The Immune Support Formula is an exclusive combination featuring Astragalus, a potent tonifying herbal remedy prized in traditional Chinese medicine. This evidence-based formula also contains a potent blend of immune supportive polypore mushrooms including Maitake and Reishi. Maitake mushrooms have been well studied for their ability to support healthy immune function. Reishi, another important medicinal mushroom, also bolsters natural defenses.

Taken on a regular basis, the unique combination of ingredients found in the Weil Immune Support Formula may support a healthy immune system.

"For centuries, traditional medical systems of both China and Japan have used mushrooms to increase resistance to stress and promote longevity. To enhance your immunity further, I also recommend the Chinese herbal remedy Astragalus membranaceous, which has antiviral and immune-boosting effects. You can find Astragalus extract through our Vitamin Advisor as part of the general Immune Support Formula. It's safe to take every day during cold and flu season or year-round."
Andrew Weil, M.D.

Weil Nutritional Supplements are based on stringent scientific research. Current, valid studies (published in peer-reviewed scientific journals) are the basis of our formulations, and all products are designed, selected, and approved by Dr. Weil and a team of physicians and researchers who are experts in the field of nutritional supplementation.

All our products are made by manufacturers who must meet our strict guidelines for quality control, as well as Good Manufacturing Practices in all aspects of production, testing and packaging. All product ingredients are tested both prior to and after manufacturing to ensure that the constituents and doses are correct. Additionally, our products are free of any preservatives, artificial colors or flavorings, and non-essential additives.