Not a direct answer to your vit e question but... be aware that the madbarn AT can take some getting used to for some horses. My gelding took a few weeks to really decide he was going to eat it. Not trying to discourage you from using the product,  just be aware.
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Allison in Ontario 2020

Sonseeahray Case History: https://ecir.groups.io/g/CaseHistory/files/Allison%20and%20Sonseeahray
Keegan Case History: https://ecir.groups.io/g/CaseHistory/files/Allison%20and%20Keegan
Keegan XRays and Hooves Photo Album: https://ecir.groups.io/g/CaseHistory/album?id=255699&p=Name,,,20,1,0,0