Hvorfor teller de ikke med de vitamin fra kjøtt?
Another reason is that animal foods contain some 25(OH)D. This form of vitamin D is not included in intake surveys and is considerably more potent than vitamins D2 or D3 at raising serum 25(OH)D levels [42].
https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/#h8