Probios Equine One 30cc syringe for Horses. Probios Equine Gel contains a source of live(viable) naturally ocurring microorganisms. Aids in the digestion process as well helping digestive upsets. Dosing: Foals - 10gm at birth and at day 4. Horses-Adult - 15gm at foaling, following therapy, during training, transport or digestive upset.