100 Billion Yeast Cells - The Direct Pitch ACTIVATOR™ contains 100% Pure Liquid Yeast plus an internal nutrient packet. This Wyeast Smack-pack™ system allows yeast metabolism to begin prior to inoculation as well as providing proof of yeast health. Our ACTIVATOR™ is designed to inoculate 5 gallons of wort with the same pitch rate recommended by professional brewers.