Dietary supplements — FDA Serving Size (RACC)
The FDA Reference Amount Customarily Consumed (RACC) for Dietary supplements is 0 g, a Miscellaneous category for the General (4+ years) population under 21 CFR 101.12 — the basis for its Nutrition Facts serving size.
A unit weighing 1 g yields a labeled serving size of 1 dietary supplement (1 g) — the closest whole-unit approximation to the 0 g RACC, per 21 CFR 101.9(b)(2)(i)(D).
Stuck on a serving size, a rounding call, or a %DV?
Send us the question. We'll reply within a day with the FDA rule that applies, its citation, and the math worked through for your numbers. You get the regulation and the arithmetic — not legal or regulatory advice.
Authoritative sources: 21 CFR 101.12 — reference amounts (RACC), 21 CFR 101.9(b) — serving-size conversion, and FDA: Serving Size on the Nutrition Facts label.
For informational purposes only; verify against 21 CFR 101.12 / 101.9(b). · US Nutrition Label Rules v10.0.0 · CFR snapshot 2026-02-12