I'm not a vitamin taker. I take more medication for health issues than I'd like so I don't want to take more pills. COVID changed that. Last winter I was sick for 2 1/2 months straight. I live in Ohio and the cold mixed with runny-nosed grandbabies took a toll on my health last winter. I got Pneumonia and it got a little scary before I finally pulled out of it. My mom has been on me for years to take vitamins but I thought I ate pretty healthy and didn't need them. I just had autoimmune issues that contributed to making me vulnerable to sickness. When the virus hit I was concerned but not overly worried. I isolated but still watched my grandbabies a few days a week. A doctor on social media began recommending people take a combo of Vitamin C, Vitamin D, and Zinc so I researched it. Everything I read supported that this combination helps boosts one's immune system which I needed with or without the virus. Winter was coming and I knew not only I'd probably be sick again all winter but that I also had to avoid COVID. But vitamins are unregulated and I had no idea which brand was reputable and would give me the dose promised without fillers that could be harmful. So I researched reputable brands and Life Extension made almost every list of reputable brands. I've been taking this cocktail of vitamins for the past 8 months and I've had one 3 days long cold the entire winter. My husband is taking them too. He has COPD and gets sick a lot too and he also has had one brief cold all winter. I'm still doing what I was doing last winter watching my grandkiddles and they still have runny noses and colds a lot but I'm not getting them and I'm very much in the high-risk category for this current virus with all my health concerns. This is amazing to us. I'll never stop taking these vitamins and I feel good that I know I can just reorder and know that this product will be consistent and do the job. It's a big relief when you're a person whose health is compromised and you need to do all you can to stay on top of it