Methylcobalamin

Pick your strength first. Within each strength the packages are listed cheapest first, priced per 1,000 mcg so different bottles compare fairly. Strengths are never compared against each other.

200 mcg per serving

2 products

Brand	Per 1,000 mcg	Bottle	Verification
BulkSupplements.com 500 capsules · cheapest here D · None located	19.0¢ + delivery	$18.97 buy	D · None located
BulkSupplements.com 240 capsules D · None located	39.5¢ + delivery	$18.97 buy	D · None located

500 mcg per serving

1 product

Brand	Per 1,000 mcg	Bottle	Verification
Nutricost 240 capsules D · None located	13.3¢ + delivery	$15.97 buy	D · None located

720 mcg per serving

1 product

Brand	Per 1,000 mcg	Bottle	Verification
Havasu Nutrition 30 servings D · None located	$1.06 delivered	$17.99 buy	D · None located

1,000 mcg per serving

4 products

Brand	Per 1,000 mcg	Bottle	Verification
Nutricost 240 capsules · cheapest here D · None located	6.65¢ + delivery	$15.97 buy	D · None located
Nutricost 120 capsules D · None located	9.97¢ + delivery	$11.97 buy	D · None located
Thorne 90 capsules A · Certified	37.8¢ delivered	$34.00 buy	A · Certified
Thorne 60 capsules A · Certified	40.0¢ delivered	$24.00 buy	A · Certified

2,000 mcg per serving

3 products

Brand	Per 1,000 mcg	Bottle	Verification
Nutricost 240 capsules · cheapest here D · None located	3.54¢ + delivery	$16.97 buy	D · None located
Nutricost 120 capsules D · None located	5.82¢ + delivery	$13.97 buy	D · None located
Sports Research 120 capsules D · None located	13.5¢ delivered	$24.95 buy	D · None located

3,000 mcg per serving

1 product

Brand	Per 1,000 mcg	Bottle	Verification
MegaFood 90 capsules Second active this price does not pay for: organic beetroot juice powder 200 mg D · None located	9.26¢ + delivery	$24.99 buy	D · None located

5,000 mcg per serving

4 products

Brand	Per 1,000 mcg	Bottle	Verification
Nutricost 240 capsules · cheapest here D · None located	2.16¢ + delivery	$25.97 buy	D · None located
Nutricost 115 servings D · None located	2.95¢ + delivery	$16.97 buy	D · None located
Nutricost 120 capsules D · None located	3.16¢ + delivery	$18.97 buy	D · None located
Sports Research 120 capsules D · None located	6.24¢ delivered	$29.95 buy	D · None located

Common questions

Methylcobalamin vs cyanocobalamin: what is the price difference?

What each form of vitamin B12 costs per 1,000 mcg at the same labeled strength, with what the Supplement Facts panels say. Absorption is not compared.

Which vitamin B12 brands are third-party tested?

Every vitamin B12 we price, grouped by whether a certifier names the exact bottle sold, another size, or nothing we found. Absence is not a verdict.

What is the cheapest vitamin B12?

Every vitamin B12 we track, both forms, priced per 1,000 mcg from its own label and ranked within each labeled strength, with which bottles a certifier names.

Do third-party tested supplements cost more?

The cheapest product we track in each category beside the cheapest one a certifier names at the exact package, where one exists, and the gap per dose.

Is BulkSupplements third party tested?

Every BulkSupplements product we track, by whether a certifier names the exact package sold, only another size, or nothing we found. With listing IDs.

Is Thorne third party tested?

Every Thorne product we price, checked in NSF’s Certified for Sport database: which listing names the exact package sold, with the listing IDs.

Is Core Med Science third party tested?

Every Core Med Science product we price, checked in NSF’s Certified for Sport database: which listing names the exact package sold, and the IDs.

Is Optimum Nutrition third party tested?

Every Optimum Nutrition product we track, checked in the certifier databases: what each listing covers, package by package, with the listing IDs.

Is Momentous third party tested?

Every Momentous product we price, checked in NSF’s Certified for Sport database: where a listing names the exact package, and where it names another size.

Is BPN third party tested?

Every Bare Performance Nutrition product we price, checked in NSF’s Certified for Sport database: which package each listing names, and which it does not.

Which supplements are NSF Certified for Sport?

Every package we price that NSF names in its Certified for Sport database, by category, with the listing IDs and what each listing actually covers.

Do supplement prices actually change?

We re-read every price we can read automatically each day and keep every reading. Which prices have moved since we started, which have not, and by how much.

How many capsules is one serving?

How many pills the label calls one serving, across every capsule, tablet and softgel we price, and what that does to the count on the front of the bottle.

Is BUBS Naturals third party tested?

Every BUBS Naturals product we price, checked in NSF’s Certified for Sport database: which listing names the exact package sold, with the listing IDs.

Is Sports Research third party tested?

Every Sports Research product we track, checked in the certifier databases: which program lists each one, and which no database we searched lists.

Is Nature Made third party tested?

Every Nature Made product we price, checked against USP’s Verified Products directory and its own label: which packages carry both, product by product.

Is Nature Made vitamin B12 USP Verified?

Nature Made vitamin B12, every strength and count we price, checked against USP’s Verified directory and the USP Verified Mark on each label.

Is Thorne vitamin B12 NSF certified?

Thorne Vitamin B12 checked against NSF Certified for Sport bottle by bottle: which counts the listing names, with the listing ID.

Every vitamin b12 question in one place

About these numbers

What “per dose” means here: 1,000mcg vitamin B12

The adult RDA is 2.4 to 2.8 mcg (NIH ODS), and single-ingredient B12 supplements carry doses hundreds of times that, from a few hundred micrograms to several thousand per serving; the sheet notes that such supplements typically carry the highest doses and that no tolerable upper intake level has been set. 1,000 mcg is a strength printed on many single-ingredient labels and a round figure inside the range sold, chosen so products of different strengths can be priced against each other. It is a yardstick for comparing prices, not a recommended intake, and it cannot change which product is cheapest within a strength: it scales every row by the same number. Because strengths differ by tenfold and more, products are compared within labeled strength bands, the way vitamin D3 is, and never across them. Adopted on September 20, 2026, when the category was built, and the strength bands were signed off by Dan the same night.

Compared in micrograms as printed. The form (methylcobalamin, cyanocobalamin) is a spec, never a ranking input.

Source: National Institutes of Health, Office of Dietary Supplements, Vitamin B12: Fact Sheet for Health Professionals · checked Sep 20, 2026

Where the data comes from

Every claim links to its source. Products, prices and certification listings are read from the retailers' own stores and the certifiers' own databases, and each figure links to the record it came from, so you can check any of them.

Where a label does not state servings per container, the figure is derived from net weight and the product page says so.
Amazon and Walmart are not included, so “cheapest” means cheapest among the retailers we track.
Prices go stale. Each one shows when it was last checked, and says so when it is older than the retailer allows us to cache it.
iHerb prices cannot be refreshed automatically. iHerb has not given us access to its price data, so those prices are marked stale until they are re-read. Each retailer offer carries its own check date.

Found something wrong? Tell us. Corrections are the point.

How we make money

No Buy button on this page earns us anything. The only links on the site that can are the Amazon links shown below the price comparison on some product pages, outside the comparison, and each says so beside it.

Commission will play no part in what we list, how it ranks, or which link we send you to. The Buy button points at the lowest price we have recorded even when that retailer pays us nothing.