Storage & Handling

Lyophilized powder (as shipped)

• Long term: -20 °C, sealed, protected from light. Stable for years at this temperature.
• Short term: 2–8 °C is fine for weeks.
• In transit: ambient temperature is acceptable. Published stability data supports roughly 30 days at room temperature for most sequences — far beyond any shipping window. Cold-chain shipping is unnecessary for powder.
• Let a cold vial reach room temperature before opening, so condensation doesn't form inside it.

Reconstituted solution

• Store at 2–8 °C and use within 30 days.
• Keep the vial upright and protected from light.
• Avoid repeated freeze/thaw cycles. This is the single largest cause of degradation in handled material. If you must freeze, aliquot first so each portion is thawed once.
• Label every reconstituted vial with compound, concentration and date.

Reconstitution technique

• Use bacteriostatic water (0.9% benzyl alcohol) for multi-withdrawal vials, or sterile water for single-use preparations.
• Wipe both stoppers with an alcohol prep pad and let them dry.
• Direct the solvent slowly down the inside wall of the vial. Never inject it straight onto the powder — the force damages the peptide.
• Swirl gently, or let the vial sit until fully dissolved. Do not shake. Agitation shears peptide bonds and produces foam that traps material.
• Discard any vial where the solution is cloudy, discoloured, or contains visible particulate after full dissolution.

Concentration math

Concentration is simply the peptide mass divided by the solvent volume added:

5 mg peptide + 2 mL bacteriostatic water = 2.5 mg/mL (or 250 mcg per 0.1 mL).

Adding more solvent does not change the total amount of peptide in the vial — only how concentrated each withdrawal is. Choose a volume that makes your working measurements land on graduations you can read accurately.

Signs material has degraded

• Powder that has visibly clumped, yellowed or gone sticky before reconstitution.
• Solution that turns cloudy or develops particulate after previously being clear.
• A vial that has lost its vacuum seal or shows a compromised stopper.

If a vial arrives in any of these states, photograph it and email contact@klresearchsupply.com within 48 hours of delivery for a replacement or refund, per the refund policy.