Indigenous populations in Tanzania, such as the Maasai and Hadzabe, have some of the highest recorded mean serum 25(OH)D levels, with studies reporting averages over 106 nmol/L, and pregnant Maasai women averaging up to 138.5 nmol/L.
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Note that 138.5 nmol/L is 55.5 ng/ml. Source:
https://www.grassrootshealth.net/project/ng-ml-nmol-l-converter/
Great catch! Thank you for pointing it out