Microbiome testing in Europe: navigating analytical, ethical and regulatory challenges

Area of Science:

• Human microbiome research
• Direct-to-consumer (DTC) health testing

Background:

• The human microbiome significantly influences health, driving consumer and healthcare interest.
• Companies offer microbiome testing services directly to consumers and via medical labs.

Purpose of the Study:

• To evaluate the consumer experience and quality of direct-to-consumer microbiome testing services.
• To identify limitations and challenges in current microbiome testing kits.

Main Methods:

• A single fecal sample was sent to six international microbiome testing companies.
• Results were analyzed and discussed by a panel of 21 international experts.
• Expert opinions on kit methodology, results, and regulatory status were gathered.

Main Results:

• Identified issues include over-promising claims, lack of methodological transparency, and unreliable results.
• Expert consensus: interpretations and recommendations are premature due to limited scientific evidence and clinical utility.
• Regulatory ambiguity exists, necessitating a distinction between consumer curiosity kits and in vitro diagnostic (IVD) kits.

Conclusions:

• Recommendations are proposed to enhance the quality and robustness of microbiome testing kits.
• Key areas for improvement include standardization, scientific evidence, biomarker validation, and clear regulatory frameworks in Europe.
• Addressing these issues is crucial for aligning laboratory practices with societal needs and clinical application.