"A practical supplier guide to Dimethyl Sulfoxide (DMSO, CAS 67-68-5, C2H6OS, MW 78.13): a transparent, colourless, hygroscopic liquid with a melting point of 18.4 C, boiling point of 189 C, and density 1.100 g/mL at 20 C. Covers why it is called the 'universal solvent' (dissolves 50-60% of its own weight), how it works as a skin-penetration carrier next to cosmetic actives, its role as a pharmaceutical and peptide-synthesis solvent, and the industrial extraction and handling points buyers need to know."
-Deshangchemical-chemechemi
Walk into almost any synthetic chemistry lab and you will find one bottle that gets reached for more than most: dimethyl sulfoxide. Chemists know it as DMSO, and its registry number is CAS 67-68-5. It is a small sulfur-containing molecule with the formula C2H6OS (often written (CH3)2SO) and a molecular weight of 78.13. At room temperature it is a transparent, colourless, essentially odourless liquid that is hygroscopic and flammable. Its melting point sits at 18.4 °C, so in a warm room it is always liquid; its boiling point is 189 °C (lit.), and its density is about 1.100 g/mL at 20 °C.
Those numbers only tell part of the story. What makes DMSO worth a dedicated product page is how it behaves, not just what it is. Below we cover where it fits in a formulation pipeline, how buyers actually use it, and the handling points that matter when you move it by the drum.
Why formulators call it the "universal solvent"
DMSO is a polar, aprotic liquid with a high boiling point and good thermal stability. It mixes with water freely and dissolves most organic substances, including ethanol, propanol, ether, benzene and chloroform. It does not mix with alkanes, which is exactly why it is useful for separating them. More to the point, it can hold a surprising amount of solute: roughly 50–60% of its own weight, against the 10–20% typical of many common organic solvents. That load-bearing capacity is why it shows up in sample management, reaction media, and high-throughput screening work.
In practice we see DMSO specified as an analytical reagent, a stationary liquid for gas chromatography, and a solvent for UV-spectroscopy work. It is also a reaction medium for aromatic hydrocarbon extraction, for resin and dye processing, and for the polymerization and spinning of acrylic and acetate fibres. When a process needs a solvent that stays liquid at temperature, carries a heavy solute load, and does not react with everything in the flask, DMSO is a default candidate.
As a skin-penetration carrier in topical and cosmetic work
One property separates DMSO from a ordinary solvent: it passes through skin. It has strong penetrating power, which is why it has long been studied as a carrier that helps other actives reach deeper layers. That makes it relevant wherever a formulator is building a topical system and needs a co-solvent or delivery aid alongside the active itself.
For teams working on brightening systems, DMSO is a natural co-solvent next to water-soluble actives such as Kojic acid (CAS 501-30-4) and Alpha-Arbutin (CAS 84380-01-8). In antioxidant serums it helps solubilize L-Ascorbic Acid (CAS 50-81-7), the reference form of Vitamin C. For anti-aging and repair concepts it pairs with peptide raw materials such as GHK-Cu copper peptide (CAS 49557-75-7), and with emollient carriers like Squalane (CAS 111-01-3) that improve the feel of the finished formula.
It also complements exfoliating and clarifying actives. DMSO is a useful medium alongside Glycolic acid (CAS 79-14-1), Salicylic acid (CAS 69-72-7), and humectants such as Urea (CAS 57-13-6), which is itself used for its keratolytic and moisture-binding properties. Where a formula needs preservation, a multifunctional booster like Ethylhexylglycerin (CAS 70445-33-9) is often built into the same system. The point is not that DMSO replaces these actives — it is that it helps move them, dissolve them, and keep them stable in the bottle.
In pharmaceutical and peptide work
DMSO's anti-inflammatory and analgesic character, plus its carrying power, put it on the shortlist for topical pharmaceutical preparations. In peptide and amino-acid research it is a routine solvent for dissolving difficult intermediates before coupling. That is where it sits comfortably next to protecting reagents such as Di-tert-butyl dicarbonate / Boc anhydride (CAS 24424-99-5), and next to bulk amino-acid raw materials like Creatine monohydrate (CAS 6020-87-7), where it is also used as a cryoprotectant in cell-culture and downstream supplement manufacturing.
For organic synthesis more broadly, DMSO is a reliable medium for reactions that need a polar aprotic environment. It is the kind of workhorse that sits beside aromatic ketone building blocks such as 4'-Methylpropiophenone (CAS 5337-93-9), where a high-boiling, stable solvent keeps the reaction clean.
In industrial and extraction processes
Outside the lab, DMSO earns its keep in several process roles. It is used as a dyeing solvent and carrier for synthetic fibres, as an absorbent for recovering acetylene and sulfur dioxide, as a modifier for synthetic fibres, and as an antifreeze and dielectric fluid in capacitors and brake systems. Its selective extraction capacity makes it a candidate for separating alkanes from aromatics and for recovering rare metals. In metalworking and corrosion-sensitive systems it is sometimes specified alongside corrosion inhibitors such as benzotriazole (CAS 95-14-7).
Handling, storage, and what to watch
DMSO is hygroscopic, so it pulls moisture from the air and should be kept sealed. Store it away from oxidizers and watch for the one reaction buyers are told about early: under certain conditions DMSO can react violently with acyl chlorides, so the two are never blended directly. On contact with skin it is readily absorbed — which is the property that makes it useful as a carrier, but also the reason it can carry dissolved contaminants through the skin. Good practice is to avoid skin contact, wash thoroughly with water if exposed, and keep a dilute ammonia solution on hand for spills.
The most commonly reported side effects from exposure are skin irritation and a garlic, onion, or oyster odour on the breath and skin. Facilities handling it at scale treat ventilation and evaporation control as standard procedure rather than an afterthought.
Buying DMSO in bulk
For most buyers the question is consistency, not novelty. Every batch should be tested before it ships, the grade should match the application (technical, pharmaceutical, or analytical), and the documentation — COA, MSDS, packing list, and certificate of origin — should travel with the order. Packaging can usually be adjusted to the buyer's requirement, whether that is a small research quantity or a full export drum.
If your process needs a high-boiling, polar aprotic solvent with real carrying power, DMSO is hard to beat on the spec sheet. Tell us the grade and volume you need, and we will quote against tested stock with the paperwork your market expects.
