The PI's goal of this [interventional/clinical trial] is to [explore the antiviralproperties of vitamin D3 on saliva samples collected before and after the use of avitamin D3 mouthwash] in [ adult participants, both genders, with COVID-19 who testedpositive on a swab test]. The main question[s] aims to answer [is]:[Assess the antiviral potential of a novel vitamin D-based mouthwash in COVID-19-positiveparticipants].PI will compare both [Control group: saliva only- before use of mouthwash], and the[study group: after use of the mouthwash in saliva] to see if there is [any veridicaleffect present in saliva after running lab tests].Participants will [self-collect saliva in a given tube (color coded orange), then 10-15minutes later or more, participants will swish with D3 mouthwash, and will give anothersample [saliva + mouthwash] in another (green labeled tube). For each participant, eachof the following will be given: - 2 collecting tubes: orange labeled tube (for saliva collection only) and green labeled tube (for saliva collection after mouthwash use). - The vial containing vitamin D3 mouthwash.