Hey Rick, I'm with your son. I know it's not the best for you, but I quit drinking beer, every day anyway, and started drinking 2-3 Rip It energy drinks. I've had 2 or 3 colds in the last 3 years. No strep, no flu, no bronchitis! Good vitamins!
Rip It's are only $0.99, unlike Monster or whatever, at around $1.99-$2.49. If you have a good Indian (from India) around, they are $1.00 even! I drink the sugar free "Power" flavor (purple). Love them!