Karen Pendergrass is the founder of Heavy Metal Facts, co-founder and CEO of the Paleo Foundation, and founder of Microbiome Medicine and the Microbiome Signatures Database. Her work focuses on translating complex contaminant science and microbiome research into accessible, evidence-first reporting and actionable frameworks for consumers, brands, regulators, clinicians, and researchers.
Background
Pendergrass is a standards developer, research strategist, and translational microbiome scientist whose career bridges the gap between bench research and real-world application. She works at the intersection of the gut microbiome, trace metals, and chronic disease — specializing in heavy metal exposure pathways, microbial metallomics, food safety certification, and standards-minded journalism. Her scientific approach favors systems-level thinking over traditional reductionist biology, and she routinely emphasizes the need for causal inference tools such as the Bradford Hill criteria in clinical microbiome research.
Certification and Standards
As co-founder of the Paleo Foundation (est. 2010), Pendergrass developed the world's first certification standards for Paleo, Keto, and Grain-Free products — standards now used globally by food manufacturers and retailers as industry benchmarks. She also established the Heavy Metal Tested and Certified™ program, an independent third-party testing and certification framework for CPG brands and retailers. The program sets category-specific contaminant limits based on consumption-based exposure modeling, ALARA principles, and statistical risk matrices for food, supplements, and personal care products.
Microbiome Signatures Database
Pendergrass is the architect behind the Microbiome Signatures Database, a clinician- and researcher-facing platform designed to formalize disease-associated microbiome patterns through Major Microbial Associations (MMAs). The database facilitates intervention development using a structured Microbial Shift and Realignment Process (MSRP), where interventions must both restore taxa altered in disease-specific microbiome signatures and yield clinical improvement — co-validating the intervention and the underlying microbial signature. It is evolving into a translational tool for guiding precision prebiotic, probiotic, phage, dietary, and microbiome-targeted interventions (MBTIs).
Pioneering Work in Microbial Metallomics
Pendergrass has led foundational work integrating trace metal analysis into microbiome research, introducing microbial metallomics as a critical lens for interpreting pathogen virulence, microbial selection pressure, and nutrient-immune interactions in chronic diseases. Her metallomic research focuses on the differential acquisition, utilization, and detoxification of trace elements — including nickel, zinc, iron, cadmium, lead, and aluminum — among taxa enriched in disease states. This work has yielded novel hypotheses for conditions including endometriosis, multiple sclerosis, and polycystic kidney disease, contributing a mechanistic framework to explain microbial persistence and immune evasion in metal-laden tissues.
Origin Story
Pendergrass's research trajectory was catalyzed by a personal health crisis involving multiple chronic conditions, which she later linked to complex microbiome disruptions and trace metal dysregulation. In 2009, after struggling to find trustworthy food products while following a Paleo diet, she and co-founder Kimberly Eyer left their respective commitments — Karen left college one semester before graduation, and Kimberly left her job and sold her house — and moved to Los Angeles to start the Paleo Foundation on January 1, 2010. That lived experience informs a deep commitment to scientific integrity, patient-centered innovation, and the development of research and regulatory tools that address real-world clinical gaps.
Mission
Pendergrass's work exists at the nexus of microbiome signatures, metallomics research, clinical intervention, and regulatory strategy. Her goal is to accelerate the responsible translation of emerging science into standards, databases, certifications, and frameworks that clinicians, researchers, and industry leaders can trust and operationalize — with the aim of effectuating consumer-driven change in the heavy metal and microbiome medicine landscapes.