MyNeanderthal DNA: What Your Percentage Actually Means
"How much Neanderthal DNA do I have?" is one of the most common questions people ask after any DNA test that reports on deep ancestry. The short answer: if your ancestry isn't predominantly sub-Saharan African, you almost certainly carry some — most non-African people carry roughly 1-2% Neanderthal DNA, a genetic leftover from interbreeding that happened tens of thousands of years ago.
| Typical range (non-African) | Roughly 1-2% of the genome, up to about 4% in some individuals |
|---|---|
| Typical range (sub-Saharan African) | Near zero, though some later back-migration into Africa introduced trace amounts in parts of the continent |
| When interbreeding happened | Roughly 50,000-60,000 years ago, as Homo sapiens migrated out of Africa into Eurasia and encountered Neanderthal populations |
| Key research | The Neanderthal genome was first sequenced by a team led by Svante Pääbo at the Max Planck Institute, published in 2010; Pääbo received the 2022 Nobel Prize in Physiology or Medicine for this and related paleogenomics work |
Why almost everyone outside Africa has some
Neanderthals lived across Europe and western Asia for hundreds of thousands of years before going extinct roughly 40,000 years ago. When early Homo sapiens migrated out of Africa, they encountered and interbred with Neanderthal populations already established in Eurasia. Because that interbreeding happened after the ancestors of modern Africans and non-Africans had already diverged, the Neanderthal DNA mixed into the population that went on to populate Europe, Asia, and eventually the Americas and Oceania — while populations that stayed in sub-Saharan Africa were largely unaffected, aside from later, more limited back-migration.
What the percentage does and doesn't tell you
Your reported percentage is a genome-wide average, but it doesn't mean your Neanderthal DNA is spread evenly across your chromosomes — it's concentrated in specific segments, and which segments you inherited matters more than the headline number. Two people can both show "2% Neanderthal" and carry almost entirely different stretches of Neanderthal-derived DNA, inherited through completely different ancestral lines. This is also why percentages can vary slightly between testing companies: different reference panels and detection algorithms will flag slightly different segments as Neanderthal-derived.
Does it affect anything about me?
Research has linked specific Neanderthal-derived gene variants to a range of modern traits and health-related outcomes, including skin tone, hair characteristics, some aspects of immune response, and altered risk for certain conditions — though this is an active and still-developing area of research, and no single trait can be attributed to Neanderthal ancestry with certainty from a consumer test alone. The variants you carry, not just your overall percentage, are what would matter for any of this, and most consumer reports don't break results down to that level of detail.
How this differs from your Ancient Origins percentages
Neanderthal ancestry is a fundamentally different kind of measurement than the population-level breakdowns covered elsewhere on this site, like Bronze Age Steppe or Hunter-Gatherer ancestry. Those categories compare your DNA to Homo sapiens populations from the last 10,000 or so years. Neanderthal ancestry instead reflects interbreeding with an entirely separate hominin species tens of thousands of years further back — it's a story about the deep origins of Homo sapiens as a whole, not about which historical human population your ancestors belonged to. See our ancient DNA explainer for more on how these different timeframes fit together.
Denisovan DNA: the other archaic ancestor
Neanderthals aren't the only extinct hominin group that interbred with early Homo sapiens. A separate, more recently discovered group called Denisovans left their own genetic trace, concentrated in different modern populations than Neanderthal DNA. See our Denisovan DNA explainer for how that ancestry compares.
Which companies report Neanderthal DNA percentage?
Several major consumer DNA testing companies include a Neanderthal ancestry estimate as part of their standard or premium reports; availability and presentation vary by provider, and it's usually calculated separately from ancient-origins features like MyHeritage's Ancient Origins. Check your specific provider's report list to see whether it's included.
Can two siblings have different Neanderthal DNA percentages?
Yes. Because DNA is inherited randomly in roughly half-shares from each parent during reproduction, full siblings can inherit somewhat different amounts and segments of Neanderthal-derived DNA, even though they share the same parents and the same deep ancestral history.
Is a higher Neanderthal DNA percentage good or bad?
Neither, on its own. A higher or lower percentage isn't a health verdict or a marker of anything positive or negative by itself — it simply reflects how much Neanderthal-derived DNA you happened to inherit through your specific ancestral lines. Any potential trait or health associations depend on which specific gene variants are involved, not the percentage alone.