Liver contains about half of the B vitamins not found in robust amounts in muscle meat.

“liver and egg yolks are like the complementary b vitamins to the b vitamins and muscle meat like half of the b vitamins are in muscle and the other half are in liver and egg yolks”

“it's particularly rich in many of the nutrients that complement muscle meat it's quite interesting there's about half the B vitamins and robust amounts and muscle meat and the other half are in the liver so you get b6 is pretty good and muscle meat folate is pretty good in liver”

“i purposely left out muscle meat from both of those conversations about folate and riboflavin because muscle meat doesn't have nearly as much riboflavin as organ meats like heart and liver and muscle meat really doesn't have much folate at all”