ReBoost Throat Spray: Zinc +13 = Fast Sore Throat Relief. Contains the Zinc of in Zicam, plus over 20 times more of the active ingredient used in Osciollococcinum, plus 12 additional natural actives to relieve sore throat pain and accompanying flu symptoms and cold symptoms that may be caused by the flu virus or the cold virus such as cough, fatigue, nausea, body ache and headache.