The berries and flowers of elderberry are packed with antioxidants and vitamins that may boost your immune system. They could help tame inflammation, lessen stress, and help protect your heart, too. Some experts recommend elderberry to help prevent and ease cold and flu symptoms.

Echinacea is widely used to fight infections, especially the common cold, the flu, and other upper respiratory infections. Some people take echinacea at the first sign of a cold, hoping they will be able to keep the cold from developing. Other people take echinacea after cold symptoms have started, hoping they can make symptoms less severe.

Garlic supplements help prevent and reduce the severity of common illnesses like the flu and common cold.

Zinc is a nutrient that plays many vital roles in your body. Because your body doesn’t naturally produce zinc, you must obtain it through food or supplements. Zinc helps keep your immune system strong. Because it is necessary for immune cell function and cell signaling, a deficiency can lead to a weakened immune response.

Reishi mushroom has been used to help enhance the immune system, reduce stress, improve sleep, and lessen fatigue. People also take reishi mushroom for health conditions such as Viral infections such as the flu, shingles and AIDS, among others..

Andrographis is most widely used to treat cold and flu symptoms. Andrographis is also said to act as a natural immune-booster. The herb has been used to treat certain other conditions.

Astragalus is a natural dietary supplement that's used for various health conditions. For instance, it's used to treat the common cold, upper respiratory infections, fibromyalgia, and diabetes. Some proponents of astragalus use it for its possible heart benefits. They claim it may protect against heart disease. It's also used to help improve overall weakness.

Vitamin C is an essential vitamin, meaning your body can’t produce it. Yet, it has many roles and has been linked to impressive health benefits. One of the main reasons people take vitamin C supplements is to boost their immunity, as vitamin C is involved in many parts of the immune system. First, vitamin C helps encourage the production of white blood cells known as lymphocytes and phagocytes, which help protect the body against infection.

Niacin, also known as vitamin B3, is an important nutrient. In fact, every part of your body needs it to function properly. As a supplement, niacin may help lower cholesterol, ease arthritis and boost brain function and improve the immune system, among other benefits.

Pyridoxine is required for the proper function of sugars, fats, and proteins in the body. It is also required for the proper growth and development of the brain, nerves, skin, and many other parts of the body.