What's Your Best Laxitive?

I'm actually immune to poison ivy. I ate it when I was a kid. Been immune to it ever since. Never had it or any of the rest of it.
I’ve been told that by a few people but to scared to try it. One old lady told me her Indian grandmother told her, she did as a child and it worked never got it again. Her husband got it bad every year, he ate a leaf and NEVER had it since.