Peptides generally need to be stored away from light for long-term storage, and should be stored at -20 degrees, and can be stored at 4 degrees for short-term. Can be shipped at room temperature for short periods of time. Peptides are stable at -20°C, especially when freeze-dried and stored in a desiccator. Freeze-dried peptides can be kept at room temperature before exposing them to air. This will reduce the effect of humidity, and when freeze drying is not possible, the best approach is to store small working samples. For peptides containing Cys, Met or TrP, deoxygenation buffer is essential for their dissolution, because this peptide can be easily oxidized by air, and nitrogen or hydrogen gas slowly flowing through the peptide before sealing the bottle will also reduce the oxidation. Peptides containing GIn or Asn are also prone to degradation, and all these peptides have a limited lifetime compared to those without these problematic simplicity.