Function Health

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Function Health, often stylized as simply Function, is an American company and platform headquartered in Austin, Texas. The venture capital-backed company offers blood testing services. The company was co-founded by Mark Hyman, Pranitha Patil, Mike Nemke, Seth Weisfeld, Jonathan Swerdlin and Daniel Swerdlin. The company offers a membership-based health platform with direct-to-consumer blood testing, urine testing (21 tests), for a total of 160 tests, along with AI-generated reports and cross-promotion of supplements, with an option of adding full-body MRI and CT scans. The company was valued at $2.5 billion in its last financing round in November 2025. Function Health was founded in 2021 by Mark Hyman, Pranitha Patil, Mike Nemke, Seth Weisfeld, Jonathan Swerdlin and Daniel Swerdlin. According to co-founder Mike Nemke, he connected with Pranitha Patil in 2021 after seeing her online post seeking a technical co-founder, then met Jonathan Swerdlin and began collaborating with the team. In 2023, Function Health completed more than three million lab tests. As of 2024, the company had at least 100,000 members and a waitlist of 200,000. That same year, Hyman stated there were over a million data points on Function Health’s first group of 10,000 people.