Products · Vitamins & minerals · Thorne
Thorne Vitamin B12 (Methylcobalamin) 1 mg
Reader ratings
A single-ingredient B12 capsule (1,000 mcg as methylcobalamin) listed in NSF’s Certified for Sport database. The dose sits at the low end of the range our guide cites for low B12, and no batch results are public.
Best for People who need B12, such as vegans or metformin users, and want a plain one-ingredient capsule with an outside tester behind the label.
- Our quality rating
- Good (4 of 5)
- Price range
- Mid-range
- Verified marks
- NSF Certified for Sport (capsule, 60 and 90 count)
- Size
- 60 capsules (60 servings at one a day); a 90-capsule bottle is about $34
approx. $24 for 60 capsules
See it on Thorne’s site →We are not affiliated with Thorne. This link goes to the maker’s own page, with no tracking code. How we're funded.
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Your review
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How we evaluated it
Why we chose it What put it on our list
- NSF’s Certified for Sport database lists “Thorne Vitamin B12”: capsule, package sizes 60 and 90, one capsule a serving, with five lots shown (416646, 417270, 417271, 416898 and 416645).
- The label has one active ingredient with an amount: vitamin B12 as methylcobalamin, 1 mg (1,000 mcg). The other ingredients are leucine, microcrystalline cellulose, silicon dioxide and the hypromellose capsule.
- 1,000 mcg is the low end of the 1,000 to 2,000 mcg a day of oral B12 that our B12 guide cites for correcting a confirmed deficiency.
- At $24 for 60 capsules it costs about $0.40 a day, or about $0.38 with the 90-capsule bottle ($34).
Trade-offs What to weigh before you buy
- Thorne says the body uses methylcobalamin more efficiently than other forms. Our guide says that dose matters more than form, so do not pay extra for the form alone.
- NSF lists the 60 and 90 capsule sizes. Thorne’s 90-capsule page names NSF Certified for Sport, but its 60-capsule page (the one we link) says only that the product is third-party tested and certified.
- No batch certificate is public. NSF’s listing shows lot numbers, not results.
- The label allows up to three capsules a day. Our guide suggests testing first (holotranscobalamin or MMA) if you take metformin or are over 50, since serum B12 alone can miss a deficiency.
What to know Details worth knowing first
Our B12 guide says vegans, metformin users and many adults over 50 are at higher risk of low B12, and that high-dose oral B12 corrects it. If you fall into one of those groups, a plain B12 capsule is a simple tool. This one has 1,000 mcg of methylcobalamin and nothing else active.
It is on the list because NSF lists the product and its lots in its Certified for Sport database. NSF tests products against their labels and screens for banned substances, and its database is public. Thorne’s 60-capsule page says only that the product is “third-party tested and certified” without naming the tester (its 90-capsule page does name NSF), so the NSF record is what we rely on.
Two things to keep in mind: the form matters less than the dose, according to our guide, and a blood test is the way to know whether you are low. For which medicines can lower B12, see which medications deplete nutrients.
Quality & testing How it measures up against our checklist
- Third-party tested
- Yes
- Tested by
- NSF (Certified for Sport)
- Certificate of analysis
- No
| What we checked | What we found |
|---|---|
| Third-party tested Verified | Listed in NSF’s Certified for Sport database as “Thorne Vitamin B12”: capsule, package sizes 60 and 90, five lots, gluten-free claim. The listing shows no certification date or status. |
| A certificate of analysis Not verified | None on Thorne’s page. NSF’s listing shows lot numbers but no results. |
| The right form Maker’s claim | Vitamin B12 as methylcobalamin, 1 mg (1,000 mcg) per capsule. |
| A plain label Maker’s claim | One active ingredient with an amount. No proprietary blend. |
| Disclosed extras Maker’s claim | Leucine, microcrystalline cellulose, silicon dioxide, hypromellose (capsule). Thorne lists it as gluten-free, dairy-free and soy-free. |
What the labels mean
- Verified We opened an independent record that confirms it: a certifier’s listing, a regulator’s list or a lab report. It is linked under Sources.
- Maker’s claim The maker says so on its own page or label. We read it but found no independent record.
- Not verified We looked and could not confirm it, or the maker does not say. Treat it as unknown.
Sources Where our facts come from
- Thorne Vitamin B12 (methylcobalamin) product page, 60 capsules. Maker’s page. Price, label and directions as seen 2026-10-22. The 90-capsule bottle is at https://www.thorne.com/products/dp/vitamin-b12-90. Open ↗
- NSF Certified for Sport listing: Thorne Vitamin B12. Certifier or regulator listing. Package sizes 60 and 90; five lots. Open ↗
Alternatives Other options to compare
- Nature Made Vitamin B12 1000 mcg softgels About $17 for 90 on Nature Made’s site, where the page says USP has tested and verified it. We could not open USP’s database, so the listing is unchecked.
- B12 from food or fortified foods Our guide covers who is at risk and how to choose a dose.