I have found that aloe vera is one of the best things I have found for constipation. I am aware of the potential side effects of taking too much, so only use a small amount every day.
I drink a few ounces of aloe vera juice every morning when I get up. If I am faithful at doing this every day, I can avoid getting constipated.
If I am going to be traveling, I make sure and take a few ounces both morning and evening to avid getting constipated on the road. Using aloe vera like this has worked better than anything else I have tried for my constipation.