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I don’t know if anyone has info on this or not, but here goes. I’ve looked through the internet and couldn’t find anything. Does anyone know if taking lithium can affect. DTC (direct to consumer) DNA testing (Ancestry, etc.)? I’ve read some chemo meds may affect it, and that things such as denture adhesive can affect the quality but not change the test. What about lithium? Just asking since my results do show DNA matches at 2nd-3rd cousins on both maternal and paternal lines and way beyond but nothing on people closely related to me who’ve also tested. I’m certainly related to my parents given other DNA matches but even a maternal full uncle shows as a cousin and a paternal full uncle (dad’s paternal twin) and his daughter (my first cousin) don’t show at all, although I have matches with all the people who’ve tested a couple more generations back. Weird. Can’t find anywhere if lithium (all I currently take for BP) is doing something weird to my DNA showing less cMs or if I just am an anomaly. Lol. *correction: oops - I meant dad’s FRATERNAL twin.