Most types of vitamin B are readily available in foods, but vitamin B12 is not available from plants. For this reason vegetarians and vegans who eat little or no animal products should monitor their vitamin B levels and take a supplement if required.
Read MoreZinc is often taken as an 'over-the-counter' drug to reduce the chances of getting the common cold, improve physical fitness when training, and to enhance the immune system in auto-immune conditions such as rheumatoid arthritis.
Does it really work in these conditions and if so how much should you take?
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