Keep the product at 2-8 degree C with sterile condition for up to 3 months as an undiluted liquid. "DO NOT FREEZE". Prepare working dilution fresh each day. For long term storage, add an equal amount of glycerol, mix and stored at -20 degree C. Alternatively, the product may be aliquoted and stored at -70 degree C or below without adding glycerol. Avoid freezing and thawing frequently.