23andMe & raw DNA
Download, read, and privately interpret your 23andMe raw data — guides, tools, and gene-by-gene how-tos.
ACTN3 rs1815739: the 'sprint gene'
What the ACTN3 rs1815739 variant — the so-called 'sprint gene' — actually is, how to find it in your 23andMe or AncestryDNA raw data, what the three genotypes are associated with, and why it is not a test of athletic ability.
ALDH2 rs671: the alcohol flush variant
What the ALDH2 rs671 variant (alcohol flush reaction) means, how the alcohol-metabolism pathway works, how to find rs671 in your 23andMe or AncestryDNA raw data, and why the flush is an evidence-based reason for moderation.
COMT rs4680: the 'warrior vs worrier' gene in your raw data
What the COMT rs4680 (Val158Met) variant really means, how to find it in your 23andMe or AncestryDNA raw data, and why the 'warrior/worrier' story is more pop science than science.
CYP1A2 rs762551: fast or slow caffeine metabolizer?
What the CYP1A2 rs762551 variant means for how you process caffeine, how to find it in your 23andMe or AncestryDNA raw data, why fast vs slow metabolizer is only part of the story, and how to experiment sensibly.
CYP2C19 in your raw data: how you metabolize certain drugs
What the CYP2C19 variants in your 23andMe or AncestryDNA raw data mean for how you metabolize medications like clopidogrel, PPIs, and some antidepressants — why raw data is not clinical-grade, and why any medication question belongs with a doctor or pharmacist.
Factor V Leiden (rs6025) in your raw data
What the Factor V Leiden rs6025 variant means for blood clotting, how to find it in your 23andMe or AncestryDNA raw data, why it's a risk factor rather than a diagnosis, and when to talk to a clinician.
Is lactose intolerance genetic?
Is lactose intolerance genetic? Largely yes — a regulatory variant near the LCT gene decides whether you keep digesting lactose as an adult. Here's the MCM6/rs4988235 story, why genotype isn't the same as symptoms, and how to check your raw data.
Is there an "obesity gene"? FTO, explained
FTO is the closest thing to an 'obesity gene' — but it's a small nudge, not destiny. What FTO (rs9939609) does, why one variant explains so little, how much lifestyle offsets it, and how to check yours privately.
VDR variants in your raw data (FokI, BsmI)
What the VDR vitamin D receptor variants (FokI rs2228570, BsmI rs1544410) in your 23andMe raw data mean, why the evidence is mixed and modest, how to find them, and why a blood test — not a genotype — tells you your vitamin D.
How to download your AncestryDNA raw data
A step-by-step guide to downloading your AncestryDNA raw data file — where to find it, what format it's in, and how to analyze it privately on your own device.
23andMe raw data: the complete guide to reading and analyzing it
The complete guide to 23andMe and AncestryDNA raw data: what it is, the file format, how to download it, what you can and can't explore, the coverage and accuracy limits, the tools landscape, and how to analyze it privately on your own device.
APOE4 and your 23andMe raw data: how to check your status
How to read APOE4 in your 23andMe raw data using rs429358 and rs7412, what the e2/e3/e4 alleles mean for Alzheimer's and heart risk, and why an e4 allele is a risk factor — not destiny. Educational only; genetic counseling recommended.
Best tools to interpret your 23andMe raw data (2026)
A balanced, non-diagnostic comparison of the best 23andMe raw data tools in 2026 — Promethease, Genetic Genie, SelfDecode, GenomApp and more — grouped by category, with the accuracy and privacy caveats that apply to all of them, plus a privacy-first on-device option that never uploads your DNA.
How to find your blood type in 23andMe raw data
23andMe doesn't report blood type, but you can often infer it from your raw data. Here's how the ABO and RHD genes work, which SNPs to look up, how genotype maps to A, B, AB, O and +/−, and why it's never a substitute for a real blood test.
BRCA1, BRCA2 and your 23andMe raw data: what it can (and can't) tell you
23andMe raw data covers only a few BRCA1/BRCA2 variants. Learn what it tests, why a negative result is never an all-clear, and when to see a genetic counselor.
Hemochromatosis and your 23andMe raw data: checking HFE variants
How to check your hemochromatosis 23andMe raw data for the HFE variants C282Y and H63D, what the genotypes mean, why penetrance is low, and why iron studies confirm it.
How to download your MyHeritage DNA raw data
A step-by-step guide to downloading your MyHeritage DNA raw data file — where the Manage DNA kits menu lives, what's inside the file, common download problems, and how to analyze it privately on your own device.
MTHFR and your 23andMe raw data: how to find and understand it
How to find your MTHFR variants in 23andMe raw data — the C677T (rs1801133) and A1298C (rs1801131) markers — what the genotypes actually mean, and why major genetics bodies advise against routine MTHFR testing.
What your 23andMe raw data reveals about your health
What 23andMe raw data health insights you can actually learn — disease-risk markers, carrier status, medication response, and wellness traits — explained calmly, with the caveats that matter.
How to download your 23andMe raw data
A clear step-by-step guide to downloading your 23andMe raw DNA data file, what the file contains, and how to read and interpret it privately on your own device.