Echinacea: cold comfort.
D001205:Ascorbic Acid / Q000627:therapeutic use; D003139:Common Cold / Q000188:drug therapy* / Q000191:economics / Q000276:immunology; D003257:Consumer Product Safety; D019587:Dietary Supplements / Q000191:economics; D004340:Drug Contamination; D020900:Echinacea / Q000276:immunology; D006801:Humans; D007854:Lead; D028321:Plant Preparations / Q000191:economics / Q000276:immunology / Q000627:therapeutic use*; D014481:United States; D015032:Zinc / Q000627:therapeutic use
D028321:Plant Preparations; D007854:Lead; D015032:Zinc; D001205:Ascorbic Acid