According to the Mayo Clinic website, the recommended daily dose of vitamin C should be 65 to 90 miligrams a day. The upper limit is 2,000mgs. Megadoses of vitamin C can cause diarrhea, vomiting, insomnia, headaches and kidney stones.
Have you had any medical issues ? If you haven't had any unusual health issues, you're probably fine. There was a time when it was thought that taking fist fulls of vitamins was healthy. Today, with more research we know that isn't true. Megadoses of vitamins can be detrimental to our health.
If you are concerned, talk to your doctor and get a blood test done. Your doctor will let you know if you're taking too much or not.
A person should be getting more of their vital nutrients (like vitamins) from the food they eat. A vitamin is a supplement a person takes if they have a nutritional deficiency. if you eat plenty of fresh fruits and veggies, it's doubtful that you need the extra vitamin.
Linus Pauling is the father of the vitamin C movement. He was a brilliant scientist, but some of his work has been called into question. www.quackwatch.com/01QuackeryRelatedTopics