What are the more unusual longevity-related metabolomics/proteomics/blood tests that you do? Any results?

eg
https://www.sciencedirect.com/topics/medicine-and-dentistry/deoxypyridinoline

some later in https://www.youngplasmastudy.com/?wix-vod-video-id=473ac9384acf4a7c971eb1479bb87824&wix-vod-comp-id=comp-jz1gyte6

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Blood viscosity (high ferritin). Mike Mutzel discusses it here. Donating Blood to Reduce Blood Viscosity, Iron Overload & Cardiometabolic Disease Risk (new science) - YouTube

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