GMP
Good Manufacturing Practice - the system of facility, process, and testing controls the FDA requires.
GMP (Good Manufacturing Practice) is the system of documented controls - facilities, equipment, personnel, processes, and testing - that ensures a product is consistently produced to its quality specifications. For supplements, the rules live in 21 CFR 111.
A "GMP-certified" manufacturer has passed a third-party audit, but certification isn't a guarantee every batch is perfect - and it doesn't transfer your own brand-owner obligations. Amazon and major retailers typically require a current GMP certificate alongside your COA.
Related terms
Guides that cover GMP
How Much Does Supplement Testing Actually Cost?
Amazon & MarketplaceAmazon Supplement Compliance: Don't Get Delisted
FDA & GMPThe "Oh Crap, The FDA Is Calling" Guide to 21 CFR 111 Testing Requirements
Getting StartedHow to Find a Supplement Testing Lab — The Complete Guide
Test MethodsHeavy Metal Testing for Supplements: Methods, Costs, and What You're Actually Testing For
ManufacturingContract Manufacturer Testing: Why 'They Handle It' Is the Most Dangerous Phrase in Supplements
SpecializedSports Nutrition Banned Substance Testing: NSF, Informed Sport, and BSCG Explained
Getting StartedSupplement Testing for New Brands: What to Do First (Before You Waste Money)
ComplianceImporting Supplements: The Testing and Customs Documentation You Need to Clear the FDA
ManufacturingPrivate Label Supplement Testing: Why Your Manufacturer's COA Isn't Enough
ComplianceCalifornia vs. Federal Supplement Testing: Why FDA Compliance Isn't Enough
Selling OnlineAmazon Supplement Reinstatement: How to Get Your Listing Back After a Compliance Removal
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 ResourcesState of Supplement Testing 2026 — Real Data From Thousands of Quotes
Free ResourcesFree Supplement Specification & COA Templates
Selling OnlineAmazon Supplement Approved Lab List — What Labs Amazon Actually Accepts
Selling OnlineHow to Upload a COA to Amazon Seller Central — Step by Step
Ingredient TestingB-Complex Supplement Testing: Simultaneous B-Vitamin Potency HPLC Panel
Test MethodsBotanical Identity Testing — HPTLC, Microscopy, DNA Barcoding
Ingredient TestingCreatine Supplement Testing: Purity, Impurities by HPLC, and Creapure Verification
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?
Getting StartedHow to Prepare Supplement Samples for Lab Testing — Shipping, Packaging, Chain of Custody
Getting StartedISO 17025 for Supplement Testing, Explained
Getting StartedISO 17025 vs Non-Accredited Labs: Why It Matters for Supplement Testing
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?
ComplianceOrganic Supplement Certification — Testing Requirements
Test MethodsPAH Testing Supplements: Polycyclic Aromatic Hydrocarbons by GC-MS
Ingredient TestingPre-Workout Supplement Testing: Banned Stimulants and Label Accuracy
Ingredient TestingPsyllium Fiber Testing: Identity, Microbial Screening for Salmonella, and Water Activity
Test MethodsResidual Solvent Testing for Supplements — USP <467>
Ingredient TestingSea Moss Testing: Iodine Content, Heavy Metals, Species Auth
ComplianceSkip Lot Testing for Supplements — When You Can Reduce Testing
ComplianceStructure/Function Claims Testing Requirements
Getting StartedThird-Party Supplement Testing: Why It's Non-Negotiable
Ingredient TestingTurmeric Curcumin Testing: Potency, Lead Chromate, Identity
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