If you search this forum for "vitamin c" I think you will find it. I have heard several people state that really high vitamin c is good for you as long as your adrenals are healthy. If you are recovering, a lower dose, 500-1000mg, maybe, for example, would be better. I read that and then did my own experimentation.
I have pretty frequent urination normally, but when I did 5 days of high vitamin c, 3000 mg supplementation, it exacerbated the frequent urination. Every drop of liquid was going right through me.
This relates to Aldosterone, a hormone produced by the adrenals. I was low before high dose vitamin c, it got really low during vitamin c, and it's now back to normal after I leveled off the c.