vitamin c is a water soluble vitamin.
excess vitamin c is easily excreted by the body.
so it is not easy to overdose and cause toxic effect on the body.
1 pill of 1000mg vitamin c is fine

you misunderstood. i was talking about vitamin c clearance not absorption. but anyway :
vitamin c is well absorbed by the body. in fact almost 1000mg will be absorbed if taken.

correct. that is the daily requirement of vitamin c.
daily requirement is the minimum required to keep us healthy.
when we are ill, increased intake of vitamin c stimulates many of the body's system so that we get healthy faster.

the current upper safe intake is 2000mg. 1 of the sign of vitamin c toxic effect is diarrhea.