Most medical journals are easy to access on the internet through a huge electronic database known as Medline or PubMed.
This service is brought to you by the National Library of Medicine and the National Institutes of Health. In other words, by your tax dollars.
Generally it is money well spent, until you go searching for high-dose vitamin therapy research papers. Then you will find that you can't find a lot of them. The reason is selective indexing.
"Selective indexing" is a nice name for censorship. After over 40 consecutive years of publication, the Journal of Orthomolecular Medicine is still not indexed by Medline. The Journal has just been censored, again, after its most recent application...
( Follow the link - the headline is a link to the original article - for advice on what action to take to put an end to this shameful state of affairs... )