For horses and ponies prone to cushings. The price includes the supply in 2 parts, one to be given in feed  (or syringed orally) morning and the other part in evening feed. A 500gm x 2 is a supply for approximately 11 to 12 weeks (3 months) for the loading period. Thereafter depending upon severity of condition, this may be halved and given alternate days, therefore lasting almost 6 months. 
The purpose of our herbs being in 2 parts is to address the issues more efficiently to help the animal maintain good health.