If i m having a reaction to a flu shot is it ok to take echinacea?

NO: One really needs to know what reaction you are getting that you would like to avoid. Echinacea is not well studied, on the other hand the most common reactions such as low grade fever and body ache are more effectivly managed by well studied, over the counter medicines such as Acetaminophen and Ibuprofen commonly sold under the trade names tylenol (acetaminophen) and motrin.

No: Despite its popularity, some recent studies of echinacea have not found that it helps. Commonly used when people get colds...There is no good clinical evidence for its use. If echinacea does have a benefit, many researchers feel that it has not been proven.