Are the supplements in the Antiviral Regimen effective when taken along with a meal (immediately before or after)?

The supplements can be taken before, after, or during a meal and this will not impair their benefits. As you have told your clients, some people with a sensitive stomach might find it preferable to take the supplements along with a meal, just before or just after eating, to dilute out the concentration of their ingredients, but this is not strictly necessary.