Accutane vs. Vitamin A Supplements

Hi, I'm contemplating whether to do another course of accutane as it's the only thing that has ever worked to clear up acne. I know there are potential side effects so wanted to find out if taking Vitamin A supplements in capsule form could be used as an alternative to going back onto Accutane. I understand there is danger of Vitamin A toxicity so wanted to find out how Vitamin A supplements compare to Accutane capsules in terms of dosage/amount of Vitamin A. Thanks