My vet suggested with Seminole Wellness Equi Safe or Purina Wellsolve Low Starch.

Anyone ever used either? The Purina is sold at more places but Seminole feeds got better reviews for overall quality. Both have low starch and low sugar and my vet said either of the two was fine.

Somewhere - behind the rider you've become, the long hours in the saddle,
the ribbons you didn't win, the falls you've taken, the tears you've cried,
and the horses you've given your heart to - is the little girl who fell in love
with the sport and never looked back. Ride for her.
-- Author Unknown