CR Packaging for Supplements: When Iron Content Triggers 16 CFR 1700.14(a)(13)

Supplements are not CR-exempt across the board

Most dietary supplements have no federal child-resistant packaging requirement. Iron is the specific, well-defined exception, iron poisoning in young children is a genuine acute toxicity risk, and the Consumer Product Safety Commission built a specific trigger into the Poison Prevention Packaging Act rules to address it.

The exact trigger: 250 milligrams of elemental iron

Under 16 CFR 1700.14(a)(13), any dietary supplement package containing the equivalent of 250 milligrams or more of elemental iron, from any source, at a concentration of 0.025 percent or more by weight for liquids or 0.05 percent or more by weight for solid forms (tablets, capsules, powders, gels), has to be packaged in child-resistant packaging meeting 16 CFR 1700.15(a) through (c). This is a package-level threshold, not a per-serving one: a bottle of 60-count iron tablets at a moderate per-tablet dose can cross 250 milligrams cumulative even if no single tablet looks dangerous on its own.

The exceptions that trip people up

Two carve-outs matter in practice: preparations where iron is present solely as a colorant are exempt, and powdered preparations containing no more than 0.12 percent elemental iron by weight are exempt regardless of total package quantity. Both exceptions are narrow and fact-specific, don't assume a powder or a low-dose formula is automatically exempt without actually running the math against your formulation.

What this means for packaging design

If your formula includes iron, calculate total elemental iron per package early, ideally before committing to bottle count and closure, because retrofitting CR closures onto packaging designed without them usually means a new tooling cycle for the cap. A single-ingredient iron supplement or a multivitamin with a meaningful iron dose are the categories most likely to cross this threshold without the brand realizing it until a compliance review catches it.

How we handle it

We flag iron content against the 1700.14(a)(13) threshold during the packaging spec stage, not after production, and can quote CR closures compatible with standard supplement bottle neck finishes. This article summarizes CPSC's iron CR rule and is not legal advice; confirm current requirements against 16 CFR 1700.14 or regulatory counsel before finalizing packaging. For the general CR testing standard, see What Child-Resistant Packaging Actually Requires.

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