Serum 25-hydroxyvitamin D status of vegetarians, partial vegetarians, and nonvegetarians: the Adventist Health Study-2.
Chan J, Jaceldo-Siegl K, Fraser GE.
Am J Clin Nutr. 2009 May;89(5):1686S-1692S. Epub 2009 Apr 1.
PMID: 19339396
Conclusions: s25(OH)D concentrations were not associated with vegetarian status. Other factors, such as vitamin D supplementation, degree of skin pigmentation, and amount and intensity of sun exposure have greater influence on s25(OH)D than does diet.