1,666pcd of vitamin c?

Too much vitamin C can cause diarrhea and gastrointestinal upset.* Some reports claim that* prolonged overdose of vitamin C can lead to birth defects, genetic mutation, kidney stones, oxidative stress and cancer, but these are not commonly accepted right now.

It's very, very unnatural to be taking such high quantities of vitamins in my opinion. You must have the most expensive urine in the world.

A healthy diet is way more important. Food is the means your body is designed to accept vitamins from, and in smaller quantities for a reason.