We've known for ages - https://www.forbes.com/sites/daviddisalvo/2015/10/26/the-popular-over-the-counter-cold-medicine-that-science-says-doesnt-work/?sh=417922b

We've known for ages - https://www.forbes.com/sites/daviddisalvo/2015/10/26/the-popular-over-the-counter-cold-medicine-that-science-says-doesnt-work/?sh=417922b84753 https://www.forbes.com/sites/daviddisalvo/2015/10/26/the-pop...