Recent research suggests that some echinacea supplements may shorten the duration of a cold by about half a day and may slightly reduce symptom severity
Benefits. The berries and flowers of elderberry are packed with antioxidants and vitamins that may boost your immune system. They can help tame inflammation, lessen stress, and help protect your heart, too. Some experts recommend elderberry to help prevent and ease cold and flu symptoms
Hyssop is used for digestive and intestinal problems including liver and gallbladder conditions, intestinal pain, intestinal gas, colic, and loss of appetite. It is also used for respiratory problems including coughs, the common cold, respiratory infections, sore throat, and asthma. Hyssop is an antioxidant that may kill cancer cells and prevent the spread of viruses, including HIV. It may also treat ulcers.