some studies show that zinc nasal sprays help cut a cold's severity and duration. but other studies show that zinc is no more effective than placebo. recent well-done studies on echinacea show that it is not effective in preventing colds. researchers have found no evidence that vitamin c prevents colds. however they did find evidence that vitamin c may shorten how long you suffer from a cold. to prevent colds the natural way make sure you've got a well-nourished immune system. dark greens foods like spinach are loaded with vitamins a and c. salmon is a great source of omega-3 fatty acids which fight inflammation. low-fat yogurt may help stimulate the immune system. regular exercise -- aerobics and walking -- also boosts the immune system.
how effective are natural remedies for colds such as zinc echinacea and vitamin c?