Banned stimulant Oxilofrine found in many weight loss supplements

Posted 02 May 2016

According to a new study, a banned pharmaceutical stimulant called oxilofrine was found in over 50% of tested supplements that listed methylsynephrine on the product label. Oxilofrine is a pharmaceutical drug developed in Europe to stimulate the heart. It has never been approved for use as a prescription drug or dietary supplement ingredient in the United States.

Of the 27 supplement brands tested, 14 tested positive for oxilofrine. Among the products with the highest quantities were Hyperdrive 3.0+ by ALR Industries Inc and Fastin by Hi-Tech Pharmaceuticals. Six of the tested products contained pharmaceutical doses or greater amounts of the stimulant. The authors noted that if consumers followed the instructions provided on the product labels, they could potentially take up to 250 mg of oxilofrine daily.

[Source: Integrative Medicine Newsletter]


Cohen PA, Avula B, Venhuis B, et al. Pharmaceutical doses of the banned stimulant oxilofrine found in dietary supplements sold in the USA. Drug Test Anal. 2016 Apr 7.


Oxilofrine (4-[1-hydroxy-2-(methylamino)propyl]phenol) is a pharmaceutical stimulant prescribed in dosages of 16 to 40 mg to stimulate the heart and increase blood pressure. It has never been approved for use in the USA as a prescription drug or as a dietary supplement. Several athletes, however, have been banned from sport for testing positive for oxilofrine and have claimed that they inadvertently consumed oxilofrine in sports supplements. Consumption of supplements containing oxilofrine may also pose serious health risks. For example, one brand of supplements containing oxilofrine has been linked to serious adverse events including vomiting, agitation, and cardiac arrest. We designed our study to determine the presence and quantity of oxilofrine in dietary supplements sold in the USA. A validated ultra-high performance liquid chromatography-quadrupole time of flight-mass spectrometry method was developed for the identification and quantification of oxilofrine. The separation was achieved using a reversed phase column, mass spectrometry detection, and a water/acetonitrile gradient as the mobile phase. The presence of oxilofrine was confirmed using a reference standard. We analyzed 27 brands of supplements labelled as containing a synonym of oxilofrine (‘methylsynephrine’) and found that oxilofrine was present in 14 different brands (52%) at dosages ranging from 0.0003 to 75 mg per individual serving. Of the supplements containing oxilofrine, 43% (6/14) contained pharmaceutical or greater dosages of oxilofrine. Following instructions on the label, consumers could ingest as much as 250 mg of oxilofrine per day. The drug oxilofrine was found in pharmacological and greater dosages in supplements labelled as containing methylsynephrine.

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