Source comparison
MK-677 Solution Comparison: Quality Indicators
Clarity Clear, transparent liquid with no haze Cloudy, milky, or translucent. Light diffuses through the solution Cloudiness indicates incomplete dissolution, contamination, or peptide aggregation. All render the solution unusable Colour Colourless to very fai
This comparison does not assign a generated winner or score.
- Clarity
- Clear, transparent liquid with no haze
- Cloudy, milky, or translucent. Light diffuses through the solution
- Cloudiness indicates incomplete dissolution, contamination, or peptide aggregation. All render the solution unusable
- Colour
- Colourless to very faint straw yellow (pale, not vivid)
- Amber, orange, brown, or any colour darker than diluted apple juice
- Oxidative degradation. Peptide structure compromised, potency cannot be verified
- Particulates
- None visible when held against white background under direct light
- Any visible particles: white flecks, dark specks, fibrous strands
- Particulates = contamination or aggregation. Discard the vial
- Uniformity
- Homogeneous throughout. No layering, separation, or sediment after sitting
- Sediment layer at bottom, visible separation into phases, or concentration gradient
- Precipitation indicates improper reconstitution pH, temperature error, or mechanical damage during mixing
- Viscosity
- Flows smoothly when vial is tilted. Slightly thicker when refrigerated but still pourable
- Gel-like consistency, unusually thick, or does not flow when tilted
- Excessive viscosity suggests microbial contamination or use of incorrect diluent (not bacteriostatic water)
- Stability Over Time
- Appearance unchanged after 28 days refrigerated storage at 2–8°C
- Progressive darkening, cloudiness developing over days, or sediment forming during storage
- Time-dependent changes indicate ongoing degradation. Peptide half-life shortening, accurate dosing no longer possible