Thorne

Thorne is the supplement brand healthcare practitioners dispense by name. Founded in 1984 in Sandpoint, Idaho (now headquartered in Summerville, SC), Thorne has built a 40-year reputation on practitioner-grade formulation — no binders, no coatings, no fillers, no magnesium stearate, no anything that could impair absorption or trigger sensitivities.

Thorne's customer base is unusual. The brand sells primarily through licensed healthcare professionals — physicians, naturopaths, nutritionists, functional medicine clinics — rather than through retail. According to industry surveys, Thorne is the most-dispensed supplement brand among 30- to 40-year-old healthcare practitioners in the United States, and the official supplement partner of 11 US National Sports Teams.

The other distinguishing feature is NSF Certified for Sport. NSF is the strictest third-party certification available for athletic supplements — products are tested for nearly 300 banned substances on the WADA prohibited list. Thorne has the largest NSF-Certified for Sport catalog in the industry, which is why every major US national sports federation uses them.