Over the years, more than a couple readers have asked about creatine and whether or not it has a place in the Primal Blueprint. People may be tempted to lump it in with anabolic steroids or other chemical enhancers, but they would be conferring guilt by association. To clarify, creatine is a naturally occurring substance involved in ATP energy production. All vertebrates have it, and most of us get a good chunk of our creatine from eating said vertebrates. Red meat in particular – beef, lamb, and bison – contains the highest levels of dietary creatine (interestingly enough, human vegetarians – unlike their ungulate counterparts – generally have far less creatine in their muscles than meat eaters). The rest of the creatine we get is biosynthesized internally from three amino acids (some of which are also derived from diet): arginine, glycine, and methionine.