Lipo-C & B Vitamins: Ingredients, Formula and Research Guide

NuRev’s LipoC & B-Vitamins formula, per mL and per 10 mL vial. These are NuRev’s stated amounts for this product; formulas sold under similar names by other suppliers differ.

The vitamin forms shown (dexpanthenol, pyridoxine hydrochloride and cyanocobalamin) are the forms stated for this formula. Confirm them, and the choline salt form (for example choline chloride), against the batch Certificate of Analysis before calculating molar concentrations, since the form changes the molar mass.

See the LipoC & B-Vitamins product page for current availability and batch documentation.

“MIC”, “MIC+B12” and “Lipo-C” are informal names for related research blends. None is a standardized formula, so what each contains depends on the supplier. In general terms:

Because the names overlap and aren’t standardized, two products with the same name can have different components and concentrations. For research, compare products by their stated composition and batch Certificate of Analysis, not by name.

“Lipo-C” is a trade-style name that suppliers use for blends built around L-carnitine (the “C”) together with methionine, inositol and choline. It is not a chemical name, and the blends sold under it vary from supplier to supplier. It is also not a peptide: every component is a small molecule, an amino acid, an amino acid derivative or a vitamin.

Because the name doesn’t define a formula, the only reliable description of a vial is its stated composition and its batch Certificate of Analysis.

L-Carnitine (C₇H₁₅NO₃, 161.20 g/mol) is the largest component, at 200 mg/mL. Its role in the cell is to carry acyl groups across the inner mitochondrial membrane, which acyl-CoA molecules cannot cross on their own. Three proteins form this shuttle:

• Carnitine palmitoyltransferase 1 (CPT1), on the outer membrane, swaps the CoA of a long-chain acyl-CoA for carnitine, forming an acylcarnitine
• Carnitine–acylcarnitine translocase (CACT) moves the acylcarnitine across the inner membrane
• CPT2, on the matrix side, swaps it back to acyl-CoA and frees carnitine to return

Carnitine also buffers the ratio of acyl-CoA to free CoA in the cell, which links it to the coenzyme A made from vitamin B5. In the laboratory, acylcarnitine profiles measured by LC-MS/MS are a standard readout of mitochondrial acyl-group handling in cell models.

Inositol (C₆H₁₂O₆, 180.16 g/mol), in its common myo-inositol form, is the head group of the phosphatidylinositol family of membrane lipids. Phosphorylated forms such as PIP₂ are cleaved by phospholipase C into inositol 1,4,5-trisphosphate (IP₃), which releases calcium from the endoplasmic reticulum, and diacylglycerol. Inositol phosphates and phosphoinositides are studied as second messengers in receptor signaling and membrane trafficking.

Choline (the C₅H₁₄NO⁺ cation, 104.17 g/mol) has three fates studied in cell biology:

• Phosphatidylcholine, the most abundant membrane phospholipid, made through the CDP-choline (Kennedy) pathway
• Acetylcholine, made by choline acetyltransferase in cholinergic cell models
• Betaine, made by oxidation of choline, which donates a methyl group to homocysteine through betaine–homocysteine methyltransferase (BHMT)

That last route ties choline into the same methyl-group network as methionine, vitamin B6 and vitamin B12, described below.

L-Methionine (C₅H₁₁NO₂S, 149.21 g/mol) is the precursor of S-adenosylmethionine (SAM), the main methyl donor for DNA, RNA, protein and lipid methyltransferases. After donating its methyl group, SAM becomes S-adenosylhomocysteine and then homocysteine. Homocysteine is either remethylated back to methionine (by methionine synthase with vitamin B12, or by BHMT with betaine from choline) or routed through the B6-dependent transsulfuration pathway to cysteine.

SAM also supplies the methyl groups for carnitine’s own biosynthesis from lysine, which connects the two largest amino-acid components of this solution.

• Vitamin B5 is supplied here as dexpanthenol (D-panthenol, C₉H₁₉NO₄, 205.25 g/mol), the alcohol analog of pantothenic acid. In biological systems dexpanthenol is oxidized to pantothenic acid, the building block of coenzyme A, the carrier of acetyl and acyl groups that carnitine exchanges with.
• Vitamin B6, supplied as pyridoxine hydrochloride (C₈H₁₁NO₃·HCl, 205.64 g/mol), is converted to pyridoxal 5′-phosphate (PLP), the cofactor for transaminases, many amino acid decarboxylases, and the two transsulfuration enzymes, cystathionine β-synthase and cystathionine γ-lyase. The transsulfuration pathway leads to cysteine and, from there, to glutathione.
• Vitamin B12, supplied as cyanocobalamin (C₆₃H₈₈CoN₁₄O₁₄P, about 1355.4 g/mol), is a stable cobalamin form. Cells convert it to the active cofactors methylcobalamin and adenosylcobalamin, which serve two enzymes: methionine synthase (methylcobalamin), which remethylates homocysteine using 5-methyltetrahydrofolate, and methylmalonyl-CoA mutase (adenosylcobalamin) in the mitochondria.

For related biochemistry, see the glutathione redox biochemistry overview and the NAD+ coenzyme research overview.

L-Arginine (C₆H₁₄N₄O₂, 174.20 g/mol) is the substrate of the nitric oxide synthases (NOS1, NOS2 and NOS3), which convert it to nitric oxide and citrulline. It is also hydrolyzed by arginase to ornithine and urea, and it is a precursor of creatine and polyamines. In cell models it is used to study NOS activity, often with nitrite/nitrate (Griess) or fluorescent NO probes as readouts.

The components of this solution are not unrelated ingredients. Most of them meet in two connected areas of cell biochemistry:

This overlap is why mixed solutions are characterized component by component. A change in one component’s concentration can change how results are read for the others.

A multi-component solution needs more testing than a single compound: every component should be identified and measured, not just the largest one.

Identity verification

Each component’s identity is typically confirmed by HPLC retention time against reference standards or by LC-MS. Amino acids and L-carnitine absorb weakly in UV, so they are often measured after derivatization or by mass spectrometry. Cobalamins have characteristic UV–visible absorbance, including a peak near 361 nm.

Component concentration

Quantitative methods measure each component against calibration standards and compare the result to the stated amount per mL. A useful certificate reports each measured value next to its label claim and the acceptance range, rather than a single overall figure.

Batch documentation

A complete Certificate of Analysis for a solution like this typically reports:

• Identity and measured concentration of each component, with the method used
• The salt form of each component where relevant (for example choline chloride, pyridoxine hydrochloride, the cobalamin form)
• pH, appearance (color and clarity) and fill volume per vial
• Lot number, test date and testing laboratory, so each result traces to the vial in hand
• Endotoxin results (LAL) where the solution is intended for cell-based work

NuRev publishes batch certificates in its COA library as they become available. Learn how to read one in our guide to the certificate of analysis; the same principles apply to non-peptide materials. See also HPLC testing, purity testing and endotoxin testing.

Several components of this solution are light-sensitive. Cobalamins in particular degrade under light, and B6 forms are also photosensitive. General practice:

• Store the vial sealed and protected from light, at the temperature stated on the batch Certificate of Analysis
• Keep the vial in its carton until use
• Use clean technique when taking aliquots for laboratory work, and record the date the vial was first opened
• Don’t use a solution that has changed color or clarity or shows particles

More general guidance is in storage best practices.

NuRev supplies this solution for laboratory and in-vitro research use only. It is not for human or veterinary use.