Articles by Jonathan Toker, PhD

At or above 10 percent of all supplements that do not undergo regular banned substance testing were found in numerous studies to contain banned performance enhancers.

Slowtwitch science editor Jonathan Toker is slowly morphing from elite triathlete to elite sky runner. Sky Running’s “Kona” are the French and Swiss Alps, where you’ll often find Mr. Toker these days.

In the United States, the Food and Drug Administration (FDA) is responsible for protecting and promoting public health with ultimate oversight of food and drugs, and of particular interest for this article, the nutritional supplement industry. Their regulatory control covers two main areas: product safety and accurate product labeling. This article summarizes some of what goes on behind the scenes to keep consumer products safer.

The annual update to the World Anti-Doping Agency (WADA) prohibited substance list was published on October 1st and will be effective on Jan. 1, 2012. Each year WADA updates the list in accordance with evolving scientific principals, changing social habits and increased understanding of what constitutes an ergogenic substance or process.

Eating lots of broccoli can only take one so far. How does one go about gaining quantitative insight into the nutritional state of the body? Enter the latest high-tech and exhaustive performance nutrition testing.

Slowtwitch science editor and SaltStick founder Jonathan Toker offers this guide for all the would be inventors who’ve had that “A-ha!” moment and were left wondering, “Now what do I do?”

Concerned consumers have been returning certain protein drinks, while affected manufacturers have been working overtime to refute the Consumer Reports study. Let’s separate truth from confusion.

Without thinking, some of the athletes taking the outside line put themselves at a disadvantage by running further. Over a common race course with turns, taking the outside line can make quite a difference.

WADA has updated its list of banned substances for 2010. There are notable changes to last year’s list and, if you’re an AGer, don’t think this doesn’t apply to you.

Was the recent death at Ironman Frankfurt a case of drinking too a schedule instead of to thirst, or not ingesting enough electrolytes per the water intake?

In a study just released, trace amounts of steroid ingestion can trigger a positive drug test, illustrating the ease by which athletes can end up on the wrong side of anti-drug programs.

Our science editor, Jonathan Toker, traveled to the Galapagos Islands. Alas, he did not unearth the mystery of how triathletes evolved. But he did see some pretty neat stuff