The Research

There has been a large amount of research compiled about vaccines; in general, anything unfavorable goes largely unreported. In fact, most of the funding in the research world comes from organizations that expect (some say insist) that the results are favorable.
Only a few studies have been done to compare a very important metric, vaccinated versus unvaccinated outcomes, and these have been suppressed or underreported more than any. See the next section, Vaxxed versus Unvaxxed
Other resources:
Dr. Tenpenny’s Vaxxter.com
An Epoch Times report: How Measles Vaccines Alter Our Natural Immunity
A video presentation: This Is What Happens When You Don't Jab Kids: Vaccinated vs. Unvaccinated Data
Note: For information specific to COVID-19 and related mRNA vaccines, see COVID-19 ‘Vaccines’.