The Raw Material Specification Sheet: What 21 CFR Part 111 Actually Requires (And the 5 Elements Brands Keep Missing)

Every year, FDA warning letters and 483 observations for dietary supplement manufacturers pile up in the same section: §111.70 of 21 CFR Part 111. Component specifications — specifically the absence of them, or their inadequacy — remain one of the most reliably cited deficiencies in GMP inspections. And for botanical ingredient buyers and Midwest supplement brands receiving raw materials from international brokers, the stakes are higher than most realize.

The raw material specification sheet isn’t a formality. It’s the first legal and scientific checkpoint in your entire quality system. Get it wrong — or worse, make it vague enough that it can’t actually fail anything — and every downstream result your analytical testing laboratory produces becomes questionable.

Here’s what §111.70 actually demands, and the five specific elements that consistently show up missing when an FDA investigator arrives.

What §111.70 Actually Requires (The Full Standard, Not the Summary)

Most quality managers know that 21 CFR Part 111 requires written specifications for raw material components. Fewer have read §111.70(b) carefully enough to understand what those specifications must cover.

Under §111.70(b), your written specifications for each component must address: identity, purity, strength, composition, and limits on contamination — with contamination specifically including “any that may adulterate or lead to adulteration of the finished batch.” That’s not a checklist item you satisfy with “meets vendor specifications.”

And then there’s §111.75, where the real teeth are. You must conduct at least one appropriate test or examination to verify the identity of each component that is a dietary ingredient — and that testing must be performed on 100% of incoming lots. Not a representative sample. Not every third shipment. Every lot.

The phrase “appropriate test or examination” has been interpreted by FDA to mean a scientifically validated method capable of differentiating the declared species from likely adulterants. A visual inspection and an organoleptic check doesn’t meet that bar for ashwagandha root powder, where multiple visually identical Withania species exist with meaningfully different alkaloid profiles. A spec sheet that says “identity by organoleptic” is telling your auditor you’re not actually testing identity — you’re hoping for it.

The Five Elements Every Botanical Raw Material Spec Sheet Needs

Building a specification sheet that holds up in an FDA inspection — and that your analytical testing laboratory can actually test against — isn’t complicated, but it requires deliberate choices in five areas.

1. Identity Specification With a Validated Test Method

This is where the most 483 observations originate. The identity specification needs to name the expected species using both the common name and the binomial (Valeriana officinalis L., not just “valerian root”), specify the plant part (root, aerial parts, seed), and reference the test method by its exact designation.

For botanical dietary ingredients, USP <2021> (Botanical Identification) and USP <2022> (Identification by HPTLC) are the two most defensible frameworks. DNA barcoding — specifically multi-locus sequencing using ITS1, ITS2, and rbcL markers — is increasingly accepted and is the method that surfaced the supply chain failures that made the 2015 New York Attorney General study so damaging. That investigation tested 78 store-brand herbal products from five major US retailers; DNA barcoding found that only 21% of tested products contained DNA from the labeled plant species. The rest contained substituted species, fillers like rice flour or wheat, or no detectable plant DNA at all. Most had passed visual inspection and organoleptic checks. Their spec sheets said they were fine.

Your identity specification should state the method (e.g., HPTLC per USP <2022>), the reference standard (USP botanical reference standard for that species, where available), and the acceptance criterion — “chromatographic profile consistent with authenticated reference material at Rf zones X, Y, Z.” That last part, defining what a “pass” actually looks like, is what most spec sheets skip entirely.

2. Elemental Impurity Limits Referenced to USP <232>

USP <232> Elemental Impurities — Limits and USP <233> Elemental Impurities — Procedures became effective for dietary supplements in 2018. Eight years later, a significant share of raw material spec sheets still list heavy metals as “per vendor specification” or leave the limits blank as “TBD.”

For oral-route botanical ingredients, USP <232> establishes Permitted Daily Exposures (PDEs) for four primary elements:

• Arsenic (As): 15 µg/day
• Cadmium (Cd): 5 µg/day
• Lead (Pb): 5 µg/day
• Mercury (Hg): 30 µg/day

Your spec sheet needs to convert these PDEs into material-specific limits in µg/g using the maximum daily dose of that raw material in the finished product. If a serving contains 600 mg of root extract, work backward from the PDE — document that calculation in the specification file. “Meets USP <232>” is not an acceptance criterion. A number is.

ICP-MS is the method of choice for meeting USP <233> procedural requirements. It quantifies down to parts-per-trillion levels, captures the full elemental panel in a single run, and is the only technique that consistently meets USP precision requirements for Class 1 and Class 2A elements. An analytical testing laboratory running ICP-MS under ISO 17025 accreditation will give you a defensible data package tied directly to those limits.

3. Microbial Limits Tied to the Correct USP <62> Category

USP <61> and USP <62> provide the framework for microbial testing. Your spec sheet needs to reference the appropriate acceptance criteria for the raw material’s intended use — and the limits vary meaningfully by preparation type.

For dried botanical powders intended for encapsulation, the working limits are typically: Total Aerobic Microbial Count (TAMC) ≤ 10⁵ CFU/g, Total Yeast and Mold Count (TYMC) ≤ 10³ CFU/g, and absence of Salmonella spp. in 10 g.

But here’s what brands consistently miss: the specified organism absence tests must be stated explicitly — “absence of Salmonella spp. per USP <62>, 10 g test portion” — not as a general chapter reference. An FDA investigator who asks what your acceptance criterion is for E. coli deserves a number and a method citation. “We follow USP” is not an answer.

4. Physical and Chemical Parameters With Actionable Limits

For botanical raw materials, this section needs at minimum: moisture content (usually ≤ 12% or per the applicable USP botanical monograph), particle size distribution for powders (state mesh size or D90 value in µm), and any marker compound specification if the material is standardized.

If you’re sourcing standardized extracts — ashwagandha standardized to ≥ 5% withanolides, for example — the marker compound specification is legally your strength specification under §111.70(b). It must name the compound, name the assay method (HPLC-UV at 254 nm, referencing the USP or in-house method), and give the acceptance range as a number. “Minimum per COA” is not an acceptance criterion.

5. Supplier Documentation Requirements and Re-Testing Triggers

This fifth element is procedural, but it shows up on spec sheets during audits and determines whether your material flow is defensible. Your specification should state what documentation must accompany each incoming lot — COA, country of origin statement, allergen declaration — and define the re-testing triggers: any lot where the supplier’s COA is older than 24 months, any lot from a new supplier or a new harvest region, any lot flagged by incoming visual inspection.

This matters because your spec sheet doesn’t just define pass/fail criteria — it governs when and how you engage your analytical testing laboratory for additional work. If the spec sheet doesn’t define re-testing triggers, your team has no documented basis for the judgment calls they make every week, and an auditor will notice.

Setting Acceptance Criteria That Hold Up Under Scrutiny

The most common gap we see in spec sheet reviews isn’t missing parameters — it’s acceptance criteria with no scientific basis. “Passes identification test” is not a criterion. “Consistent with reference” isn’t one either. Criteria need to be measurable, unambiguous, and tied to a specific method.

When working with an analytical testing laboratory to establish limits for a new botanical ingredient, ask for: a method uncertainty statement (how does variability in the method affect where you should set the pass/fail line?), a reference sample set (what does authenticated material look like across the method’s outputs?), and a documented rationale for the chosen limits.

FDA expects that under §111.75(c), your test methods are scientifically valid for their intended purpose. If your identity method is HPTLC, the acceptance criterion must be based on the chromatographic fingerprint of authenticated reference material — and that comparison needs to be documented in writing, not just performed and discarded.

For Chicago-area and Midwest supplement brands sourcing herbs through import brokers or spot-buying from spot markets, this discipline is especially critical. Supply chains from India, China, and Eastern Europe are long, agricultural batches are highly variable, and the economic incentives for adulteration are real. Spec sheets built on the assumption that suppliers are honest are the ones that create product recall exposure.

Where to Start If Your Current Spec Sheets Are Incomplete

Start with your three highest-volume botanical raw materials. For each, verify three things: that the identity specification names a validated method (HPTLC per USP <2022> or DNA barcoding with named loci), that the heavy metals section shows calculated material-specific limits in µg/g rather than “TBD” or a reference to the chapter alone, and that the microbial section names specific organisms, test portions, and method citations.

Those three gaps — identity method, calculated elemental limits, and specified microbial organisms — cover the majority of §111.70 findings we see in pre-inspection gap assessments.

Building a compliant spec sheet takes a few hours per material when done correctly. Defending an inadequate one during an FDA inspection takes considerably longer.

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Written by Nour Abochama, VP Operations, Qalitex | Quality Consultant, Ayah Labs. Learn more about our team

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Related from our network

• ISO 17025-Accredited Analytical Testing for Supplement Raw Materials — Qalitex Laboratories provides the full testing stack (ICP-MS, HPTLC, DNA barcoding, USP microbiology) behind every Ayah Labs CoA issued in the Midwest.