Zylkene is built on alpha-casozepine, a protein derived from milk casein. Every product in the range uses it; what changes is the format and the strength. It is described by the manufacturer as non-drowsy, which is the practical difference between it and a sedative — the aim is to take the edge off without flattening the animal.
Capsules or chews, and which strength
Two formats are stocked. The capsules come in three strengths that map to body size: one for cats and small dogs, in 30 or 100 capsules, and separate medium-dog and large-dog capsules in 30s. Capsules can be given whole or pulled apart and the powder stirred through food, which is usually the easier route with a cat. The soft chews are dogs only, in 14-packs for medium and for large dogs, and suit a dog that treats a capsule as a foreign object. Whichever you choose, match the pack to the animal's weight band — the size on the label is the dosing instruction, not a suggestion.
Where it fits
A calming supplement is a support, not a treatment. It is commonly reached for around a known, bounded stressor: fireworks season, a house move, travel, a stay in a boarding kennel, a new pet arriving. Ongoing anxiety, or behaviour that is getting worse, is a conversation with your vet — who can also confirm this is sensible alongside any medication your pet is already on.
