LC-Plasma for Preventing URTIs and Reducing Symptoms

Inclusion Criteria: * Adults aged 18-60 years living in Australia * Individuals with a history of recurrent upper respiratory tract infections * Able to provide informed consent * Generally healthy * Agree to not participate in another clinical trial while enrolled in this trial * Agree to maintain their usual daily activities without significant changes. This includes not changing their current diet or stopping/starting a new exercise regimen during entire study period * Agree not to travel internationally for over 1 month in a single trip during the intervention period (baseline to study completion). * Females of childbearing potential must a prescribed form of birth control Exclusion Criteria: * Serious illness e.g., liver disease, kidney disease, heart disease, mood disorders, neurological disorders such as multiple sclerosis. * Unstable illness e.g., changing medication/treatment. * BMI \<18.5, \>30 * Current malignancy (excluding Basal Cell Carcinoma) or chemotherapy or radiotherapy treatment for malignancy within the previous 2 years. * Individuals with chronic respiratory conditions (e.g., asthma, chronic obstructive pulmonary disease). * Has current symptoms of an acute sickness. * Active smokers, nicotine use or drug (prescription or illegal substances) abuse * Current alcohol use (\>14 alcoholic drinks week) * Allergic to any of the ingredients in the active or placebo formula * Pregnant or lactating woman * People medically prescribed medications within the last month that would affect the immune and/or the inflammatory response excluding topical steroid use. * Participants who are currently participating in any other clinical trial or who have participated in any other clinical trial during the past 1 month * Participants with cognitive damage * Participants with seasonal allergic rhinitis * Regular use of antihistamines * Individuals deemed unsuitable for participation by the Principal Investigator (PI) of this study.