Mills Nutrients - C4Lays the Foundations for Bigger, Better, Sweeter Tasting Fruits C4 from Mills Nutrients gets your plants off to a flying start in the bloom phase. It uses a unique blend of ingredients that jump start the flowering process, laying the foundations for bigger yields and better quality levels further down the line. How C4 Works C4 contains a blend of phosphorus, potassium, biostimulants and carbohydrates. Phosphorus and potassium are two essential