21 CFR 111
The FDA's Good Manufacturing Practice regulation for dietary supplements - the rulebook for testing and quality.
21 CFR Part 111 is the section of federal regulation that lays out current Good Manufacturing Practice (GMP) requirements for dietary supplements. It governs identity, purity, strength, and composition testing for raw materials, in-process, and finished products.
There's no small-business exemption - it applies whether you're a one-person brand or a 500-employee facility. The most-cited violation is failing to establish written product specifications. Brand owners are responsible even when a contract manufacturer does the production.
Related terms
Guides that cover 21 CFR 111
Amazon Supplement Compliance: Don't Get Delisted
FDA & GMPThe "Oh Crap, The FDA Is Calling" Guide to 21 CFR 111 Testing Requirements
Test MethodsShelf-Life and Stability Testing: How Long Does Your Supplement Actually Last?
ManufacturingContract Manufacturer Testing: Why 'They Handle It' Is the Most Dangerous Phrase in Supplements
Getting StartedSupplement Testing for New Brands: What to Do First (Before You Waste Money)
ManufacturingPrivate Label Supplement Testing: Why Your Manufacturer's COA Isn't Enough
ComplianceCalifornia vs. Federal Supplement Testing: Why FDA Compliance Isn't Enough
SpecializedMushroom Supplement Testing: Is It Actually Mushrooms or Just Grain Powder?
Getting StartedYour Supplement Failed Testing. Now What?
FDA & GMPSupplement Finished Product Testing: The GMP Release Checklist
Compliance5 FDA Supplement Regulations You're Probably Violating Right Now
Getting StartedDo I Actually Need to Test My Supplements? The Honest Answer
Free Resources21 CFR 111 GMP Compliance Checklist — Free PDF Download
Free ResourcesFree Supplement Specification & COA Templates
Test MethodsAllergen & Gluten-Free Testing for Supplements — ELISA Methods
Ingredient TestingAshwagandha Testing: Withanolides, Root Auth, Heavy Metals
Ingredient TestingBerberine Supplement Testing: HPLC Purity, Adulteration, Identity
Test MethodsBotanical Identity Testing — HPTLC, Microscopy, DNA Barcoding
SpecializedCollagen Supplement Testing — Amino Acid Profile Verification
Test MethodsDisintegration & Dissolution Testing for Supplements — USP <2040>
FDA & GMPDSHEA Explained for Supplement Brands
FDA & GMPFDA Warning Letters for Supplements -- Testing Violations
FDA & GMPForm 483 Response Guide for Supplement Companies
Amazon & MarketplaceGMP Certificate for Amazon -- Do You Need One?
SpecializedGreens Powder Testing — Heavy Metals, Pesticides, Nutritional Panel
Getting StartedHow to Prepare Supplement Samples for Lab Testing — Shipping, Packaging, Chain of Custody
Test MethodsHPLC Potency Testing for Supplements — How It Works
Test MethodsICP-MS vs AAS for Supplement Heavy Metal Testing — Which Method?
Ingredient TestingIron Supplement Testing: ICP-MS Potency, Form Verification, Disint
Getting StartedISO 17025 for Supplement Testing, Explained
Getting StartedISO 17025 vs Non-Accredited Labs: Why It Matters for Supplement Testing
Test MethodsMicrobial Limits Testing for Supplements
Ingredient TestingMultivitamin Testing: Multi-Analyte Potency, Label Overage
Test MethodsMycotoxin Testing Supplements: Aflatoxins, Ochratoxin A, Fumonisins
SpecializedNSF Certified for Sport vs Informed Sport — Which Testing Program?
Test MethodsPAH Testing Supplements: Polycyclic Aromatic Hydrocarbons by GC-MS
Ingredient TestingPre-Workout Supplement Testing: Banned Stimulants and Label Accuracy
Ingredient TestingPrenatal Vitamin Testing: Folate Form, Heavy Metal Safety, Potency
Ingredient TestingPsyllium Fiber Testing: Identity, Microbial Screening for Salmonella, and Water Activity
Test MethodsResidual Solvent Testing for Supplements — USP <467>
ComplianceSkip Lot Testing for Supplements — When You Can Reduce Testing
ComplianceStructure/Function Claims Testing Requirements
ComplianceSupplement Facts Panel Testing Requirements
Getting StartedThird-Party Supplement Testing: Why It's Non-Negotiable
Ingredient TestingTurmeric Curcumin Testing: Potency, Lead Chromate, Identity
Test MethodsUSP 2232 Heavy Metals Testing Explained
Ingredient TestingVitamin C Testing: Ascorbic Acid HPLC Potency, Degradation, Stability
Test MethodsWater Activity Testing for Supplements — Why It Matters
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