Determination of Toxic Elements in Botanical Dietary Supplement Ingredient Reference Materials.

Our assessment

This study examined the presence of toxic elements — arsenic, cadmium, lead, and mercury — in botanical dietary supplement reference materials. Researchers analyzed over 40 Standard Reference Materials (SRMs) and reference materials (RMs) produced by the National Institute of Standards and Technology (NIST). The study's focus was on whether these materials, which represent common botanical ingredients used in supplements, contained measurable levels of these heavy metals. The study was published in 2024. What this means for you: This is a quality-control study on the materials used to test supplements, not a clinical trial on people. It helps ensure that the testing standards for supplements are accurate, but it does not provide direct information on how these elements affect human health [2024 study].

How it works

The research team measured the concentration of four toxic elements — arsenic, cadmium, lead, and mercury — in NIST's botanical supplement reference materials. These reference materials are used by laboratories to verify the accuracy of their own testing methods for dietary supplements. The study was a laboratory analysis, not a human study, so there were no participants or duration of treatment. What this means for you: The study confirms that NIST has developed materials with assigned values for these toxic elements. This is important because it gives supplement manufacturers and testing labs a reliable benchmark to check whether their products contain harmful levels of heavy metals. However, this study does not tell you how much of these metals are in the supplements you buy [2024 study].

Safety profile

Data not available. This study did not report on side effects or adverse events in humans, as it was a laboratory analysis of reference materials. No FDA adverse event report data was provided for this specific study. What this means for you: Because this was not a human study, no information about safety or side effects for consumers can be drawn from this research alone. The presence of toxic elements in botanical ingredients is a potential safety concern, but this study only confirms that NIST has created materials to help measure those elements accurately [2024 study].

Our recommendation

Data not available. This study does not provide any data on dosage, effectiveness, or health outcomes for humans. It is a technical analysis of laboratory reference materials. What this means for you: You cannot use this study to make decisions about taking or avoiding any specific botanical supplement. To understand your personal risk from heavy metals in supplements, look for products that have been third-party tested for purity. If you have concerns about heavy metal exposure, consult your healthcare provider [2024 study].