What goes wrong

A bigger bottle crossed the line

Updated October 2026

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How it happens Why it is missed The same logic reaches a sample pack And the concentration test still has to be checked This is a family of rules, not one Smaller is a legitimate lever Keep a table, one row per count It is the same shape as three other rules References

Nothing about the capsule changed. There are more of them in the bottle.

How it happens

A product launches in a 30-count, sells, and a 90 or 180-count is added for value. The iron threshold is 250 mg or more in a single package, so the larger size can be over the line while the original was under it.

Why it is missed

A new count reads as a packaging decision. Nobody reopens the compliance file for a bottle size, and there is no step in a normal product process that forces it.

The same logic reaches a sample pack

At an 18 mg dose, fourteen capsules is 252 mg and already over. So a promotional trial size can be inside the requirement while looking like the least regulated thing you sell.

And the concentration test still has to be checked

Both tests must be met, so a very low concentration product can carry a large package total and stay outside. Stopping at the mass test in either direction gets the answer wrong.

This is a family of rules, not one

Iron-containing drugs and acetaminophen use the same mass-per-package shape, and the nail glue remover paragraph does too at 500 mg of acetonitrile per container. Recognizing the shape is the transferable part.

Smaller is a legitimate lever

Where a mass-per-package threshold is the problem, the fill count is a control. That is worth weighing against child-resistant packaging rather than assuming the packaging is the only route.

Keep a table, one row per count

Per-unit elemental iron, count, package total, concentration, and the answer. Adding a row is the step that catches this, and it takes a minute.

It is the same shape as three other rules

Iron-containing drugs, acetaminophen and acetonitrile glue removers are all mass-per-package triggers. Once you have seen one, the habit of asking whether a threshold is per package or per cent transfers to all of them.

References

16 CFR 1700.14(a)(13), Dietary supplements containing iron, requiring special packaging where a supplement contains the equivalent of 250 mg or more of elemental iron from any source in a single package at 0.025 percent or more weight-to-volume for liquids or 0.05 percent or more weight-to-weight for nonliquids, excepting iron present solely as a colorant and powdered preparations at no more than 0.12 percent weight-to-weight. law.cornell.edu

16 CFR 1700.14(a)(12) and (a)(16), the neighboring paragraphs: iron-containing drugs at 250 mg or more of elemental iron in a single package, and acetaminophen at more than one gram in a single package. Both are mass-per-package triggers like the supplement one. law.cornell.edu

Written from federal regulation and from measured catalog data, not from a packaging line. Whether a product crosses the iron threshold is a calculation about your formula and your fill count, and the figures here are the test rather than the answer. Nothing on these pages certifies a package as child-resistant; 16 CFR 1700.15 tests the assembly, not the cap.