Enhance blood flow to the heart blood vessels toned, flexible and youthful for improved circulation. Herbalife Niteworks Support healthy blood pressure levels already within a normal range. Nightworks by Herbalife developed with Nobel Laureate in Medicine Dr. Lou Ignarro, Herbalife Niteworks helps your body produce Nitric Oxide (NO), for improved circulatory, immune and nervous system functions. L-arginine and L-citrulline trigger cells to produce and recycle more NO. This is not the lage 10.6 oz Niteworks.