Location: Nutrient Data Laboratory2012 Annual Report
1a. Objectives (from AD-416):
Our long-term objective is to provide reliable estimates for the composition of dietary supplement (DS) products due to their increasing prevalence of use. An analytically based composition database of representative values of nutrients and other ingredients in dietary supplement products consumed by the U.S. population is being developed. This database will improve accuracy in estimating the contribution of dietary supplements to total dietary intakes of nutrients and thus will result in a better evaluation of the nutritional status of Americans. Over the next 5 years we will focus on the following objectives: Objective 1: Determine and monitor the nutrient and other ingredient composition of dietary supplements commonly consumed by Americans. Compile, maintain, and disseminate electronic dietary supplement composition databases utilizing standardized approaches according to specified timelines. Objective 2: Evaluate and update methods for the acquisition, evaluation, compilation and dissemination of dietary supplement composition data utilizing new, robust computerized systems. Objective 3: Investigate the variability of dietary supplement composition data attributable to inherent supplement differences, analytical methodology, and other contributing factors.
1b. Approach (from AD-416):
Objective 1: NDL will develop estimates of the nutrient and other ingredient content of high priority dietary supplement (DS) products and disseminate dietary supplement databases on a bi-annual basis. This research will include the identification of high priority dietary supplement products and ingredients according to prevalence of consumption, public health interest in specific ingredients, and the availability of reliable analytical methods for specific compounds. Studies of dietary supplements composition for various product types including user groups by age and/or gender will be conducted. Samples will be analyzed by qualified laboratories which demonstrate expertise in the analysis of dietary supplement components and matrices. Scientists will review and evaluate laboratory data for accuracy and precision and will apply appropriate statistical techniques to final data for estimation of dietary supplement component amounts. Objective 2: NDL will develop and validate methods for data acquisition (e.g., USDA analytical data, industry data), including statistical sampling, sample handling, laboratory methodology, and data quality evaluation, to ensure representative and accurate dietary supplement ingredient estimates. For analytical studies managed by NDL, statistical sampling plans for the analysis of dietary supplements will continue to be developed based upon market share and ingredient label information. NDL will include available Standard Reference Materials (SRMs) when sending batches of samples to the laboratory for analysis. NIST recommendations for the analysis of ingredients in SRMs, including stability information and extraction and homogenization procedures will be used in the development and evaluation of NDL laboratory protocols for contracted labs. Objective 3: NDL will investigate the variability of dietary supplement composition data attributable to inherent supplement differences, analytical methodology, and other contributing factors. The magnitude of variability attributable to the measurement process will vary for each ingredient or ingredient group (i.e., minerals analyzed by inductively-coupled plasma spectroscopy (ICP)) and can confound the results for variability inherent in a product. In addition, the assessment of individual ingredient variability will be a factor in determining sample sizes for future analytical studies.
3. Progress Report:
NDL is continuing to work with the Office of Dietary Supplements, National Institutes of Health, to maintain and expand the Dietary Supplement Ingredient Database (DSID), which supports public health research. A key goal is to report national estimates of the levels of nutrients and other bioactive components in dietary supplements, based on analytical results. The estimates provided by the DSID complement databases that report only label values and support a more accurate estimation of total nutrient intake from foods and dietary supplements. Data were first published in DSID, Release 1 (www.dsid.usda.nih.gov) in 2009. In 2012, the second release of the DSID was published. In 2012, NDL published the second release of the DSID (DSID-2), with 3 times the content of DSID-1. This release provides estimated levels of 20 vitamin and mineral ingredients derived from analytical results for 64 representative children’s multivitamin/mineral (MVM) supplements. Estimates for ingredients in adult MVMs have been updated. The release also includes DSID codes linked to National Health and Nutrition Examination Survey (NHANES) dietary supplement data and 3 MVM calculators that can be used to apply the regression results to additional ingredient levels for each product category. Studies are underway analyzing ingredients in over-the-counter prenatal MVMs, omega-3 fatty acid supplements and an adult MVM-2 study. Statistical sampling plans were developed for all studies, identifying market channel distributions and representative products. An average of 3 lots per product was purchased nationwide. Supplements were sent to qualified laboratories and analyzed using validated methods. Analytical laboratory data for vitamins and minerals in 71 prenatal MVMs were assessed. NDL identified ingredients in specific products for analytical re-testing and those results are currently being evaluated. Initial statistical analysis of analytical data results identified the need for additional analytical re-tests. The optimum definition of total omega-3 fatty acids for use in the DSID is being considered. Representative samples purchased in 2011 were sent to laboratories for the analysis of vitamins and minerals. Vitamin D, vitamin A, and chromium are the focus of this study because results for these ingredients were not finalized for the first adult MVM study due to analytical methodology concerns. To begin the modular approach for the Dietary Supplement Ingredient System (DSIS), the Access databases for each study were upgraded and optimized with structured form and report functions added. Each database documents the product information, analytical testing information and testing results for a study. NDL scientists reported the DSID-2 release and other DSID research topics in talks at the following meetings: Experimental Biology, National Nutrient Database Conference, Institute of Food Technologists National Meeting and the Covance Food and Dietary Supplement Symposium.
1. Release of Dietary Supplement Ingredient Database 2(DSID-2). In 2012, researchers from the Nutrient Data Laboratory, Agricultural Research Service in Beltsville, MD in collaboration with the Office of Dietary Supplement/National Institues of Health published the second release of the Dietary Supplement Ingredient Database (DSID-2). The DSID reports national estimates of the levels of nutrients and other bioactive components in dietary supplements, based on analytical results. The estimates provided by the DSID complement other databases that report only label values. The DSID-2 provides estimated levels of vitamin and mineral ingredients in adult and children’s multivitamin/minerals (MVMs). The release also includes research summary documents, DSID codes linked to The National Health and Nutrition Examination Survey (NHANES) dietary supplement data and 3 MVM calculators that can be used to apply the regression results to additional ingredient levels for each product category. The availability of the DSID is significant, since it provides to the scientific community and the public analytically based dietary supplement data resulting from federally sponsored research. The results from the DSID can be used to assess intakes of dietary ingredients from supplements and foods for a complete evaluation of the impact of nutrient intake on public health.
Swanson, C.A., Zimmerman, M.B., Skeaff, S., Pearce, E., Dwyer, J.T., Trumbo, P.R., Zehaluk, C., Andrews, K.W., Carriquiry, A., Caldwell, K.L., Egan, S.K., Long, S.E., Bailey, R.L., Sullivan, K.M., Holden, J.M., Betz, J.M., Phinney, K.W., Brooks, S.P., Johnson, C.L., Haggans, C.J. 2012. NIH workshop summary: shaping the development of an iodine research initiative for the U.S. Journal of Nutrition. DOI: 10.3945/jn.111.156448.