If i feel a cold coming on, what are the best preventative measures to take?

Keep well rested: If one truly has gotten a cold virus, it will have to run its course. Some people take extra vitamin c (may upset the stomach) and some take extra zinc (most lozenges have lots of sugar), but how much these things help is uncertain. Avoiding overexertion, such as not running a 10k race, is wise. Anti-inflammatories like tylenol (acetaminophen) or Motrin can help with symptoms. Adequate rest and sleep helps too.

Boost immunity: The immune system acts to defend against colds. It can also help to decrease the length and/or severity of cold symptoms. Therefore if you are at the initial stages of a cold you should avoid sugary processed foods and increase nutritious whole live foods. You should increase your vitamin d intake and may also take other immune boosting products. Decrease stress and get adequate rest.