Effect and Tolerability of a Nutritional Supplement Based on a Synergistic Combination of β-Glucans and Selenium- and Zinc-Enriched Saccharomyces cerevisiae (ABB C1®) in Volunteers Receiving the Influenza or the COVID-19 Vaccine: A Randomized, Double-Blind, Placebo-Controlled Study. - Rodriguez JAM; Bifano M; Roca Goma E; Plasencia CM; Torralba AO; Font MS; Millán PR (Nutrients, 2021)