Certificates, identity and what a buyer will ask
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This category runs on documents to a degree that surprises makers arriving from food, and being able to produce them quickly is a commercial advantage as much as a compliance one.
The document set
For each raw material: a certificate of analysis for the lot, a specification, and your identity result or documented verification.
For each finished batch: the batch record, the blend uniformity evidence, any potency assay, and the reserve sample.
And across everything: the written specifications the rule expects you to hold.
What a certificate of analysis should say
Your lot number, not a generic product specification. The test methods used, because methods differ in what they detect. The results as numbers rather than "conforms". The date. And the attributes you actually care about, which usually means identity, potency, heavy metals and microbial counts.
A certificate that says a material conforms to specification without naming the specification is a statement of opinion.
Identity is separate
21 CFR 111 expects you to establish the identity of incoming components. A supplier certificate is evidence of what the supplier believes; the obligation is yours.
The rule permits verification approaches rather than requiring you to test everything, but it expects a written program explaining what you do and why. Botanicals in particular are substitutable and mislabeled often enough that this is a real risk rather than a paperwork exercise.
Why buyers ask
Because a retailer stocking a supplement carries reputational and legal exposure from what is in it, and because this category has a public history of products not containing what they claimed.
A small brand that can produce the full document set within a day is in a different conversation from one that needs three weeks. The testing is the cost; the file is the asset.