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Select Dietary Supplement Ingredients for Preserving and Protecting the Immune System in Healthy Individuals: A Systematic Review

期刊

NUTRIENTS
卷 14, 期 21, 页码 -

出版社

MDPI
DOI: 10.3390/nu14214604

关键词

dietary supplements; immune health; systematic review; resilience; acute respiratory infection

资金

  1. Office of Dietary Supplements, National Institutes of Health [HU0001-21-1-0004]
  2. Consortium for Health and Military Performance, Operation Supplement Safety [HU0001-18-2-0099]

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This systematic review critically evaluates the purported benefits and potential harms of immune health products. Due to specific research gaps, firm statements about the overall evidence-base and effectiveness of these products and ingredients cannot be made.
Immune health products represent approximately 10% of all US dietary supplement sales. Claims made on products to support or boost the immune system are attractive to the otherwise healthy consumer who may or may not be experiencing certain life stressors. The purpose of this systematic review is to critically evaluate the purported benefits and/or potential harms of select dietary supplement ingredients frequently listed on the labels of products having immune health or related market claims. With a focus on resilience, research questions were related to whether dietary supplement ingredients are efficacious in preserving and protecting immune health in healthy individuals; and when faced with a stressor, whether taking a supplement prophylactically can assist in maintaining health and resisting or bouncing back more quickly. Thirty-nine randomized controlled studies involving populations including children, adults and seniors exposed to stressors, such as air travel, intense exercise, academic stress, and/or exposure to winter weather, met eligibility criteria. The studies included eight of the 27 supplement ingredients identified through a market-driven scoping review. Those ingredients used in single ingredient products were echinacea, elderberry, garlic, vitamin A, vitamin C, vitamin D, vitamin E, and zinc. Whereas some studies may point to evidence for benefit, specific gaps preclude the authors from making firm statements with regard to the overall evidence-base for these products and ingredients and in answering the research questions. As we move toward a vision of health promotion and resilience rather than a sole focus on disease prevention and treatment, further work in this area of dietary supplements is of utmost importance.

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