ReBoost Nasal Spray: Echinacea +6 = Fast, Natural Congestion Relief. Contains organic Echinacea plus 6 natural actives including over 20 times more of the active ingredient used in Oscillococcinum to relieve flu symptoms and cold symptoms that may be caused by the flu virus or cold virus, such as nasal congestion, headache, sinus headache, sneezing, runny nose, nasal itching and postnasal drip.