Third-Party Tested Vitamin B12 Supplements
Buy NatureWise Vitamin B12: it is on NSF’s testing list and costs $0.12 a day. 5 of the 8 we checked are on a testing list, including Thorne and three Nature Made products.
By Erin Rose Updated November 3, 2026 How we score
Our recommendation
Buy NatureWise Vitamin B12 1000 mcg
It has the top score of the B12 pills we score (9.0), and at list price it costs less a day than the other two pills on a list.
Buy on Amazon · $6.99- Want USP Verified? Nature Made B12 1000 mcg Fast Dissolve is on USP’s list.
- Want methylcobalamin? Thorne Vitamin B12 is on two NSF lists.
- Want a gummy? Nature Made Zero Sugar B12 Gummies is on USP’s list. See the best B12 gummies.
Which vitamin B12 supplements are third-party tested? (5)
An outside program checked each of these and lists it by name. Tap a badge to see the listing.
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Our pick
NatureWise Vitamin B12 1000 mcg
Cyanocobalamin in one softgel. It has gelatin, so it is not vegan.
$0.12 a day at list price
Buy on Amazon · $6.99 -
Methylcobalamin
Thorne Vitamin B12
NSF Certified for SportNSF/ANSI 173
1,000 mcg of methylcobalamin in one capsule. Also on NSF Certified for Sport, so each certified lot is tested for banned substances.
$0.40 a day at list price
Buy on Amazon · $24.00 -
USP Verified
Nature Made B12 1000 mcg Fast Dissolve
1,000 mcg of cyanocobalamin in a tablet that melts in your mouth. The bottle we link holds 150 tablets.
$0.20 a day at list price
Buy on Amazon · $16.85 -
$0.18 a day at Amazon price
Buy on Amazon · $9.98 -
Nature Made Extra Strength B12 Gummies
3,000 mcg of B12 in 2 gummies, three times the dose of the other tested products here.
$0.35 a day at Amazon price
Buy on Amazon · $10.48
A day = the label’s daily serving. Pill costs use each brand’s list price, checked October 15, 2026. Gummy costs use Amazon’s price over the servings in the bottle. Buy-button prices are Amazon’s, checked November 6, 2026. We count a listing only when it names the same product.
Also on a testing list
These B12 products are on a list too. USP list read October 15, 2026; NSF list snapshot August 25, 2026.
- USP Verified: Kirkland Signature Quick Dissolve B-12 5000 mcg Tablets (sold at Costco)
- USP Verified: Nature's Bounty Vitamin B-12 2500 mcg Quick Dissolve Tablets
- NSF/ANSI 173: 21st Century Prolonged Release B-12 1000 mcg (21st Century HealthCare, Inc.)
- NSF/ANSI 173: up&up™ Timed Release B12 1,000 mcg (Target Corporation)
- NSF/ANSI 173: up&up™ Quick-Dissolve B12 2,500 (Target Corporation)
- NSF/ANSI 173: Organic Vitamin B12 Gummies (Harmony Foods LLC dba SCN Bestco)
- NSF/ANSI 173: Wegmans Adult Gummy Vitamin B12 500mcg (Wegmans Food Markets Inc.)
Not on a testing list (3)
We also checked these 3. We did not find them on a USP or NSF list.
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Nutricost Methyl B12 1000 mcg
Not on a testing list
1,000 mcg of methylcobalamin in a capsule. The Amazon listing says third-party tested; we found no public list that names it.
$0.07 a day at list price
Buy on Amazon · $13.95 -
Jarrow Methyl B-12 1000 mcg
Not on a testing list
1,000 mcg of methylcobalamin in a lemon chewable.
$0.13 a day at list price
Buy on Amazon · $11.92 -
Nature Made B12 1000 mcg Time Release
Not on a testing list
1,000 mcg of cyanocobalamin in a slow-release tablet. USP lists the Fast Dissolve, not this one.
$0.13 a day at list price
Buy on Amazon · $10.65
What does each program check?
| Program | What it tells you |
|---|---|
| NSF Certified for Sport | Checks the label and tests each certified lot for banned substances. It is the program athletes use. |
| USP Verified | Checks that the bottle holds the ingredients on the label in the stated amounts, that contaminants stay under set limits, and that it is made to quality standards. |
| NSF/ANSI 173 | Checks that what the label says is in the bottle, with no hidden ingredients and no unsafe levels of contaminants. It does not screen for banned substances. |
ConsumerLab runs a different kind of check. In the method for its B-vitamin review, it buys products off the shelf and sends them to labs that are not told what they are testing. A single-ingredient B vitamin passes only if it holds 100% to 150% of the amount on the label. A failed product is retested at a second lab. A product can pass there without being on a USP or NSF list.
How to check your own bottle
- Look for the USP Verified mark or the NSF mark on the bottle.
- Search NSF’s list or USP’s list for the exact product name. On NSF, search the maker’s company name if the brand name finds nothing, as with NatureWise (Heartwise Incorporated).
- Match the strength and type. Nature Made has USP-listed and unlisted B12 products side by side, so “Nature Made” alone is not enough.
- Read the Supplement Facts for the mcg of B12 in one serving. Most adults need far less than 1,000 mcg; see the dosage guide.
Comparing on more than testing? See the best vitamin B12 supplement, the best for seniors or methylcobalamin vs cyanocobalamin.
Questions
Is NatureWise vitamin B12 NSF certified?
Yes. NSF’s list has “Naturewise Vitamin B12 1000mcg Softgels” under NSF/ANSI 173. NSF files it under the company name Heartwise Incorporated, so a search for “NatureWise” as the company finds nothing. Search the product name, or “Heartwise”. We read the listing on November 3, 2026.
Is Nature Made vitamin B12 third-party tested?
Some of it. USP lists the Nature Made 1,000 mcg Fast Dissolve tablet and its 1,000 mcg softgels, plus the Zero Sugar and Extra Strength gummies. We did not find the 1,000 mcg Time Release tablet or the regular 1,000 mcg gummies on USP’s list. Read the exact product name.
Which tested vitamin B12 is methylcobalamin?
Of the products we checked, Thorne Vitamin B12. It is on NSF/ANSI 173 and NSF Certified for Sport. The other methylcobalamin pills we checked, Nutricost and Jarrow, are on no public list we searched.
Does “third-party tested” on an Amazon listing mean it is certified?
No. A brand can hire any lab and print the phrase, and it does not say what the lab checked. A listing on USP’s or NSF’s website names the exact product. If a brand only says “tested”, ask for the certificate of analysis for your lot.
How do I pick a dose?
Adults need 2.4 mcg a day, and the usual pill holds 1,000 mcg because only a small share is absorbed. See the B12 dosage guide.
Sources
- NSF International. NSF/ANSI 173 dietary supplement listings, searched by product name: NatureWise (Heartwise Incorporated) and Thorne read November 3, 2026; other rows from the August 25, 2026 snapshot. info.nsf.org
- USP Verified products list, read October 15, 2026. quality-supplements.org
- NSF Certified for Sport, Thorne Vitamin B12 listing. nsfsport.com
- ConsumerLab. How the B vitamins and complexes review was done. consumerlab.com
- NIH Office of Dietary Supplements. Vitamin B12 fact sheet for health professionals. ods.od.nih.gov