Zylkene is a clinically proven calming supplement containing ingredients of natural origin for dogs and cats facing challenging situations. How does it work? Zylkene contains a natural milk protein called alpha casozepine that has been clinically proven to calm and relax animals. Alpha casozepine delivers ‘calming messages’ to the brain via the body’s natural ‘messenger’ system (scientifically known as Neurotransmitters) to naturally calm your cat or dog. Easy to give The complementary feed is easy to give. For larger dogs, simply feed them the palatable chew. When to give Zylkene? Give Zylkene 1-2 days before a triggering event or change in environment. These short-term triggers may include firework displays, thunderstorms, being home alone, travel or boarding, moving to a new house, a trip to the groomer or vet. Zylkene calming supplements are an ideal choice to help support your cat or dog during these challenging situations.