Fisk og fiskebiologi (Phylogenetics of B12-binders., Vitamin B12 in fish and roe.), Cancer (Folic acid and cancer., STAT3 oncogene., The Interferon system.), Ernæring (Bioavailability., CobaSorb test., Vitamin B12 Food Absorption Test., Vitamin B12 intestinal absorption., Vitamin B12 status during pregnancy and lactation., Vitamin B12 status in patients with PCOS on treatment with metformin.)