Lysine should not be taken over long periods. Prescription drugs are available to help with cold sores and they are effective, but they can be very expensive. Promotes sleep, counters jet lag, improves sex life, etc. There is promise that melatonin may be effective as a sleeping pill. However, it may have serious side effects.
Further research is needed to determine the safety and efficacy of melatonin.
This is not a cold cure, but it can reduce the symptoms of a cold. Ideally, you should get as much vitamin C from produce-natural foods, that contain other beneficial substances. You can also take 250 to 500 milligrams daily as a supplement. May help prevent cancer, heart disease and cataracts. Zinc is not recommended for prostate problems and the effect of zinc against macular degeneration are weak.