Foundational · price comparison
Where to Buy Vitamin B12: Cheapest Vendor in 2026
Vitamin B12 pricing across every research peptide vendor we track, ranked by price per mg. Prices change often, so check the vendor before you buy.
No in-stock Vitamin B12 listings right now.
Vendor stock changes often, so check back. Use the compound profile to track research progress in the meantime.
Research profile
Mechanism, dosing, half-life, peer-reviewed studies for Vitamin B12.
Coupon codes
Every active vendor coupon for Vitamin B12, click-to-copy.
Reconstitution calculator
Vial size + BAC water → concentration, syringe units, doses per vial.
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What is Vitamin B12?
Vitamin B12 (cobalamin) is a water-soluble cobalt-containing vitamin that serves as a coenzyme for two critical enzymes in human metabolism: methionine synthase (cytoplasmic) and L-methylmalonyl-CoA mutase (mitochondrial). It is the largest and most structurally complex vitamin, built around a corrin ring that coordinates a central cobalt atom, with different upper-axial ligands defining the four… Read the full Vitamin B12 research profile
Buying Vitamin B12: FAQ
Where can I buy Vitamin B12 online?
Vitamin B12 is currently between in-stock listings across the vendors we track. Bookmark this page and check back, since vendor stock changes often.
What's the cheapest price for Vitamin B12?
No vendor we track lists it as in stock, so there is no price to compare. Check back when listings come back in stock.
Is buying Vitamin B12 online safe?
Vendor safety varies. BodyHackGuide scores every vendor on a 0-100 Trust Score (COA verification, payment transparency, community feedback, shipping practices). This page ranks listings by price per mg, not by score, so check each vendor's score breakdown on its BodyHackGuide profile before you buy.
Do I need a prescription for Vitamin B12?
Vitamin B12 is sold for research-use-only by the vendors on this page; no prescription required for research purchases. None of these vendors sell Vitamin B12 for human consumption, and BodyHackGuide doesn't promote off-label use. Always consult a licensed practitioner before any compound enters a clinical context.
Affiliate disclosure. BodyHackGuide earns a commission on some of its links, at no additional cost to you. Vendor rankings are based on price per mg from the listings we track. We don't accept payment for editorial placement. See our full affiliate disclosure .
Free 2026 Peptide Cheat Sheet (PDF)
38 compounds and blends: vial sizes, BAC water volumes, dosing ranges and bloodwork markers.