I am all for prevention and vitamin supplements rather than medicines, so I like the idea of an immune system booster. I tried this product in particular because there was a sale at my local drug store, and made it very affordable. I think the "citrus" flavor might be a little misleading, because the first thing I thought was orange flavor. But it's not. It's more like "white citrus", or lime and grapefruit or something like that. It might even taste a little "grassy" because it's slightly bitter too. It really doesn't taste that bad, but when you expected it to taste like orange, the flavor will throw you off a little. This is a drink mix that you need to add 4 to 6 oz of water. I think it tastes better when you have less water. It contains 1,000 mg vitamin C, which is 1,667% of daily value in one packet. It also contains a lot of other ingredients like vitamin B6, B12, Zinc, etc. However, the suggested dosage is "take 1 packet 2 to 4 times a day." That concerns me a little because if you do 4 times a day, that's 6,668% daily value of vitamin C. I don't know if you can take too much vitamin C in your system and cause any side effect. Besides, that will cost a lot of money to keep it up in that rate. So how did it work? Well, I am sure the manufacturer will tell you that you need to take this daily to maintain the effect. I can't afford to do that. So I take it when I can find a good deal, and I only take it from time to time (not daily). I am normally healthy and don't get sick often. I haven't gotten sick during the period of time when I take this supplement. So yes, I am willing to believe it did help. I will recommend this product although I don't swear by it. It's something that is nice to have if you can find a good deal.