I bought it to my kid for colds. It helps, but you need to take it in time, when you see the very first symptoms. If you are late it wont help. To prevent getting cold i found another good product - grapefruit seed extract. But you need to look what there was not less than 800mg bioflavonoids in 100mg product. I put 15 drops to my kids tea every morning. And it helps. Click "yes" below, if this review was helpful.