Licensed U.S. Pharmacy

Feline Immunity Support

The immune system is a complex array of cells that are found throughout the body. Look for these recommended products to help support immune system function and performance in cats.

Click on a brand, treatment, or application and scroll down to see product results.

Viralys L-Lysine Supplement for Cats

Price: $28.99

Recurring Item

Low Price Guarantee

We will gladly match any competitors’ current advertised price.

Competitor must be based in the United States, sorry we cannot honor foreign country prices or sites that are membership priced.

Learn more

Fast & Free Shipping

Orders Over $75 Qualify for FREE Ground Shipping (Excludes Items that Require Cooler or Express Delivery).

Learn more

Satisfaction Guarantee

Every purchase you make at HeartlandVetSupply.com is covered by our satisfaction guarantee.

If you are not completely satisfied, please contact us within 30 days.

Learn more

.Pharmacy

Heartland Veterinary Supply & Pharmacy is a .Pharmacy Accredited Pharmacy

Located in Hastings, Nebraska, Heartland Veterinary Supply & Pharmacy started as a Veterinary Clinic in 1981, specializing in the health and wellness of the equine, canine and feline species. We have a licensed Veterinarian and Pharmacist on site, as well as a helpful team with the knowledge and products you need to keep your horse, dog or cat healthy and happy. The Heartland Staff is dedicated to fast, courteous service.

"Because buying prescription drugs from the Internet is easy, finding a safe source for those medicines is not."

See what our customers are saying.