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Metals Content in Herbal Supplements.

Michelle Vieira Barrella1, Otavio Arruda Heringer2, Priscylla Maria Martins Cardoso1

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This study analyzed metal levels in popular herbal weight loss supplements. Manganese, aluminum, and iron were frequently detected, highlighting the need for stricter supplier certification for consumer safety.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Pharmacognosy

Background:

  • Obesity is a global health crisis, driving demand for weight loss solutions.
  • Herbal supplements are widely used for weight management, but their safety is often unverified.
  • Plant extracts used in supplements may contain potentially harmful metal contaminants.

Purpose of the Study:

  • To quantify metal content in various herbal weight loss supplements.
  • To identify specific plant sources and origins associated with higher metal levels.
  • To assess the safety implications of metal contamination in these products.

Main Methods:

  • Purchased multiple brands of herbal weight loss supplements from local markets.
  • Utilized hot acid digestion followed by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) for metal analysis.
  • Implemented rigorous quality assurance and control measures, including calibration curves and recovery tests.

Main Results:

  • Quantified 14 metals, including aluminum, manganese, and iron, in plant extracts.
  • Manganese, aluminum, and iron were the most frequently detected metals.
  • Elevated levels of these metals were found in specific products, such as Camellia sinensis (China), Ilex paraguariensis (Brazil), Cissus quadrangularis, and Citrus aurantium (China).

Conclusions:

  • The presence of significant metal levels in herbal weight loss supplements poses a potential health risk.
  • Ensuring the adequacy of certification for Brazilian suppliers of herbal weight loss products is crucial for consumer safety.
  • Further regulatory oversight is recommended for herbal supplements to guarantee product safety and quality.