I have a senior kitty and she has always been a little frail. A few months ago she had dropped a significant amount of weight in a short time and slowed down her eating… I went into a panic. I saw information on your Sustain HDN Feline and tried it. Almost immediately she rebounded and began to take to the Sustain. I mixed it with her wet food as well as a few other food items. But the wet food was her favorite I was so happy that she began to respond to it. Within 2 weeks she had gained almost a lb. which is remarkable for her. Nothing else worked for her I feel this Sustain helped save her and make her stronger. Zoey thanks you and so do I!