Source comparison
TB-500 Gone Bad Degraded: Storage vs Handling Comparison
Optimal Storage Temperature −20°C (freezer) 2–8°C (refrigerator) Any excursion above 8°C accelerates denaturation exponentially Temperature control is the single most critical variable—refrigeration failure is non-negotiable grounds for disposal Stability Wind
This comparison does not assign a generated winner or score.
- Optimal Storage Temperature
- −20°C (freezer)
- 2–8°C (refrigerator)
- Any excursion above 8°C accelerates denaturation exponentially
- Temperature control is the single most critical variable—refrigeration failure is non-negotiable grounds for disposal
- Stability Window
- 12–24 months at −20°C
- 28 days at 2–8°C
- Reconstitution starts the degradation clock regardless of prior storage
- Once mixed, the 28-day window cannot be extended—plan usage accordingly
- Light Sensitivity
- Moderate (amber vials recommended)
- High (opaque storage required)
- UV and fluorescent light oxidize methionine residues
- Store reconstituted vials wrapped in foil or in opaque secondary containers
- Contamination Risk
- Low (sealed, sterile)
- High (requires sterile technique per draw)
- Bacterial proteases degrade peptides within 48–72 hours
- Use fresh needles and alcohol swabs every time—reused supplies guarantee contamination
- Freeze-Thaw Tolerance
- 1–2 cycles maximum
- Zero (do not freeze reconstituted)
- Ice crystals mechanically disrupt peptide structure
- Freezing reconstituted TB-500 is a complete loss—plan single-use or refrigerated multi-dose only
- Visual Inspection
- White, fluffy powder; no discoloration
- Clear, colorless solution; no particulates
- Any cloudiness, color, or sediment = immediate disposal
- Visual signs lag molecular degradation—if in doubt, discard