The star told the March issue of Harpers Bazaar: "There were a couple of times when I thought 'I'm just gonna stop doing it. People are so mean to me. I don't want to do it.'"
"But then I was like, 'Who cares what some lame person out there says?' I was in Italy once, and this old man came up to me and said, 'I had the best time in Nashville because of Goop.' And that is so worth it to me."
Gwynnie launched the newsletter in September 2008 and, each month, it focuses on a subject area, split into sections: Make, Go, Get, Do, Be, and See. Some critics have suggested it is pretentious and out of touch.
But the Hollywood A-lister has harsh words for those who don't like it:
"Any time you do anything with any degree of sincerity, people make fun of you. That's totally fine. I don't care. I don't read any of it. My thing with Goop has always been, if you don't like it, then don't log onto it."
What do you think of Goop? A useful, insightful and stylish guide to life? Or out-of-reach, inaccessible baloney? Let us know in the comments box below.