Get the Nutritional Equivalent of These Foods in 2 PhytoBurst Chews Mannatech’s PhytoBurst Nutritional Chews are loaded with key nutrients and goodness from food-sourced vitamins, minerals and antioxidants. While not intended to completely replace multivitamins or antioxidant supplements, PhytoBurst chews are a convenient, tasty way to get extra vitamins, minerals and antioxidants into the diet. Each two-chew serving of PhytoBurst chews delivers the equivalent of the vitamins, minerals and phytonutrients shown in the chart below.