Vitamin C and Zinc play important roles in nutrition, immune defence and maintenance of health. A systematic review of trials on the effectiveness of zinc for the common cold found that Zinc supplementation resulted in a modest reduction in the length of symptoms.
Preliminary trials have shown that high dose Vitamin C and Zinc provided quicker symptom relief in subjects with a common cold.
Though more research is needed to demonstrate the benefits, vitamin C and zinc can be used safely together.
Zinc supplement are safe to consume, but at excessively high levels (around 200mg/day) may result in side effects including nausea, vomiting, loss of appetite, diarrhoea.
Zinc supplementation in the range of 50-150mg/day may interfere with copper absorption and can lead to low immune function, and reduced iron function.
Although zinc is often recommended to be taken on an empty stomach, this may result in nausea, in which case it's recommended that you take it with food.
If taken as part of a multivitamin, it's recommended that the multivitamin be taken with food.
There are several different forms of zinc available, including zinc citrate, zinc glycinate and zinc picolinate.
These forms of zinc are all safe and well-tolerated.
Common signs of excess zinc may include nausea, vomiting and diarrhoea. Excess consumption of zinc can also result in low copper status, low iron status and low immunity.
If you are experiencing any of these symptoms we advise you to consult with a healthcare professional.