An equal blend of the following to be fed at 30-50g daily:

Linseed - source of omega oils
seaweed - vitamins and mineral
rosehips - vitamins especially vitamin C
brewers yeast - vitamins especially B vitamins
agnus castus - to help normalise hormone levels
psyllium husk powder - to absorb excess sand in the gut
magnesium oxide - to strengthen the hooves and useful as a calmer