I am 68 years old. I have had asthma and chest infections since I was 9 years old. there has never been a winter in the past 59 years where I have not had at least one chest infection where I’ve had to take antibiotics. I’ve waited till the end of this winter 2018 to write to you and say I have had my first winter without a chest infection and antibiotics ! now, i can’t say that my taking active silver twice a day, every day is the definitely the reason - but I’m pretty sure it’s had a lot to with me having my first healthy winter for 59 years. if the same happens next winter then it is definitely active silver without a doubt.