I've never tried aloe vera because my gut generally dislikes most supplements, but I found this National Institutes of Health trial that gave thumbs up to taking oral aloe vera 100 ml per day.
www.ncbi.nlm.nih.gov/pubmed/15043514The only negative is that this sample size is very small. Guess there isn't anyone rushing to do a larger study because aloe vera is not patentable and no drug company will benefit.
Has anyone had bad results from oral aloe vera? I'd like to hear.