ALDH2 rs671 Explained: Alcohol Flush and Drinking Risk

Apr 18
2 min read

Updated: Aug 2

ALDH2 rs671 is one of the most important alcohol-related genetic variants in consumer DNA analysis. It affects how efficiently your body clears acetaldehyde, the toxic byproduct formed after alcohol is broken down [R]. When ALDH2 activity is reduced, acetaldehyde can build up more easily after drinking, which is why this SNP is strongly linked to alcohol flush, low alcohol tolerance, and a different risk profile than people with normal ALDH2 activity [R].

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