Growth factor shelf life is influenced by many factors, including storage state, buffer ingredients, storage temperature and the stability of the protein itself. Generally speaking, growth factors are most stable when lyophilized.  Our lyophilized proteins have been verified to be stable at room temperature for 3 days, or frozen for up to 2 years (either at -20 oC or -80 oC).
Once reconstituted, recombinant proteins can be stored at 4oC for 1-2 weeks, however we recommend freezing single use aliquots and defrosting fresh each time to ensure maximum protein stability and activity. Reconstituted proteins can be stored frozen for up to 1 year. When freezing reconstituted growth factors prepare single use aliquots. Every freeze-thaw cycle may cause some denaturation of the protein so repeated freeze-thaw cycles should be avoided. Always check the product sheet for freezing recommendations, but generally -20°C is suitable for short-term storage and -80°C for long term storage.