Homeopathic

Homeopathic. Best known is probably Rescue Remedy flower essence.
Nutritional supplements. B group-vitamins are reputed to reduce anxiety - many cats like the yeast supplements that provide these.

Homeopathic: A system of veterinary practice that treats a disease by the administration of very minute doses of a remedy that in a healthy animal would produce the symptoms of the disease that is being treated.

On very rare occasions I have given things such as Rescue Remedy the homeopathic stress reliever as my cat is nervous but that is all.
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See also: Neuter, Forest Cat, Veterinarian, Valerian, Vaccine