We guarantee the purity/stability of XXXXX for xxx months from receipt. The guarantee date for research compounds is the time Avanti guarantees the product to meet the release specifications when stored unopened at -20°C ± 4°C in its original container. The guarantee date for an Avanti research product is not representative of the shelf life from the true manufacture date. The actual shelf life of the product may be well beyond the guarantee date. However, after the guarantee date, it is the customer’s responsibility to determine the quality of the lipids received, not Avanti.