There are literally hundreds of articles dealing with supplements that boost the immune system, that have been published in the Journal of the AMA. In
order for such articles to be printed, they have to have gone through the peer review referee process.
For those not familiar with that process:
Peer review (also known as refereeing) is the process of subjecting an author's scholarly work, research, or ideas to the scrutiny of others who
are experts in the same field. Peer review requires a community of experts in a given (and often narrowly defined) field, who are qualified and able
to perform impartial review. Impartial review, especially of work in less narrowly defined or inter-disciplinary fields, may be difficult to
accomplish; and the significance (good or bad) of an idea may never be widely appreciated among its contemporaries. Although generally considered
essential to academic quality, peer review has been criticized as ineffective, slow, and misunderstood (see anonymous peer review and open peer
review). Pragmatically, peer review refers to the work done during the screening of submitted manuscripts and funding applications. This process
encourages authors to meet the accepted standards of their discipline and prevents the dissemination of irrelevant findings, unwarranted claims,
unacceptable interpretations, and personal views. Publications that have not undergone peer review are likely to be regarded with suspicion by
scholars and professionals.
en.wikipedia.org...
Note the underlined text. Since the process is meant to REJECT articles that deal with unwarranted claims, there are only two conclusions to reach:
1.) The Peer review process is severely FLAWED.
2.) The claims that nutritional supplements boost the immune system.
Option 1 is extremely unlikely, because if it were true, it would mean that the entire AMA Journal procedure is useless.
Option 2 seems the only alternative.
Since VACCINES are supposed to "boost immunity" against the flu, either:
1.) They do
2.) They don't
If 1 is true, then that gives credence to the nutritional claims.
If 2 is the correct option, then why take the flu shot?
In any case, no matter how you look at it, taking nutritional supplements is no worse than taking the flu shot, from a logic point of view.