I've read that vitamin e oil is very helpful in the treatment of cold sores. would it help if i used it daily?

No: Though pretty good for your lips, it won't keep cold sores away. Cold sores erupt in response to physical, thermal and/or emotional stress and in response to illness and changes in medications. If they occur frequently, you can get rx for Valtrex (valacyclovir) for use on a preventive/prophylactic regimen. Best to stay healthy (diet and exercise), wear sunscreen (don't forget lips) and get plenty of sleep.

Maybe: Cold sores often occur when a person's resistance is lower, due to a variety of reasons, even sun damage can bring them about. Try the vitamin e and see if you have improvement. For people who get them often, visit a laser dentist who (without actually touching the sore) can reduce the symptoms and attain quicker healing. Ozonated olive oil applied to the sore has been shown to help.