Two years ago, Kristi Wood was tired and achy and could not think clearly, and she had no idea why.
“I was in a fog and feeling awful,” said Ms. Wood, 49, who lives in Seattle and is an owner of a hiking supply company.
Ms. Wood had her blood tested by a consumer service called InsideTracker, which analyzes 30 hormones and biomarkers, such as vitamin levels, cholesterol and inflammation. After the service told Ms. Wood she had excessive levels of vitamin D, she cut back on a supplement she had been using and said she almost immediately felt better.
Now she has her blood drawn and tested by InsideTracker every four months to check everything from her blood sugar to her B12 levels which, she said, “allows me to be proactive” about her health. The services typically send their customers to a nearby clinic where they can have a vial of their blood drawn and…