This is an excellent product for malnourished or sick animals to help maintain weight and provide additional nutrients and calories.  It is also a great help in stimulating the appetite in those who are compromised or ill.  A dab on a finger or on a morsel of food is usually enough to get them interested. Compare it to Nutri-Cal or Nutri-Stat, and you will find it is a similar, quality product for much, much less. You can basically get two tubes of Doc Roy's Forti-Cal for the price of one of the others mentioned. It is flavorful and my dog will readily take it. I often drizzle it on a peanut butter sandwich and cut into small squares.  He loves it! He sometimes even prefers it over cooked chicken breast etc. Thus far, I am very satisfied with the products I have purchased from Revival, and very happy that Amazon does business with this merchant.