Mag-Ox (my land is deficient in magnesium and their feet really show it if I stop)
Cinnamon - one lad is EMS/Insulin resistant and it has turned him around and the others can benefit from it in smaller doses as all good doers
Turmeric/Black Pepper for the arthritic mare, really see the difference with this with the Linseed
Linseed - for general overall health, trying double dose for the mare as she is possible EPSM
All mixed in with their Baileys Lo-Cal which has all the rest of the nutrients that they need, I dabble with others depending on season like Milk Thistle in Spring/Autumn, Nettles sometimes in summer, Gut Balancer occasionally if one is runny from nerves, UlcerEase if one is showing tummy sensitivity, double dose Agnus Castus if the mares seasons are winding her up.
I usually stay with natural rather than synthetic supplements as I've always seen the benefits of them easily and have a raft of notes to remind me what goes with what. But I do use the usuals like Danilon/Bute if needed for anything and am not a tree hugger by any means!