Primal people tend to assume they have the B vitamins covered. It’s no wonder: punch a slab of beef chuck steak or a few ounces of liver into the USDA nutrient database and that whole B vitamin section seems to fill up.

Let’s take a look. You may be right. You may be totally fine. But it’s always nice to refresh your focus.

(This Mark's Daily Apple article was written by Mark Sisson, and is narrated by Tina Leaman)