Vitamin C Powder is suitable for all species and is comprised of Sodium Ascorbate, which is a  buffered form of Vitamin C therfore not acidic. 
Most animals synthesise vitamin C naturally in their bodies, but due to stress, competition, travel, illness or injuries the demand may easily exceed the supply.  ER sodium ascorbate powder is  is a human grade supplement suitable for all species.
Due to the continual increase of environmental pollution, this is a must have in the feed room!