Mannatech, Incorporated, Coppell, TX, has launched PhytoBurst Nutritional Chews. With nutrients sourced from broccoli, cranberry and grape, one serving of two PhytoBurst nutritional chews contains as much vitamin A as 2.5 fresh apricots and as much vitamin D as 4 cups of milk, according to the company. These dietary supplements are available in Lemon or Mixed-Berry flavors.