I started using these around 3 or 4 years ago. I take two a day in the morning after breakfast. They are orange flavoured and taste great. I can honestly say I have never had a full-blown cold or flu since. Occasionally I thought I was coming down with something and felt a few flu type aches or a bit sniffly but I'd get up the next day and feel fine. I truly do believe taking Vitamin C helps keep respiratory illnesses away. Prior to taking them daily I would get at least one cold or flu a year or a gastric bug but nothing since I started. You can buy a large container which works out much cheaper and they are available in supermarkets.
Helps keep colds and flu away. Available in a large container and reasonably priced.
I haven't found any.