What's on the label is the measured result — net peptide mass, not gross powder weight, plus RP-HPLC purity, on a lot-numbered COA for every batch.
Net peptide mass and RP-HPLC purity — a lot-numbered COA for every batch.
Net peptide mass + HPLC purity, per lot.
PCAC will review 7 peptides for the 503A bulks list, BPC-157, KPV, TB-500, MOTS-c, Emideltide, Semax, Epitalon. Read our briefing →
PCAC will review 7 peptides for the 503A bulks list. Read →
FDA PCAC reviews 7 peptides in July. Read →
Cyanocobalamin · cobalamin methyl-donor reference
Overview
Vitamin B12 (cobalamin) is a family of cobalt-containing corrinoid molecules essential to one-carbon (methyl-group) metabolism and to red-cell and neurological function. Cyanocobalamin is the synthetic, air-stable form used as the common commercial raw material and reference standard; in the body it is converted to the two coenzyme-active forms, methylcobalamin and adenosylcobalamin. Its deep-red color comes from the central cobalt held in the corrin ring — the same chromophore that makes B12 straightforward to track spectrophotometrically. PeptideXpo supplies cyanocobalamin as a research and compounding reference, including for the B12-containing lipotropic ('MIC'-type) research blends where it is combined with other metabolic cofactors. It is light-sensitive — protect solutions from light and store cold — and cyanocobalamin, methylcobalamin, and hydroxocobalamin are distinct forms with different stability and handling, so specify the form the workflow requires. Supplied in 10 mg fills, not for human or veterinary use.
Who buys this, and why
Buyers for longevity-class peptides span research labs working on telomere, collagen, and circadian-rhythm models, plus cosmetic-formulation OEMs incorporating peptides like GHK-Cu into anti-aging finished products. Copper peptides in particular require attention to chelator-free water and EDTA-free buffers in downstream formulation work, incompatibility there is the most common cause of "the peptide didn't work" support tickets in this class.
Primary buyer fit: academic and contract research laboratories.
Specifications
Documentation available on request
Regulatory note
Supplied as a research / compounding reference; not for human or veterinary use.
Selected literature
Frequently asked questions
They are all vitamin B12 forms differing in the group bound to the central cobalt. Cyanocobalamin (a cyano group) is synthetic, the most stable, and the standard commercial/reference form; the body converts it to the active coenzymes. Methylcobalamin and adenosylcobalamin are the two physiologically active coenzyme forms. Hydroxocobalamin (a hydroxyl group) is a natural form with longer retention. They are not identical in stability or handling, so research and compounding work should specify the intended form rather than treating 'B12' as one material.
B12 is a frequent component of 'MIC'-type lipotropic research formulations (methionine/inositol/choline plus B-vitamins) because of its role in one-carbon and methyl-group metabolism, which intersects the lipid- and energy-metabolism pathways those blends are used to study. PeptideXpo stocks cyanocobalamin both as a standalone reference and as a component for that class of compounded research preparation.
Related peptides
