Minneapolis St. Paul Mental Health Blog

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Mental Health in Pregnancy

Marijuana risks | THC persists in Breast milk 6 weeks after quitting Cannabis

Delta-9-Tetrahydrocannabinol (THC), the main psychoactive component of cannabis, remains detectable in breast milk even after weeks of abstinence, new data show.

The estimated half-life of THC in breast milk is 17 days, according to the study results, with a projected time to elimination of more than 6 weeks.

The clinical importance of the remaining THC is up for debate, according to some experts.

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