Mercury Metabolism by Bacteria in Humans

Inclusion Criteria: * Subjects must be 18-80 years in age. * Subjects must be in good general health based on self-reported health status, with the exception of self-reported conditions listed in the exclusion criteria. * Subject must be willing to comply with study procedures. Exclusion Criteria: * Known allergy to fish. * Pregnant or lactating women. * Use of hair dyes or chemical treatments within the prior month and/or intent to use such treatments during the two trial periods. (Hair treatment during the washout period up to one month prior to the second trial is acceptable). * Known gastrointestinal or renal disorders. * Subjects with diminished mental capacity. * Use of antibiotics within two months leading up to the study.