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Supplement brands, assessed by third-party testing

Supplements aren't FDA-rated like drugs, so we assess brands on the real quality signal: independent third-party testing and certifications — NSF, NSF Certified for Sport, USP Verified, Informed Sport, and cGMP manufacturing. Every claim below is checked against the certifier’s own database rather than the brand’s marketing, and where nothing could be confirmed we say so. Being listed here is not an endorsement — the certifications are the assessment. Not medical advice.

Thorne

Premium

Practitioner-grade, heavily tested

NSF Certified for Sport (select)cGMP / NSF-registered facility

Pure Encapsulations

Premium

Hypoallergenic, practitioner line

Third-party testedcGMP facility

NOW Foods

Budget

Affordable, heavily lab-tested

UL/NPA GMP certified facilityIn-house + third-party tested

Nordic Naturals

Mid

Omega-3 specialist

Third-party testedPurity/oxidation tested

Life Extension

Mid

Research-driven, batch COAs

Batch Certificate of AnalysisThird-party tested

Garden of Life

Mid

Whole-food & organic

NSF certified (many)USDA Organic

Nature Made

Budget

Mass-market, many USP Verified

USP Verified (many)cGMP

Klean Athlete

Mid

NSF Certified for Sport line

NSF Certified for Sport

Momentous

Premium

Performance, sport-certified

NSF Certified for SportInformed Sport

Ritual

Mid

Traceable, subscription multivitamins

Third-party testedMade traceable

Seed

Premium

Clinically-studied probiotics

Third-party testedClinically-studied strains

Optimum Nutrition

Budget

Sports nutrition & protein

Informed Choice / Sport (select)cGMP

Sports Research

Mid

Clean-label, third-party tested

Third-party testedNon-GMO

Jarrow Formulas

Budget

Science-based formulations

cGMPThird-party tested

Doctor's Best

Budget

Patented, science-based ingredients

cGMPBranded ingredients

MegaFood

Mid

Whole-food, glyphosate-tested

NSF certifiedGlyphosate Residue Free

Solgar

Mid

Established premium brand

cGMPQuality program

Designs for Health

Premium

Practitioner-only line

Third-party testedcGMP

Nature's Bounty

Budget

Mass-market basics

cGMP

Transparent Labs

Mid

Fully-dosed, label-transparent sports

Third-party testedNo proprietary blends

Kirkland Signature

Budget

USP Verified on about two dozen products

USP Verified (about two dozen products, not brand-wide)

Centrum

Budget

NSF-certified on 25 products — but not USP Verified

NSF/ANSI 173 certified (25 products, listed under Haleon US Holdings LLC — not brand-wide)

AG1 (Athletic Greens)

Premium

NSF Certified for Sport, premium price

NSF Certified for Sport (product-level, covers the AG1 powder line and other listed SKUs)NSF/ANSI 173 (AG1 Essentials Gummies)

Vital Proteins

Mid

NSF-certified collagen across three programmes

NSF Certified for Sport (select products, not brand-wide)NSF/ANSI 173 Dietary Supplements

Nutrafol

Premium

NSF Certified for Sport hair supplement

NSF Certified for Sport (hair-growth products and Clear Skin)NSF Contents Certified (company-stated)

Olly

Mid

NSF-certified on many products, not all

NSF/ANSI 173 certified (many products, not brand-wide)

Orgain

Mid

Organic-certified; no purity-testing certification

USDA Organic (QAI)Non-GMO (NSF)

GNC

Mid

Retailer; no third-party certification confirmed

No third-party certification program confirmed

Bulletproof

Mid

No certification; 2020 FDA cGMP warning letter

No third-party certification program confirmed

Onnit

Mid

Facility GMP claim; product certification unconfirmed

No third-party product certification confirmed (company states NSF-certified GMP facilities)

Goli Nutrition

Mid

No third-party certification confirmed

No third-party certification program confirmed

How we assess supplement brands

The FDA does not approve or recall-rate supplements the way it does prescription drugs, so a recall-safety score doesn't apply. Instead we look at the signal that actually separates supplement quality: independent third-party testing and certification. The strongest marks are NSF and NSF Certified for Sport (screens 280+ banned substances), USP Verified, and Informed Sport/Choice; cGMP manufacturing and per-batch Certificates of Analysis add assurance. We surface what each brand is verified for rather than invent a single score. This is general reference, not medical advice — always consult a professional.