Data Sources

USDA FoodData Central

All nutritional data is sourced from the USDA FoodData Central (FDC), maintained by the U.S. Department of Agriculture Agricultural Research Service.

SR Legacy dataset (release 2018-04)
Standard Reference database — the historical basis for most food composition tables used in nutrition research and dietary analysis software.

Foundation Foods dataset (release 2025-12-18)
Newer dataset with more rigorous analytical protocols, multiple samples per food, and expanded metadata. Takes precedence over SR Legacy when both cover the same food.

Reference Daily Intakes

Recommended Dietary Allowances (RDA) and Adequate Intakes (AI) shown on nutrient pages are sourced from:

• NIH Office of Dietary Supplements — Dietary Supplement Fact Sheets
• USDA Dietary Reference Intakes (DRI) tables

Values reflect adult male (19–50) recommendations unless otherwise noted.