Peptide Decoding
Vitamin B12 vial, mock product photograph
Mock-up, not a real vendor product
Price transparency

Vitamin B12_

also sold as B12, B-12, Methylcobalamin, Methylated B12

The vitamin sold in peptide vials, at prices from $20 to $83 for the same thing.

SupplementLongevity and energy20 listings
1.3xbetween the cheap end and the dear end of the Vitamin B12 market, per milligram.
$6.50is the middle of the pack per mg. Half the listings sit above it, half below.
0listings hide the price behind an account. We record them rather than guess.
Vendors
16
and all publish a price
Listings
20
sizes and sellers
Cheapest
$19.99
sticker price
Typical per mg
$5.50–$7.15
10th to 90th
Gap
1.3x
cheap to dear
Last read
Sep 22, 2026
prices move
01

Top three vendors

Each card says which it is. This is not a ranked top three.
The rule: at 10 mg — the size most vendors sell — highest published testing evidence first, then cheapest per milligram. 4 vendors qualify. Same rule for every card.

No partner sells Vitamin B12 at 10 mg, so these are the rule winner and the next two sellers under the same rule, all unpaid.

Vitamin B12 vial, illustrative product renderingOur pick

Simple Peptide

simplepeptide.com

No sufficiently specific public evidence was found for the requested criterion. This means 'not demonstrated publicly,' not proof that the vendor never performs it.

10 mg
Price
$5.50per mg
10 mg vial$55.00
Against the median8% below the median
Testing and purity
Nothing verified publicly
Outside lab tested itUnclear
HPLC for purityUnclear
Mass spec for identityUnclear
Your batch testedUnclear
Lab namedUnclear
Buying
Stockin stock
Site accessAccessible
Catalog165 listings
Last checkedAug 22, 2026
Visit Simple Peptide
Vitamin B12 vial, illustrative product renderingRunner-up

Prime Lab Peptides

primelabpeptides.com

No sufficiently specific public evidence was found for the requested criterion. This means 'not demonstrated publicly,' not proof that the vendor never performs it.

10 mg
Price
$6.50per mg
10 mg vial$65.00$70.00
Against the median8% above the median
Against our pick1.2x the price
Testing and purity
Nothing verified publicly
Outside lab tested itUnclear
HPLC for purityUnclear
Mass spec for identityUnclear
Your batch testedUnclear
Lab namedUnclear
Buying
Stockin stock
Site accessAccessible
Catalog73 listings
Last checkedSep 12, 2026
Visit Prime Lab Peptides
Vitamin B12 vial, illustrative product renderingRunner-up

Iron Peak Peptides

ironpeakpeptides.com
10 mg
Price
$5.50per mg
10 mg vial$55.00
Against the median8% below the median
Against our pick1.0x the price
Testing and purity
Not audited yet
Outside lab tested itUnclear
HPLC for purityUnclear
Mass spec for identityUnclear
Your batch testedUnclear
Lab namedUnclear
Buying
Stocklisted
Site accessUnclear
Catalog67 listings
Last checkedAug 22, 2026
Visit Iron Peak Peptides

Every figure here is reconstructible from the full table below. Links noted "We earn from this link" carry a sponsored tag; a commission never changes a card's position, and a partner that wins the rule stays in first place. Prices exclude shipping and were read on the dates shown.

02

Every offer, cheapest per milligram first

Vials come in different sizes, so price per mg is the only column that compares like with like.
Sort by
All sizes1 mg10 mg

We earn from these links. It never changes a price or a position here.

Blends containing this compound

Grouped by formula, cheapest formula first. Every listing is a blend that contains Vitamin B12, so prices are not comparable with the single-compound table above.

  • B12 (1 MG/ML 10ML)1 listing · from $69.00
  • Sigma Compounds
    B12 (1 MG/ML 10ML)
    $69.00Size not stated by the vendor
    not statedin stockSep 22, 2026View
03

Vendor by vendor

What each site was showing when we read it, and how it prices against the rest.
Vendor$5.50/mg
Simple Peptide
2 listings · read Sep 12, 2026

Does not name a testing lab on this product's page.

Coverage record →
Vendor$5.50/mg
Iron Peak Peptides
1 listing · read Aug 22, 2026

Does not name a testing lab on this product's page.

Coverage record →
Vendor$6.50/mg
Prime Lab Peptides
2 listings · read Sep 12, 2026

Does not name a testing lab on this product's page.

Coverage record →
Vendor$7.15/mg
Prime Sciences
1 listing · read Aug 22, 2026

Does not name a testing lab on this product's page.

FDA warning letter 721805, March 31 2026, issued against the hyphenated domain prime-sciences.com
Coverage record →
Vendor$49.30 listed
AminoVault
1 listing · read Aug 22, 2026

Does not name a testing lab on this product's page.

Coverage record →
Vendor$82.99 listed
Forto Labs
1 listing · read Sep 12, 2026

Does not name a testing lab on this product's page.

Coverage record →
Vendor$37.99 listed
Fusion Peptides
1 listing · read Aug 23, 2026

Does not name a testing lab on this product's page.

Coverage record →
Vendor$60.00 listed
Ignite Peptides
1 listing · read Aug 22, 2026

Does not name a testing lab on this product's page.

Coverage record →
Vendor$55.00 listed
Nextech Labs
2 listings · read Sep 12, 2026

Does not name a testing lab on this product's page.

Coverage record →
Vendor$24.99 listed
OP Peptides
1 listing · read Aug 24, 2026

Does not name a testing lab on this product's page.

Coverage record →
Vendor$59.99 listed
Orbitrex Peptides
1 listing · read Sep 18, 2026

Does not name a testing lab on this product's page.

Coverage record →
Vendor$19.99 listed
Panda Peptides
1 listing · read Sep 18, 2026

Names its testing lab: public COA archive with Janoshik links.

Coverage record →
Vendor$33.40 listed
Peak Lab Peptides
1 listing · read Aug 24, 2026

Names its testing lab: Bioviridian, College Station Texas.

Coverage record →
Vendor$44.00 listed
Penguin Peptides
1 listing · read Aug 23, 2026

Does not name a testing lab on this product's page.

Coverage record →
Vendor$69.00 listed
Sigma Compounds
2 listings · read Sep 22, 2026

Does not name a testing lab on this product's page.

Coverage record →
Vendor$55.00 listed
Xcel Peptides
1 listing · read Sep 22, 2026

Does not name a testing lab on this product's page.

FDA warning letter 694608, December 10 2024
Coverage record →
04

Three things price per mg does not tell you

A cheap milligram is only cheap if the vial holds it.
Fill weight

The label is a claim, not a measurement

Every per mg number here divides the price by the milligrams printed on the vial. Testing labs regularly find vials that weigh less than the label says.

Landed cost

Shipping and card fees are not in these numbers

Shipping is often flat, so it hurts small orders most. Several vendors add a card fee and discount for crypto. Two offers a dollar apart can swap places at checkout.

Vial size

Bigger vials look cheaper and go off just as fast

A bigger vial costs less per mg and expires on the same schedule. Once mixed, most people work to about 28 days in the fridge, so the saving only counts if you finish it.

05

How wide the price gap really is

Same compound, same buyers, very different tickets.
1.3x
Cheap end to dear end

Ignoring the few freak listings at each extreme, the dear end of the Vitamin B12 market costs 1.3 times what the cheap end does, per milligram.

$6.50
Middle of the pack

Half these listings charge more than this per mg and half charge less. It moves with sales, which is why every row carries a date.

16
Vendors carrying it

Enough coverage to show a real range. Anything under three vendors stays off the hub.

A row of Vitamin B12 research vials, mock product photograph
Same peptide, 16 vendorsNothing on the glass tells you which seller will show you a lab report you can open, or what a milligram actually costs. That is what the table above is for.
06

What you are actually buying

Regulatory status changes what a price means.
Vitamin B12 vial, mock product photograph
Regulatory status

Supplement

Oral B12 is a supplement. Injectable cyanocobalamin is an approved prescription product, and a research-labelled vial sold online is not that product.

Full Vitamin B12 record →
What that changes

Nobody stands behind a research vial

There is no pharmacist behind it, no dispensing record, and nobody on the hook for what is inside. The lab report is the whole quality system, which is why it sits next to the price here.

Research use only is a claim the seller has to keep making. A vendor that adds dosing instructions, health claims, or personal-use wording has stepped outside the framework it relies on, and that says something about the seller.

What customs and carriers do varies by state and by shipper. This describes how these products are sold and is not legal advice.

07

Before the vial arrives

What actually shows up, and the vial maths that decides which size is the better buy.
Vitamin B12, mock product photograph
Storage

Frozen dry, refrigerated wet

Freeze-dried powder keeps for a long time in the freezer and for months in the fridge. Once liquid goes in, most people work to about 28 days in the fridge, away from light.

Vitamin B12, mock product photograph
Mixing

Bacteriostatic water and insulin syringes are extra

What arrives is powder in a sealed vial. Water goes down the inside wall rather than onto the powder, and the vial is swirled instead of shaken. Neither the water nor the syringes are in the prices above.

Vitamin B12, mock product photograph
Vial economics

The bigger vial is only cheaper if you finish it

A larger Vitamin B12 vial costs less per mg and expires on the same schedule once mixed. The saving is real only when the vial runs out inside that window.

Nothing on this page tells you what to take. Full walkthroughs live in the guides.

08

How this table is built

What decides the order of the rows, and who gets to be in them.
Ordering

Cheapest per mg first, and nothing else

Rows sort on one number. There is no combined score and no weighting, so no vendor can be pushed up the table by a rating you cannot check.

Inclusion

Doing badly does not get a vendor removed

Vendors that publish nothing stay in the table, marked. Taking them out would make the market look tidier than we found it.

Prices

Every price has a date on it

Prices are read off public catalog pages and saved with the date. If a check runs late the row says so instead of showing an old price as current.

Money

Sorting never reads who pays us

Commissioned links are marked on the row and listed on the disclosure page. They never move a listing up or down the table.

How these prices are collected

Prices on this site are read from vendor websites on the dates shown. A starting tag means the vendor publishes only a from price for that product. A wall means the vendor hides prices behind a login, and we publish that fact rather than hide the gap.

We report prices and never rate or score an offer. There is no value grade, no ranking of vendors by our opinion. A row carries its size, its price, its price per milligram, and any plain fact about the listing worth knowing.

When a vendor's site disappears, its rows stay in the tables as a dated record, drop out of every count, price range and ranking, and lose their links. Ninety days after a vendor's site disappears, its rows leave these tables and remain in our records.

Some vendors pay this site a commission when you buy through our links. Every one of those links is marked, and every vendor with that arrangement is labeled on the vendor page. Commissions never change the prices we show, the order of any table, a vendor's badge, or anything in the audit record. The data is collected the same way for every vendor, paid or not.

We accept no payment for coverage, placement, or ratings. Warning letters come from fda.gov. If a paying vendor earns a bad mark, the mark stays.

How this site makes money

09

Questions about buying vitamin b12

Cost, sizes, and how this table works.
How much does vitamin b12 cost?+

Across 16 vendors it typically runs $5.50 to $7.15 per milligram, with the cheapest sticker price at $19.99. Prices exclude shipping, card fees, and bacteriostatic water.

Why is the same vial so much cheaper at one vendor?+

Vial size, sale cycles, payment method discounts, and how much testing evidence a seller publishes all move the number. A cheap milligram is only cheap if the vial holds what the label claims, which no price column can tell you.

Do you make money if I buy?+

Sorting never reads whether a vendor pays us. Any commissioned link is marked on the row and listed on the disclosure page, and it never changes where a listing lands in the table.

Is vitamin b12 legal to buy?+

Oral B12 is a supplement. Injectable cyanocobalamin is an approved prescription product, and a research-labelled vial sold online is not that product.

How current are these prices?+

Every price is read off a public catalog page and stored with its date; this compound was last read Sep 22, 2026. Nothing is overwritten, so a stale row says so rather than pretending to be current.

10

Other longevity and energy compounds with price data

Same catalog sweep, same read dates.