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Calcium supplements: an additional source of lead contamination.
Sohaila Rehman1, Mohammad Adnan, Nasir Khalid
1Pakistan Institute of Nuclear Science and Technology, Nilore, Islamabad, Pakistan. sohaila@pinstech.org.pk
Biological Trace Element Research
|October 19, 2010
Summary
Heavy metal lead contamination in calcium supplements is a significant concern. Most supplements exceed safe lead intake levels, posing risks to consumers.
Area of Science:
- Environmental Health
- Analytical Chemistry
- Nutritional Science
Background:
- Heavy metal lead contamination in calcium (Ca) supplements is a serious health concern.
- Lead contamination occurs because calcium and lead share similar charge densities, leading to inevitable co-occurrence.
- Regulatory limits for lead exist, but consumer awareness regarding its presence in supplements is lacking.
Purpose of the Study:
- To analyze lead (Pb) content in commonly used calcium supplements.
- To calculate the daily lead intake from these supplements.
- To raise consumer awareness about potential lead exposure from calcium supplements.
Main Methods:
- Analysis of 27 calcium supplements using atomic absorption spectrometry (FAAS and GFAAS modes).
- Calculation of daily lead intake based on supplement composition and usage.
- Validation of analytical methods using IAEA-certified reference material (animal bone, H-5).
Main Results:
- Only 10% of analyzed calcium supplements met the US FDA acceptable daily lead intake criteria (1.5 μg/daily dose).
- Chelated calcium supplements showed the highest lead intake, while vitamin D formulations had the lowest.
- Lead concentration significantly increased (p < 0.001) with supplement composition.
Conclusions:
- The majority of calcium supplements analyzed contain unacceptable levels of lead.
- Consumers are at risk of exceeding safe lead intake limits through supplementation.
- Further research and stricter quality control are needed to minimize lead contamination in calcium supplements.
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