Joy Kong, MDRegenerative Medicine Physician, Educator, and Entrepreneur

60% of Women Carry Someone Else’s DNA

12 Mar 2026 · 0 min

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In this brief interview, Dr. Joy Kong addresses concerns that receiving stem cells from another person might alter a recipient’s DNA. She emphasizes the minuscule proportion of donor cells relative to the body’s 37 trillion cells, explaining that most transferred cells are either eliminated by the immune system or, in rare cases, integrate into the host. Kong cites microchimerism—specifically that about 60 % of women carry male (Y‑chromosome) cells—as evidence that DNA exchange naturally occurs between humans. She argues that because such exchange is already part of normal human experience, the fear of foreign DNA from medical procedures should be greatly reduced.

If people are so afraid of other people's DNA in your body, then please stop having sex and stop kissing each other.
When someone receives stem cells from another person, does that actually change anything about their own DNA?
We have 37 trillion cells in our body. Even if I give you 500 million, it's a drop of water in the ocean. And there are two fates with these cells. They can be attacked by the recipient's immune system. And it could be killed. You don't have to worry about anymore. The cell is gone. Or another fate is that it adapts to the body. Even between human and animals, there's a chance of integration. So you can imagine between human and human, there's definitely a chance of integration. 60% of women have Y chromosomes in their body. So if you already have DNA exchange among human beings as part of the human experience, then really how much should you be afraid