For laboratory and research use only. Not for human consumption.
FreePen Starter Kit+ free shipping over $200
Limitless Peptides
Cart
Home / Energy & Mitochondrial / Vitamin B12
VITAMIN B1210 mg RUO

Vitamin B12

Energy, focus and healthy nerves, the methylation vitamin you can't make.

  • The energy and nerve vitamin, injectable form bypasses the gut bottleneck entirely
  • Runs the methylation cycle and red-cell production as an essential cofactor
  • Especially relevant on metformin or long-term acid blockers, which deplete it
Studied for
EnergyNerve functionMethylation
≥99% purity HPLC-tested Energy & Mitochondrial
Size
$45per vial

Free shipping over $200 · ships from the USA

Why researchers choose it

B12 is the one vitamin plants don't make, and the body needs it to run methylation and energy metabolism, keep nerves healthy, and build red blood cells. The guide points to vegans, people on metformin, and anyone over 60 as the ones who use it most. And it's easy to confirm it's working, on ordinary blood tests.

Reconstitution reference concentration only, not dosing

Set the vial strength and how much bacteriostatic water you draw into it. This returns the resulting concentration for lab handling. It is a dilution reference, not a dosing recommendation.

—mg / mL
Each 0.01 mL — one unit on a U-100 syringe — holds —
Syringe drawVolumeAmount in that volume

Most compounds reconstitute with bacteriostatic water; a few acid-loving peptides use acetic acid instead. How much to draw, and how many vials a cycle needs, live in the Complete Peptide Guide, not here.

How much, and how many vials for a full cycle?

Protocol and cycle-length questions get answered in the Complete Peptide Guide, not here. These listings carry no dosing.

Read more →
This compound is supplied for laboratory research use only and is not for human or veterinary consumption. The research summarized here describes published third-party findings, not outcomes from Limitless Peptides, and is not dosing guidance or medical advice. These statements have not been evaluated by the Food and Drug Administration; this product is not intended to diagnose, treat, cure, or prevent any disease.

How to verify what you received

Every batch we list is third-party HPLC-tested to ≥99% purity. When your vial arrives, these are the handling and quality-control checks a researcher runs before use.

Commonly studied alongside

NAD+1000 mg RUO

NAD+(1000 mg)

Restores the cell-energy coenzyme that halves between age 20 and 50.

$89
GLUTATHIONE1500 mg RUO

Glutathione(1500 mg)

The master antioxidant for detox, immunity and clearer skin.

$59

More in Energy & Mitochondrial

View all →
MOTS-C40 mg RUO

MOTS-c(40 mg)

Exercise in a vial, the mitochondrial peptide that flips your workout's AMPK switch.

$139
NAD+1000 mg RUO

NAD+(1000 mg)

Restores the cell-energy coenzyme that halves between age 20 and 50.

$89
SS-3150 mg RUO

SS-31(50 mg)

Recharges tired mitochondria, the first mito-targeted drug the FDA approved.

$169

What the research reports 5 citations

  • Cofactor for methionine synthase, the enzyme that runs the methylation cycle.Peptide Guide (PubMed)
  • Cofactor for methylmalonyl-CoA mutase, tying it directly to energy metabolism, nerve function, and red blood cell formation.Peptide Guide (PubMed)
  • Chronic metformin use depletes B12, which is why the guide calls for annual B12 and MMA checks in that group.Peptide Guide (PubMed)
  • Long-term PPI and H2-blocker use cuts B12 absorption in the gut, a bottleneck the injectable form bypasses entirely.Peptide Guide (PubMed)
  • Response is objectively trackable: reticulocytes climb by day 3 to 10 once repletion starts, confirming macrocytic anemia is resolving.Peptide Guide (PubMed)

Compound reference physicochemical facts

Class
Cobalamin (small molecule)
Molecular formula
C63H91CoN13O14P
Molecular weight
1344.4 g/mol
CAS number
13422-55-4
Storage
Lyophilized −20 °C; reconstituted 2–8 °C, kept from light
Source
PubChem CID 10898559
Vitamin B12$45