Answer: Well, a reputable commercial diet fed according to the manufacturer’s instructions will almost certainly supply adequate levels of vitamins and mineral and should not require any supplementation. In fact, precise amount of vitamins B1 and A are added to compensate for the losses that occur during manufacture and storage. A varied and balanced home prepared diet will also need no supplementation, though supplementation of an unbalanced home prepared diet, such as one base primarily on muscle meat, is required, but only in respect of calcium, phosphorus and vitamin B. For an adult cat sufficient calcium and phosphorus can be provide by adding to each 8 oz (250g) of meat 1/8 oz of sterilized bone meal or some alternative proprietary supplement. Vitamin B should be provided by giving your cat two brewer’s yeast tablets daily.
A bone prepared meat of fish diet for kittens, which is fed from when they first begin to take solid food up to six months of ages, should be supplemented of each day with ¼ oz of sterilized bone male (bone flour), a half to one brewers’ yeast tablet and one to two drops of cod-liver oil. Greater amounts then these could be harmful.