Hairball Support Cat Powder promotes the natural elimination and prevention of hairballs. 60 Day Supply. Prevent hairballs and naturally promote gentle elimination. This easy-to-use powder supplement contains psyllium seed husks loaded with fiber to naturally and gently allow hairballs to safely pass through the intestinal tract. Veterinarian-formulated and manufactured in Vermont, our Cat Hairball Support Powder is free of corn, artificial flavors and dyes, and has a great chicken liver taste your kitty will love!