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Is there a commercial control (ie lyophilized) available for beta-carotene (retinol and alpha-tocopherol would also be convenient but not compulsory)? If not what does everyone who uses a HPLC method for the determination of Vit A&E and beta-carotene use for a control material? Include stability and storage conditions when replying. Michael Freemantle Sullivan Nicolaides Pathology PO Box 344 Indooroopilly Q4068 Brisbane Australia 4068 ph +61 (0)7 33778638 fax +61 (0)7 38405989 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%