Two Chinese herbal formulas I commonly recommend to boost immunity are Evergreen Herbs Immune + and Zand Astragalus Formula. Immune + is based on a very commonly-used formula Yu Ping Feng San, which is especially used to help those who easily catch common colds or flues, or are commonly affected by seasonal allergies. Zand Astragalus is a very similar formula.
Catching colds or flues easily, and/or having seasonal allergies means that the immune system is weak and needs to be strengthened. These formulas are also ideal to strengthen the immune system when going into the winter season or when one knows they will be exposed to others who are ill from a common cold or flu, or when one is oing into a hospital or convalescent situation where others could be ill. Both of these formulas will also tend to help poor energy too.
Both of these formulas contain Astragalus (Huang Qi) and Reishi mushroom (Ling Zhi, or Ganoderma), both of which research has shown are immunoprotective. Research has also shown that Astragalus can have an antibiotic effect, is anti-asthmatic and is nephroprotective (protects the kidneys) as well. Reishi has anti-cancer properties and a broad spectrum of antibacterial activity.
More information on the two main herbs in these formulas can be found at these sample monographs from the premier resource of the Chinese Herbal Materia Medica, Chinese Medical Herbology and Pharmacology, by John Chen and Tina Chen: Huang Qi and Ling Zhi/Reishi
Astragalus is also in the Evergreen Herbs Cordyceps 3 formula. Cordyceps is especially known to treat chronic respiratory disorders; I call it a ‘Ginseng for the Lungs’ since it is also used for its ginseng-like ‘anti-aging’ qualities. Speaking of Ginseng, Panax Ginseng (Ren Shen) is in this formula as well. So Cordyceps 3 is an excellent formula for aging, poor energy or Chronic Fatigue Syndrome, and many other conditions as well that need immune-system support, including cancer.