I also LOVE, LOVE Vitamin C! I'm a fanatic (that's a warning)! Haha!!
Personally, I always buy the 1000 mg version and ALWAYS have a bottle or 4 as backup. As a minimum, I'll take 2-3 capsules daily; but if I have something going on that my body needs to push out or get rid of, I've been known to take 8000 mg. (I am not a doc and do not recommend anybody taking the same amount I'm taking without consulting a doc or doing your own research.)
So, this is a brand that I will ALWAYS buy from and Vitamin C should be in everybody's house! Go get some now!!