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Both marjoram and oregano are too irritant on the urinary tract and shouldn't be in a kidney tea. Any tea that includes marjoram should be your last choice. It's not soothing at all. But with so many kidney formulas out there you do have choices. Vendors that didn't come up with a formula but simply manufacture it to someone else's specifications are doubly redoubtable. They won't be able to properly answer your queries. That's why I'd tell you to avoid Moritz' haphazard, industrial-strength, unbalanced combo. It's prompted many questions from users now on the CZ archives. Go with reputed herbalists like Schultz instead, with a better grasp on herbs' gentle but firm powers. He's been in the business long enough and knows what he's doing. Tweet