Since this is real whole food from nature, it is not possible to have an accurate measure of the DOA content and B vitamins per serving.  We would recommend to start with 3 capsules 10 minutes before consuming histamine rich foods.  You may increase to 6 as needed.
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Codeage Beef Kidney is a high-quality superfood and dietary supplement made of grass-fed pure bovine kidney. Beef kidney offers proteins that are found exclusively in the bovine kidney. Codeage Beef Kidney also contains kidney specific peptides, enzymes, cofactors and micronutrients to help support your own kidney health.*

Let us know if you have anymore questions and don't hesitate to contact us on our website.