Natural Factors Echinamide Echinacea & Goldenseal Tincture - This combination of British Columbia-grown echinacea flowers and roots with goldenseal roots work together to fight a broad spectrum of viruses, bacteria, fungi, and yeasts. The patented extract Echinamide has been proven consistently to enhance immune system function. When taken at the first sign of infection, Echinamide may stop a cold from developing, may ease symptoms and accelerate healing. Goldenseal is an antimicrobial and immune-boosting herb. The main active constituent of goldenseal, berberine, is clinically shown to have antimicrobial effects against a wide variety of pathogens, including bacteria, yeast, and fungus.