Methylsynephrine, also known as oxilofrine, is a stimulant drug approved in some countries for treating people with low blood pressure, but it is not approved for this use in the United States.

Methylsynephrine, also known as oxilofrine, is a stimulant drug approved in some countries for treating people with low blood pressure, but it is not approved for this use in the United States.

For now, Cohen had this advice for consumers: "If it lists methylsynephrine on the label, avoid it. And more broadly, avoid products marketed as weight-loss or 'workout' supplements.

In a new study, researchers analyzed 27 weight-loss and workout supplements now available on the market that listed an ingredient called methylsynephrine on the label. Methylsynephrine, also known as ...

Cohen found that methylsynephrine was openly listed on some supplement labels. "It's sold as a pre-workout supplement, to get pumped up and have better workouts," he says.

Cohen found that methylsynephrine was openly listed on some supplement labels. "It's sold as a pre-workout supplement, to get pumped up and have better workouts," he says.

For now, Cohen had this advice for consumers: "If it lists methylsynephrine on the label, avoid it. And more broadly, avoid products marketed as weight-loss or 'workout' supplements.

Oxilofrine, also known as methylsynephrine or p-hydroxyephedrine, can stimulate the heart and is useful in some medical situations, such as enhancing heart function in patients under anesthesia ...

The substance, first developed in Europe, is known by several names: methylsynephrine, oxilofrine, and p-hydroxyephedrine, among others. It mimics the effect of amphetamines on the heart, and is ...

"Methylsynephrine does not fit under any of these categories, rendering misbranded any dietary supplements that declare methylsynephrine as a dietary ingredient," according to the letters.

The ingredient, methylsynephrine, acts similarly to amphetamine. It was first developed in Europe, and is not approved in the United States as either a drug or a dietary supplement.

For now, Cohen had this advice for consumers: "If it lists methylsynephrine on the label, avoid it. And more broadly, avoid products marketed as weight-loss or 'workout' supplements.