inclusion criteria: * provision of signed and dated informed consent form * stated willingness and demonstrated ability to comply with all study procedures and availability for the duration of the study * aged 20-65 * lives in the united states within driving distance of the research center * in good general health as evidenced by medical history * bmi \<31 * ability to take oral supplements and willing to commit to taking 2 capsules a day for 3 months * for females of reproductive potential: use of highly effective contraception for at least 1 month prior to screening and agreement to use such a method during study participation and for an additional month after the end of the intervention period * employed full time in an occupation with direct and prolonged exposure to the public (i.e. teacher, healthcare provider, etc) or regularly engaged in high exposure activities. * agreement to adhere to lifestyle considerations throughout study duration

inclusion criteria: * provision of signed and dated informed consent form * stated willingness and demonstrated ability to comply with all study procedures and availability for the duration of the study * aged 20-65 * lives in the united states within driving distance of the research center * in good general health as evidenced by medical history * bmi \<31 * ability to take oral supplements and willing to commit to taking 2 capsules a day for 3 months * for females of reproductive potential: use of highly effective contraception for at least 1 month prior to screening and agreement to use such a method during study participation and for an additional month after the end of the intervention period * employed full time in an occupation with direct and prolonged exposure to the public (i.e. teacher, healthcare provider, etc) or regularly engaged in high exposure activities. * agreement to adhere to lifestyle considerations throughout study duration

inclusion criteria: provision of signed and dated informed consent form stated willingness and demonstrated ability to comply with all study procedures and availability for the duration of the study aged 20-65 lives in the united states within driving distance of the research center in good general health as evidenced by medical history bmi <31 ability to take oral supplements and willing to commit to taking 2 capsules a day for 3 months for females of reproductive potential: use of highly effective contraception for at least 1 month prior to screening and agreement to use such a method during study participation and for an additional month after the end of the intervention period employed full time in an occupation with direct and prolonged exposure to the public (i.e. teacher, healthcare provider, etc) or regularly engaged in high exposure activities. agreement to adhere to lifestyle considerations throughout study duration

inclusion criteria: provision of signed and dated informed consent form stated willingness and demonstrated ability to comply with all study procedures and availability for the duration of the study aged 20-65 lives in the united states within driving distance of the research center in good general health as evidenced by medical history bmi <31 ability to take oral supplements and willing to commit to taking 2 capsules a day for 3 months for females of reproductive potential: use of highly effective contraception for at least 1 month prior to screening and agreement to use such a method during study participation and for an additional month after the end of the intervention period employed full time in an occupation with direct and prolonged exposure to the public (i.e. teacher, healthcare provider, etc) or regularly engaged in high exposure activities. agreement to adhere to lifestyle considerations throughout study duration