The 7 best vitamins and supplements to boost the immune system

In addition to repelling bacteria, Deshko explains that L-theanine may provide “a boost of antioxidants and dietary phenols, which inhibit the growth of harmful bacteria in your gut. As an added bonus, L-theanine helps promote relaxation and fight anxiety.

L-theanine is commonly found in green tea, but if you prefer a supplement rather than drinking a lot of tea, Suntheanine is one of the best selling L-theanine supplements on Amazon and has L-theanine in it. suspension in virgin coconut oil for easy absorption. In addition, the formula does not contain GMOs, gluten, soy or artificial colors.

  • Amount per serving: 200 mg of L-theanine

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Barak V, Halperin T, Kalickman I. (2001). The effect of Sambucol, a natural product made from black elderberry, on the production of human cytokines. Eur Cytokine Netw.,

Bukowski, JF, & Percival, SS (2008). The intervention of L-theanine improves the function of human T lymphocytes. Nutritional advice,

Carr, AC and Maggini, S. (2017). Vitamin C and immune function. Nutrients,

Hoffmann, PR, & Berry, MJ (2008). The influence of selenium on immune responses. Molecular nutrition and food research,

Mikkelsen, K., & Apostolopoulos, V. (2019). Vitamin B1, B2, B3, B5 and B6 and the immune system. Nutrition and immunity,

Perceval SS. (2016). Aged garlic extract alters human immunity. J Nutr.,

Rail, LC, & Meydani, SN (2009). Vitamin B6 and Immunity. Nutritional advice,

Shankar AH, Prasad AS. (1998). Zinc and immune function: the biological basis of altered resistance to infection. Am J Clin Nutr,

Tiralongo, E., Wee, S., & Lea, R. (2016). Elderberry Supplementation Reduces Cold Duration and Symptoms in Air Travelers: A Randomized, Double-Blind, Placebo-Controlled Clinical Trial. Nutrients,

Williams J; Sergi D; McKune AJ; Georgousopoulou FR; Mellor DD; Naumovski N. (2019). The health benefits of the amino acid l-theanine in green tea in animal models: promises and prospects for human trials,

Yan, F., & Polk, D. (2011). Probiotics and immune health. Current opinion in gastroenterology,


Nicole Avena, Ph.D., Assistant Professor of Neuroscience at the Mount Sinai School of Medicine and Visiting Professor of Health Psychology at Princeton University

Anthony Capasso, MD and consultant of PureLife Organics

Yelena Deshko, ND, naturopathic doctor at Timeless Health Clinic

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