It is suitable to take 1 pill daily as an anti-virus/cold/flu protection as it has a little bit different properties than regular vitamin C. I recommend it to anybody with a decreased immune system. I wish it could be more obtainable/accessible here as it is in Europe.!!! I'm happy "Apteczka" has it and, I will spread the news to Europeans living in the South area of this country so they could/would purchase too.