I have been using this stuff for many years. I drink 1 or 2 every morning, depending on how I feel. The price on amazon for the Super Orange is cheaper than Wal- Mart (and saves me from going into a Wal-Mart...thank the Lord). I also added this to my subscribe and save, so I get even more savings. I am a vegetarian and use this to get my B vitamins, which are particularly hard for vegetarians to get without supplementing. I prefer the powder form as it is more readily absorbed. Super Orange is my favorite flavor; the others are too sweet for me. I like to briefly warm about 6 oz of water and then add my 1-2 packs. I feel that it dissolves better in slightly warm water. Vitamin C and B vitamins are water soluble. If you ingest more than you need, you will just pee them out. Although excessive Vitamin C can cause Diarrhea, so be alert to that. If you notice your pee is a bright yellow, you probably have taken in more B12 than you need. This never happens to me so I know 1-2 packs per day is suitable for my needs. In the past when I drank Red Bull, my pee would be a neon yellow, and fairly rapidly. Interestingly, Red Bull provides 80% of your RDI for B12, while this product contains 417% leading me to suspect that the form of B12 in Red Bull is not readily absorbed. I have to add (since I am a dietitian and I couldn't write this review in good conscience without doing so) that I do not recommend using Red Bull for your pick-me-up. I just mentioned it to discuss the quality of the Emergen-C supplement. But this is not a review for Red Bull, so I'll leave it at that. If you found this review helpful, please feel free to hit "Yes". Thank you