Notes from the Field: Online Weight Loss Supplements Labeled as Tejocote (Crataegus mexicana) Root, Substituted with Yellow Oleander (Cascabela thevetia) — United States, 2022

Investigation and Outcomes

On September 8, 2022, an emergency physician called the New Jersey Poison Information and Education System (NJPIES) regarding a child aged 23 months who had consumed Eva Nutrition Mexican Tejocote Root and developed nausea and vomiting. The product was marketed as a weight loss supplement and purchased by the patient’s mother. The patient was experiencing age-specific bradycardia (heart rate = 90 bpm; normal range = 98–135 bpm) and was hypotensive (blood pressure = 71/60 mm Hg). Electrocardiogram (ECG) results demonstrated sinus bradycardia, frequent premature ventricular complexes, and scooped ST segments consistent with cardenolide toxicity. At the direction of NJPIES, a serum digoxin assay was obtained with a reported level of 0.5 ng/L, which NJPIES interpreted as being attributable to cross-reactivity with a nondigoxin cardiac glycoside. After receiving treatment with 40 mg of digoxin-specific antibody fragments (FAB, a digoxin overdose antidote), the patient’s ECG and blood pressure normalized. A repeat ECG 12 hours later again demonstrated evidence of cardenolide toxicity. The patient received a second dose of FAB, and the ECG results returned to normal.

Preliminary Conclusions and Actions

Because of the public health concerns of this likely mislabeled product, 10 products labeled as tejocote and marketed as weight loss supplements were purchased by NJPIES online during December 2022. Each product was listed on a separate page, although some carried the same or similar labels. Products were shipped directly to Flora Research Laboratories (Grants Pass, Oregon), which specializes in the analysis of chemical constituents found in dietary supplements. Using ultra-high pressure liquid chromatography–accurate mass-time of flight mass spectrometry analysis, researchers compared the purchased supplements with authenticated tejocote root procured and authenticated results with an ethnobotanist (Trish Flaster, Botanical Liaisons, personal communication, December 2022). Nine of 10 products labeled as tejocote were yellow oleander, with no evidence of tejocote root (Table).

These readily available dietary supplements, upon testing, appeared to be mislabeled. Instead, they contained a toxic substance of concern to both clinicians and public health officials. FDA recently released a consumer warning about toxic yellow oleander purported to be Nuez de la India in certain botanical weight loss products.^† Clinicians need to be aware that persons with signs and symptoms of cardiac glycoside exposure might have been exposed to products labeled as tejocote, Nuez de la India, or other supplements marketed for weight loss and might benefit from treatment with a similar approach to that used in cases of nondigoxin cardiac glycoside exposures. Persons who are exposed to yellow oleander with evidence of toxicity might have a positive serum digoxin result on immune assays caused by cross-reactivity and might respond to FAB, as did the patient in this report. However, higher doses of FAB might be required for the reversal of yellow oleander toxicity than that typically used in cases of digoxin toxicity (3). Serum digoxin assays are not reliable for detection of thevetin B and cardiac glycosides other than digoxin. Laboratory-reported digoxin levels do not accurately reflect serum levels of other cardiac glycosides (4,5). For public health officials, this is concerning because these supplements contain a highly toxic substance and are readily available from multiple retailers. Future prevention efforts need to include reporting products such as these to FDA and alerting retailers who might be unknowingly selling these hazardous products. Clinicians will need to ask persons seeking care with evidence of cardiac glycoside toxicity about the use of weight loss supplements and consider FAB for treatment.