First, there's no scientific basis for doing so. Unless your diet is deficient of zinc or you're spending months in an overcast winter environment neither is going to do anything for you. They certainly won't have any impact on antibody formation.
I would encourage most people here to have their Vitamin D levels checked and take supplements, especially in the winter months.
Also certain diets could have other deficiencies, like in my case I almost never eat fish so I add omega3 (DHA).
https://journals.plos.org/plospathogens/article?id=10.1371/j...
The evidence for vitamin D is much stronger including multiple randomized controlled trials.
"No scientific basis" doesn't necessarily mean "false", otherwise you create a world where everything not mandatory is forbidden. Many doctors do exist in this world; they're always totally confident even when they're wrong, and they will tell you to not do things unless it's the specific thing they want you to do.
I'd imagine this would include ~30-40% of Americans.
Theres no scientific basis for anything until a proper study is done. Doesn't mean it isn't true. And consider that estimates are as high as 50% of scientific papers’ results are false (especially in bio).
N.B.1: I'm a scientist in a government lab
N.B. 2: I’m not impugning science, just fellow scientists.
Source?
"Most Research Findings Are False for Most Research Designs and for Most Fields" is a ridiculous claim. I don't know a single scientist who believes that. How many scientists have you spoken to in the bio field?