The lineup includes Prudent Turf, Prudent Turf Plus and Prudent Green, all built on urea phosphite technology.
According to the Mayo Clinic, creatine is safe to take at appropriate doses for up to five years. If you want to take more, it's worth a chat with your doctor to determine what dosage is best for you.
How long it takes for creatine to work can depend on your baseline creatine levels, consistency of use, hydration, exercise ...