An antioxidant. Has a role in maintaining healthy cartilage, tendons and bone. 

Introduce gradually into diet over a two week period. 
Add to feed, split into two feeds (morning and night) where possible. 
Always provide access to clean water.

1 scoop = 5 g
Morning feed: 1/2 x scoop (2.5g)
Night feed: 1/2 x scoop (2.5g)

Approximately one tea spoon (5 g) per day as required.
Recommended rate based on a 500kg horse.