitates. This table shows why storage protocol must shift the moment bacteriostatic water enters the vial.