Well, yes, vitamin c can be helpful for pink eyes. Generally speaking, pink eye, is an eye infection which will cause the white of the eye to turn red. When you suffer pink eyes because of infection, itching, watering eyes, swollen lids and a thick discharge will occur in some degree. So you need to try some ways to treat it. For example, you can just intake more vitamin c. first you should know that in addition to the benefits to the immune system, vitamin C may also help prevent additional inflammation in the eye. And according to some experts, inflammation of the white of the eye is the reason which can cause the severe redness and then lead to pink eye. So you can take between 250 to 500 mg of vitamin C twice daily, and then it will do a good job to your eyes.