How can I find more information about a particular SNP?

Go to Scholar.Google.com and type in the rsid number of the variant you would like to learn more about (e.g.: rs7412). Google Scholar will return a list of any research including that search term. This search is often more helpful than Pubmed, as Pubmed links to articles that may be behind a subscription pay wall, whereas Google Scholar will show if any free version exists on the internet. From there you can 1) scroll the resulting list or 2) further narrow you search by adding keywords of interest to the search box or 3) limit your search using filters like date, author, etc. N.B.: Just because an article appears in a list for any given snp, it is merely a flag for research that mentions the SNP. The research may not have found an association or even mention that SNP at all, e.g. it appeared in the bibliography only. You must read the research itself otherwise known as using human intelligence. In order to perform an exhaustive search you must also use all other aliases or names for the SNP in question, eg: MTHFR C677T instead of rs1801133 or COMT V158M for rs4680. Early on (and even now!) in the field of gene mutation research, rsid numbers were not uniformally used as designators for the SNP in research or keyword tagging.