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I've watched colleagues offer it at longevity clinics — including at Extension Health in New York, where Parsley has a partnership. I've been curious. I've also been skeptical.

For a long time, I didn't know what to tell people. Not because I hadn't looked. Because the data wasn't there. No solid before-and-after testing. No proof it moved the needle on symptoms or longevity markers. Just a very expensive, time-consuming procedure and a lot of hope.