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Recently, a high number of companies have emerged that offer online direct-to-consumer DNA testing. We investigate these consumer genomics companies through the lens of identity. We find that many of them appeal to a kind of “genetic essentialism”. We suggest that this appeal is key to understanding why consumers are attracted to their services. There seem to be three very different currents within contemporary culture at work: the pre-modern search for a naturalistic understanding of identity, the modern enthusiasm for science, and the post-modern emphasis on radical individual self-determination. The support for our hypothesis comes from the companies’ websites and the online testimonials of satisfied customers. We discuss the risk of distortion of the subjective experience of identity due to unreliable or uninformative test results, inadequate or misleading explanation, and the fact that the science is still too weak to yield meaningful results.