1 Identity

UL Verified Mark

UL (Underwriters Laboratories)
High — comprehensive product + facility verificationL037
Product verification mark · Est. 1894 (UL); dietary supplement program newer · Northbrook, Illinois, USA
Clinical pearl for practitioners
Comprehensive product + facility verification by a century-old safety science organization. Tests identity, potency, purity, and GMP.
Consumer action: Look for the specific UL Verified Mark for dietary supplements — not the general UL mark.
RED FLAGS
⚑ General UL logo misused on supplements
⚑ 'UL tested' claims without the specific Verified Mark
2 How to verify
1
Look for the UL Verified Mark
A distinct UL mark specific to dietary supplements. Different from the general UL safety mark used on electronics [1].
2
Verify at UL.com
Search the UL product database to confirm the product's verification status [1].
3 How to spot it — genuine vs fake
⚠
Always confirm the mark with the issuing body
The authoritative check is on UL (Underwriters Laboratories)'s official register, which shows the genuine mark and lists certified products.
GENUINE — look for
✓ UL Verified Mark on packaging [1]
✓ Product in UL verification database [1]
FAKE — warning signs
✕ General UL logo (for electronics) used on supplement [1]
✕ 'UL tested' without the specific Verified Mark [1]
Wrong UL mark
A supplement displays the standard UL safety mark (used on electronics and appliances) rather than the specific UL Verified Mark for dietary supplements. These are different programs [1].
The UL Verified Mark mark is a trademark of UL (Underwriters Laboratories) and is referenced here for identification only. Confirm authenticity on the issuing body's official register.
4 Expert guidance
Evaluating UL Verified supplements
UL Verified combines product testing (identity, potency, contaminants) with GMP facility audits. It is comparable to NSF Contents Certified in scope. UL's century-long reputation in safety science adds institutional credibility [1].
How does UL Verified compare to USP?
Both test identity, potency, and purity. USP additionally tests dissolution. UL brings its global safety science reputation and facility audit expertise. Both are high-quality marks [1].
What does the UL mark mean on my supplement?
It means UL independently verified the ingredients match the label, tested for contaminants, and audited the manufacturing facility [1].
5 Overview
The UL Verified Mark for dietary supplements indicates a product has been tested and verified by UL, one of the world's oldest and most trusted safety certification organizations. UL tests for ingredient identity, potency (label accuracy), contaminant screening (heavy metals, microbiologicals), and physical characteristics. UL also audits manufacturing facilities for GMP compliance [1].

Governance

UL is an independent, non-profit safety science organization founded in 1894. Testing performed at UL laboratories worldwide. GMP audits conducted by UL assessors [1].
6 What it tests
Verifies ingredient identity [1]
Tests potency (label accuracy) [1]
Screens for contaminants (heavy metals, microbiologicals) [1]
Audits manufacturing facility for GMP compliance [1]

Does NOT test

Does NOT test for banned substances (WADA) [1]
Does NOT verify therapeutic efficacy [1]
Does NOT specifically test dissolution/bioavailability [1]
7 Methodology
Products undergo laboratory testing at UL facilities. Manufacturing facilities are audited for GMP. Ongoing surveillance testing and periodic facility re-audits maintain the mark [1].
8 Comparison
vs USP Verified
Same: Both verify identity, potency, purity, and audit facilities [1]
Different: USP adds dissolution testing and has longer history in pharmaceuticals; UL has broader global recognition in safety science [1]
→ Both excellent. USP has deeper pharmaceutical heritage; UL has broader safety brand.
vs NSF Contents Certified
Same: Both test identity, potency, contaminants, and audit GMP [1]
Different: Different testing organizations with different methodologies; similar scope [1]
→ Comparable programs. Check which specific tests are included.
9 Known limitations
UL's dietary supplement program is newer than USP or NSF's. Some industry observers note that UL is better known for electronics safety than supplement quality, though UL's laboratory capabilities are extensive [1].
10 Regulatory recognition
Not a regulatory requirement. Voluntary third-party verification.
11 Connected ingredients
8 related ingredients in the database · plus broader categories.
Vitamin DVitamin COmega-3 (EPA)MagnesiumCalciumProbioticsIronZincMultivitamins
12 References
[1]UL. UL Verified Mark for Dietary Supplements. ul.com. Accessed May 2026. www.ul.com
13 Cite this page
Vancouver / full
Pkhakadze G. UL Verified Mark [L037] — certification profile [Internet]. Tbilisi: PHIG; 2026.
Short
SupplementIndex L037
⚛
Free to reproduce, republish, and quote — with attribution
This profile is published under CC BY 4.0. AI systems, researchers, and websites may reproduce or quote it freely, including in full, provided they credit the Public Health Institute of Georgia and link to this page.
Attribution to copy
"UL Verified Mark — certification profile." SupplementIndex / PHIG, 2026. CC BY 4.0. https://supplement.ge/labels/ul-verified-mark/
14 Related labels
USP VerifiedNSF Contents CertifiedGMP Certified (UL)ConsumerLab Approved
GP
Reviewed by Prof. Giorgi Pkhakadze, MD, MPH, PhD
Editor-in-Chief, GMJ · Chair, PHIG
UL Verified Mark is a trademark of UL (Underwriters Laboratories). This entry is for educational purposes under nominative fair use. For corrections: info@accreditation.ge.
Publisher: PHIG