ClinVar aggregates information about genomic variation and its relationship to human health. (from NCBI website)
This resource can be accessed at http://www.ncbi.nlm.nih.gov/clinvar
NCBI has an Introduction to this resource at http://www.ncbi.nlm.nih.gov/clinvar/intro/
This example will step through looking for the same LRC variation that we looked at in the dbSNP guide - rs121908936.
Search for LCT and rs121908936:
Which returns more information on this allele: