Herbs such as pepper increase the bioavailability of vitamin D, etc

Science Shows Herbs Can Significantly Enhance Bioavailability of Nutrients GreenMed Info Sept 2014

Pepper - (does not indicate how much increase)

Vitamins (water soluable)

Vitamin B1, Vitamin E2, Niacinamide, Vitamin B6, Vitamin B12, Folic acid, Vitamin C

Vitamins (fat soluable)

Vitamin A, B-Carotene (provitamin), Vitamin D , Vitamin E, Vitamin K

Amino Acids

Lysine, Isoleucine, Leucine, Threonine, Valine, Tryptophan, Phenylalanine. Methionine

Minerals

Iodine, Calcium, Iron, Zinc, Copper, Selenium, Magnesium , Potassium, Manganese

Does show quantitative bioavailability increases by other herbs - but not to Vitamin D

Does have detailed references - exampli is attached at the bottom of this page