Which popular over‑the‑counter joint supplement brands (glucosamine, chondroitin, MSM) are listed in NSF/USP/ConsumerLab directories today?

1. Which products are shown as USP‑verified?

The materials provided explicitly identify Nature Made’s Glucosamine Chondroitin Complex with MSM (Triple Strength + Vitamin D3) as USP‑verified, and the brand’s product page repeats that USP has tested and verified the ingredients, potency and manufacturing process ^{[1] [2]}. The USP verification program checks ingredient identity and potency and is often highlighted in manufacturer claims, which creates an incentive for brands to publicize that status ^[2].

2. What ConsumerLab coverage exists for mainstream brands?

ConsumerLab has repeatedly tested leading joint supplements and publishes a joint health review that both names specific products and reports failures and passes; the organization’s joint supplement review and related product pages note that several mainstream products were tested and that some passed while others failed ^{[7] [8]}. A historical ConsumerLab summary also lists brands like Kirkland Signature (Costco), Life Extension, Solgar, and Whole Foods as having been included in ConsumerLab’s glucosamine and joint supplement testing programs ^[9], and Good Housekeeping reports Osteo Bi‑Flex as having passed ConsumerLab’s voluntary Quality Certification Program ^[3].

3. What does NSF show for joint‑ingredient products?

NSF maintains searchable listings for certified dietary supplements and for its Certified for Sport® program, and the supplied NSF Certified for Sport® listing specifically references Osteosyn® Chondroitin Sulfate with OptiMSM as being added to a comparison listing ^{[4] [5] [6]}. That indicates NSF’s databases include at least some chondroitin/MSM products, but the snippets provided do not enumerate all consumer retail brands certified by NSF.

4. How complete and current is the evidence in these sources?

The sources establish that USP, NSF and ConsumerLab actively test and certify joint supplements and that several recognizable products appear in their reporting, but they do not supply a single consolidated, current directory of every popular OTC brand containing glucosamine, chondroitin or MSM ^{[5] [6] [7]}. ConsumerLab’s reviews list products tested and note failures and approvals ^{[7] [8]}, and USP/brand pages show Nature Made’s USP verification ^{[1] [2]}, yet a fully comprehensive “today” roster across all three organizations is not provided in the documents supplied.

5. What nuance and caveats matter to readers?

Independent certification reduces uncertainty about potency and contamination, which is why consumer guides repeatedly advise looking for NSF, USP or ConsumerLab marks ^{[3] [10]}. ConsumerLab’s test criteria and acceptance ranges are explicit — for instance, their pass/fail thresholds for glucosamine, chondroitin and MSM are described in their methods — and they have flagged both product failures and contaminant issues in the past ^{[11] [12] [9]}. That said, certification is voluntary and intermittent; absence of a mark in a public list does not prove a product is poor, only that no record appears in the supplied excerpts ^{[5] [6]}.

6. Bottom line — what can be stated with confidence from the supplied reporting?

From the provided sources, it can be confidently reported that Nature Made’s glucosamine‑chondroitin‑MSM product is USP‑verified ^{[1] [2]}, Osteo Bi‑Flex has been cited as passing ConsumerLab’s voluntary Quality Certification Program in consumer reporting ^[3], and Osteosyn® Chondroitin Sulfate with OptiMSM is reflected in an NSF Certified for Sport® entry ^[4]. ConsumerLab’s joint supplement reviews list multiple mainstream brands as tested (including Kirkland, Life Extension, Solgar and Whole Foods in past coverage) and document both passes and failures, but the supplied materials do not permit extraction of an exhaustive, real‑time directory across NSF, USP and ConsumerLab for every popular OTC joint supplement ^{[7] [8] [9]}.