Pet Guard sells bottles of tablets in bottles of 160 wafers (under $10.00) or 320 wafers (about $15.00). The tablets are brewers yeast, primary grown yeast, garlic powder (fleas don't like that either), and vegetable oil. The recommended dosages are: 1 wafer for pets up to 10 lbs, 2 wafers for pets up to 20 lbs, 4 wafers for pets up to 30 lbs, and 6 wafers for pets up to 60 lbs. It recommends to use daily. We break up the wafers in four pieces - one cat will eat it and loves it. The other two are more picky so we grind the pills down a bit and mix it in their food - works wonders. Good luck!