For an average size cat give 1 teaspoon of brewer's yeast per day (mix it in their food). If you're talking about kittens under 5, 6 or 7 pounds I suggest asking a veterinarian to be sure.
You can also dust your cat's coat with brewer's yeast as a flea powder.
*Warning! Some cats are allergic to yeast. If you see an adverse reaction, stop adding the brewer's yeast to their food.
**And another warning! NEVER EVER give cats or dogs garlic nor let them eat anything in the allium plant family because it causes Heinz Body Anemia which will eventually cause internal organ failure! Alliums include garlic, any and all types of onions (including chives), leeks, etc. and even flowers like lily's.
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