The North American herb, Echinacea, grown and used widely in Australia.
Echinacea is often known for its "buzzing" in the mouth effect. This is created by the chemicals in the plant that provide its immune boosting effects. If your echinacea product doesn't produce this, chances are its not very good. The chemicals, known as alkynamides are present in the root and flower and part of the plant's defence against infection.
With the colder weather again approaching and the inevitable cold and flu season, those of us with compromised immune function may well want to consider boosting our immune system with time honoured medicinal herbs. Herbs have always been with us. Herbs like echinacea, astragalus, andrographis all have proven ability to boost our immune cells that help to keep us free of infection. These types of herbs can be used for acute and chronic conditions, check with your qualified herbal practitioner what is best for you, and remember if a liquid preparation doesn't suit you, there are plenty of other ways to dose yourself. Don't wait until symptoms arise, act now so you can enjoy the winter months.