I did some research through Google as well and came to the same conclusion as newmitral. There may be a connection, but it is not dramatic. There is anectdotal evidence, but in most of the cases consumption was much higher than what I would consider normal.
I drink a 6 oz glass of juice every day and rotate through a variety of juice never having the same juice back to back. I include cranberry and have seen no problems. I also eat fruit once a day and rotate through a variety including grapefruit. I don't have them back to back and never more than two grapfruit in a week. I have seen no problems.
IIRC the quantitative range of most INR tests is about 0.5 to 5, so any INR level over about 5 is not "real", but certainly over 5.
Worth repeating-------You are wise to consume a daily fruit and/or juice, and you are wise to rotate your choices.
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