Best Vitamin B12 vendors in 2026
Buying Vitamin B12: what the field looks like
We track 9 in-stock Vitamin B12 listings across 7 US retail vendors, and re-read every one of them each night. Ranking below is by cost per milligram, which is the only figure that compares a 5mg vial against a 10mg one honestly.
The cheapest source works out at $1.87/mg against a median of $4.40/mg across the field — 43% less for the same milligram of the same compound. That gap is why this page exists: on Vitamin B12 the vendor you pick matters more than the size you buy.
The lowest total cart is $24.99 at glacieraminos. That is the cheapest way to hold Vitamin B12 at all, which is a different question from the best cost per milligram — the two are the same vendor only sometimes.
Top 5 Vitamin B12 vendors at a glance
| # | Vendor | Size | Cheapest vial | Per mg | vs median | Score | |
|---|---|---|---|---|---|---|---|
| 1 | glacieraminos | 10mg | $24.99 | $2.50 | 43% under | 6.0/10 | View → |
| 2 | s1research | 10mg | $29.99 | $3.00 | 32% under | 8.1/10 | View → |
| 3 | penguinpeptides | 10mg | $44.00 | $4.40 | — | 3.8/10 | View → |
| 4 | peptideplugs | 10mg | $50.00 | $5.00 | — | 5.6/10 | View → |
| 5 | primelabpeptides | 10mg | $65.00 | $6.50 | — | 5.0/10 | View → |
All 7 ranked Vitamin B12 vendors
glacieraminos
10mg$24.99$2.50/mgpack: 10× → $1.87/mg6.0/10Get deal →Prices sit in the 36th percentile of each compound's field — cheaper than 64% of listings. · Cheapest source we track on 4 compounds. · 41 compounds, 169 live listings. · 95% of listings in stock at the last check. · No certificates published that we could find. · Tracked for 2 days.
s1research
10mg$29.99$3.00/mg8.1/10Get deal →Prices sit in the 10th percentile of each compound's field — cheaper than 90% of listings. · Cheapest source we track on 3 compounds. · 18 compounds, 27 live listings. · 96% of listings in stock at the last check. · Certificates published on 100% of listings, newest 2 months old. · Tracked for 2 days.
penguinpeptides
10mg$44.00$4.40/mg3.8/10Get deal →Prices sit in the 78th percentile of each compound's field — cheaper than 22% of listings. · 25 compounds, 41 live listings. · 98% of listings in stock at the last check. · No certificates published that we could find. · Tracked for 2 days.
peptideplugs
10mg$50.00$5.00/mg5.6/10Get deal →Prices sit in the 41th percentile of each compound's field — cheaper than 59% of listings. · Cheapest source we track on 2 compounds. · 36 compounds, 41 live listings. · 91% of listings in stock at the last check. · No certificates published that we could find. · Tracked for 2 days.
primelabpeptides
10mg$65.00$6.50/mg5.0/10Get deal →Prices sit in the 72th percentile of each compound's field — cheaper than 28% of listings. · Cheapest source we track on 1 compound. · 22 compounds, 40 live listings. · 100% of listings in stock at the last check. · Certificates published on 100% of listings. · Tracked for 2 days.
ionpeptide
10mg$75.00$7.50/mg4.5/10Get deal →Prices sit in the 48th percentile of each compound's field — cheaper than 52% of listings. · Cheapest source we track on 1 compound. · 18 compounds, 41 live listings. · 85% of listings in stock at the last check. · No certificates published that we could find. · Tracked for 2 days.
amc-essentials
1mg$84.99$84.99/mg5.4/10Get deal →Prices sit in the 47th percentile of each compound's field — cheaper than 53% of listings. · Cheapest source we track on 3 compounds. · 35 compounds, 37 live listings. · 96% of listings in stock at the last check. · No certificates published that we could find. · Tracked for 2 days.
Bulk and multi-vial pricing
Ranked by cost per milligram. A pack is always a bigger cart than a single vial — the question these answer is whether it is cheaper per milligram, not whether it is cheaper.
| Vendor | Pack | Total | Per mg | |
|---|---|---|---|---|
| glacieraminos | 10×10mg | $187.42 | $1.87 | View → |
Vitamin B12 vial sizes compared
Vendors sell Vitamin B12 in 2 sizes. Cost per milligram is not the same across them, so the biggest vial is not automatically the best value.
| Vial size | Vendors | Cheapest | Best per mg | At |
|---|---|---|---|---|
| 1mg | 1 | $84.99 | $84.99 | amc-essentials |
| 10mg | 6 | $24.99 | $2.50 | glacieraminos |
Blends containing Vitamin B12
Separate products, priced per mg of total peptide across every compound in the vial. Not comparable to the Vitamin B12 prices above.
Vitamin B12 price history
Median cost per milligram across the field, one point per day we crawled.
How we rank these vendors
Vendors are ordered by cost per milligram of their cheapest in-stock single vial. Nothing else moves the order — not commission, not whether a vendor has a partner programme, not how long we have tracked them.
The score beside each vendor is a listing-quality score, not a purity or trust score. We have no laboratory and we do not test anything. It is built from figures we measure ourselves: where the vendor's prices sit inside each compound's own field, how many compounds they carry, how reliably their listings stay in stock, and how many certificates they publish. Every input is shown beside the number.
Prices older than 48 hours are dropped rather than shown stale, so a vendor missing from this page is usually a vendor whose site we could not read last night.
Common questions
Who sells Vitamin B12 cheapest right now?
glacieraminos, at $1.87 per milligram and $24.99 for the cheapest single vial. That is across 7 US retail vendors, checked within the last 24 hours.
How much should Vitamin B12 cost per mg?
The median across 7 vendors is $4.40/mg. Anything at or under that is a fair price; the cheapest we can find is $1.87/mg, and the top of the market runs to $53.99/mg.
Which vial size of Vitamin B12 is the best value?
Vendors sell Vitamin B12 in 2 different vial sizes, and the cost per milligram is not the same across them. The table above prices each size separately so you can see which one is actually cheaper per mg rather than per vial.
Are multi-vial kits cheaper?
1 vendor sell Vitamin B12 in multi-vial packs. They are usually cheaper per milligram and always a larger cart, so they are ranked separately above rather than mixed into the single-vial list.
Can I buy Vitamin B12 in a blend?
Yes — 1 blend recipe we track contain Vitamin B12. A blend is a separate product and its cost per milligram counts every compound in the vial, so it cannot be compared to the Vitamin B12 prices on this page.
Do you sell Vitamin B12?
No. We sell nothing and ship nothing. Every link goes to the vendor's own store, and some of them pay us a commission — those are labelled on the row, and commission never affects the ranking, which sorts on price alone.