Vitamin D-fortified cooking oil is an effective way to improve vitamin D status: an institutional efficacy trial.
Bahareh NikooyehAzizollaah ZargaraanAli KalayiNastaran ShariatzadehMaliheh ZahediradAli JamaliMarzieh KhazraieBruce HollisTirang R NeyestaniPublished in: European journal of nutrition (2019)
Clinicaltrials.gov: NCT03826654.