The U.S. Food and Drug Administration (FDA) has announced a recall of a popular weight loss supplement after laboratory tests revealed the presence of two undeclared ingredients, one of which is a toxic chemical commonly used as a pesticide.

The recall, initiated by Ana Salazar Modela Tu Cuerpo Inc., affects all lots of Lipofit Extreme 2.0 Fat Burner, which was sold online nationwide. The company acted after an FDA analysis determined that the product's daytime (AM) tablets contained undeclared fluoxetine, a prescription antidepressant, while the nighttime (PM) tablets contained undeclared 2,4-dinitrophenol (DNP), a substance often used in industrial applications and as a pesticide.

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Consumers who have purchased the supplement are urged to stop using it immediately and to return it to the place of purchase for a refund. The FDA warns that DNP is not safe for human consumption and can cause serious health risks, including rapid metabolism, hyperthermia, and even death.

This is not the first time the agency has flagged the product. In June, the FDA issued a public warning advising consumers not to buy Lipofit Extreme 2.0 due to the presence of the same undeclared ingredients. The recall notice, shared on Tuesday, makes the action official and expands the scope to all batches.

The discovery of undeclared pharmaceutical ingredients in dietary supplements has become a growing concern for regulators. Fluoxetine, the active ingredient in Prozac, is a selective serotonin reuptake inhibitor (SSRI) that can have dangerous interactions with other medications. Its presence in a weight loss supplement without a prescription raises serious safety issues.

DNP, on the other hand, is a metabolic poison that was once used as a weight loss drug in the 1930s but was banned due to its severe side effects. Its use in any consumer product is strictly prohibited by the FDA.

The recall highlights the broader challenges in regulating the supplement industry, which the FDA has limited authority over. Unlike pharmaceuticals, dietary supplements do not require pre-market approval, placing the burden on manufacturers to ensure safety and label accuracy.

In recent months, the FDA has also been dealing with other supplement-related issues, including a chocolate recall due to undeclared allergens, underscoring the persistent problems with labeling compliance.

Consumers are advised to consult their healthcare provider if they have taken the recalled product and experience any adverse effects. The FDA encourages reporting of any adverse events to its MedWatch program.

For those seeking weight loss solutions, experts recommend evidence-based approaches and caution against unregulated supplements, especially those making exaggerated claims. The agency's latest action serves as a reminder of the potential dangers lurking in the supplement aisle.