Echinacea is a popular herb used worldwide. These plants contain a variety of active compounds that function as antioxidants used to defend cells against oxidative stress, a state linked to various diseases. Some of these important antioxidants are flavonoids, cichoric acid, rosemarinic acid, and alkamides. The alkamides have been shown to renew antioxidants and help them better defended against molecules prone to oxidative stress. https://www.ncbi.nlm.nih.gov/pubmed/26009695, https://www.sciencedirect.com/science/article/pii/S030881460600046X
Echinacea is best known for its positive effects on the immune system. Numerous studies have shown that this herb supports immune system function, reducing the risk of contracting viruses and infections. One study done reported that the immune system benefited from 10 milligrams of echinacea per one kilogram of body weight, taken every day over a 10-day period. A meta-analysis found that echinacea may decrease the risk of catching the common cold by more than 50% and reduce the duration by one and a half days. https://www.ncbi.nlm.nih.gov/pubmed/23195946, https://plants.usda.gov/plantguide/pdf/cs_ecpu.pdf, https://www.ncbi.nlm.nih.gov/pubmed/17597571
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