All-rac-aplha tocopheryl acetat mg to IU


can I ask you about convert all-rac-tocopheryl acetate from mg to IU. It´s same as dl-alpha tocopheryl acetate? It´s 1 mg=1 IU? And when I have 1600 mg, it´s better for sport horses in moderate work 2500 or higher, if it is not only RRR but all 8 forms?

Thank you 
Marie Volsicka
Mid Europe

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