Vitamin E acts as a antioxidant that means it will prevent rancidity of vegetable oils and butters.
0.5% is usually add at end of formulation and clearly enough for its antioxidant properties.
as castor, olive, argan oils have a very low oxidative potential, they don't need to be added by vitamin E. and you also use dabur vatika oil which I think already have its own preservative/antioxydant so you are okay.
if once a day you get oil like safflower, wheat germ, passionfruit(maracuja), evening primrose or kukui oil, they can spoil very fast so you must add vit E just after you will buy them.
HTH.