Hi Bonnie,

The question of whether vit E mixed with oil prior to being added to pelleted or powdered supplements is as available as in oil-filed capsules has not been answered yet here, and maybe there's no way to know for sure without an actual study on it. 

Scott at Mad Barn, whose website states he has 20+ years experience combined with an MSc in physiology and nutrition (presumably equine?) and is working on his PhD now, feels that adding oil before pelletizing is perfectly fine.  He wrote to me that there is no need for oil-filled capsules.

Some horses here seem to reject the Mad Barn products, but I've had no issues.

--
Kirsten and Shaku (IR) - 2019
Kitimat, BC, Canada
ECIR Group Moderator
Shaku's Case History  
Shaku's Photo Album