High-performance cosmetic solvent for dissolving difficult actives, improving formulation clarity and creating sophisticated active skincare systems.
Dimethyl Isosorbide, commonly known as DMI, is a highly versatile cosmetic-grade solvent and carrier used by formulators to incorporate ingredients that can otherwise be difficult to dissolve or keep evenly distributed within a cosmetic formulation.
But DMI is much more interesting than an ordinary solvent.
It is particularly valuable in active-led skincare formulations, where the challenge is not simply choosing an impressive ingredient — but successfully getting that ingredient into a stable, elegant and usable cosmetic product.
DMI can help formulators work with:
- Poorly soluble cosmetic actives
- Crystalline ingredients
- Oil-soluble actives
- Antioxidants
- Vitamins
- Botanical compounds
- Brightening ingredients
- Retinoid-type formulation systems
- Complex multi-active serums
It can be incorporated into serums, creams, lotions, gels, toners and other advanced cosmetic formulations.
Croda classifies Dimethyl Isosorbide as both a solvent and an active/effect booster and uses it in skincare applications designed to improve the performance and delivery of active ingredients.
What is Dimethyl Isosorbide (DMI) and How is it Used in Cosmetics?
Dimethyl Isosorbide is a clear liquid cosmetic solvent used primarily to improve the solubility and incorporation of difficult cosmetic ingredients.
Its INCI name is simply:
Dimethyl Isosorbide
In formulation, DMI can act as a bridge between an active ingredient and the rest of the product.
Imagine you have selected an exciting cosmetic active.
The problem?
It does not dissolve properly in water.
It does not dissolve sufficiently in your oils.
Or it initially appears dissolved but later begins to crystallise out of the finished formula.
This is where the solvent system becomes important.
DMI can help create an environment in which certain difficult ingredients remain more effectively solubilised and evenly distributed.
In simple terms:
A brilliant active ingredient is only useful if you can formulate with it successfully.
Dimethyl Isosorbide at a Glance
Product: Dimethyl Isosorbide (DMI)
INCI: Dimethyl Isosorbide
CAS Number: 5306-85-4
Appearance: Clear, colourless liquid
Function: Cosmetic solvent / carrier / active delivery aid
JustGlow Recommended Formulation Range: 1–10%
Processing: Suitable for hot or cold-process formulations
Phase: Can be incorporated into the appropriate solvent or aqueous phase depending on formulation design
Suitable For: Serums, creams, lotions, gels, toners, emulsions and specialist active formulations
Formulation Level: Beginner to advanced, depending on the active being solubilised
Your current JustGlow specification uses 1–10% as the practical formulation range.
Why Do Formulators Use Dimethyl Isosorbide?
One of the biggest challenges in advanced cosmetic formulation is solubility.
You can have an ingredient with fascinating research behind it, but if that ingredient:
doesn't dissolve
or
crystallises back out of the finished product
you do not have a successful formula.
DMI gives formulators another tool for solving that problem.
Helps Solubilise Difficult Cosmetic Ingredients
Some cosmetic actives have relatively poor solubility in either water, oils or both.
Rather than simply dispersing the active and hoping it stays suspended, a formulator can investigate whether an appropriate DMI-containing solvent system can achieve genuine dissolution.
This is particularly interesting for formulations containing small quantities of high-value active ingredients.
Helps Create More Uniform Formulas
If an ingredient is properly dissolved rather than sitting in the formula as undissolved particles, it can be distributed more evenly throughout the product.
This can help create:
- More uniform formulations
- Better clarity
- Smoother textures
- More consistent active distribution
- Reduced risk of visible sediment
- Reduced risk of crystallisation where the solvent system is appropriately designed
Your existing JustGlow formulation guidance specifically uses DMI to pre-dissolve difficult powders before incorporating them into the main formula.
Solubility Is Not the Same as Dispersion
This is one of the most important concepts when working with cosmetic actives.
A powder can appear to disappear into a cream or serum simply because the particles are extremely small.
That does not necessarily mean it has dissolved.
Dispersion
Tiny solid particles are distributed throughout the formula.
Dissolution
Individual molecules of the ingredient are incorporated into the solvent system.
That difference matters.
If an active is only dispersed, it may eventually:
- Settle
- Aggregate
- Feel gritty
- Recrystallise
- Become unevenly distributed
DMI is useful because it allows formulators to investigate true solubilisation rather than relying solely on dispersion.
DMI as an Active Delivery Ingredient
DMI is also interesting because cosmetic ingredient manufacturers do not position it merely as an inert solvent.
Croda lists Arlasolve™ DMI under both:
Solvents
and
Active or effect boosters
and describes it as an ingredient used to enhance the performance and delivery of skincare actives.
This makes DMI especially attractive for modern formulations where the vehicle carrying the active ingredient matters almost as much as the active itself.
Think Beyond the Active Ingredient
Suppose two serums contain exactly the same amount of an active ingredient.
Serum A
The active is poorly dissolved and begins crystallising during storage.
Serum B
The active is incorporated into a carefully designed solvent system and remains uniformly distributed.
On paper, both formulas may declare the same percentage of active.
But they are not necessarily equivalent formulation systems.
This is why experienced formulators think about:
active + solvent + vehicle + stability
rather than simply asking:
“What percentage of the active should I add?”
How to Use Dimethyl Isosorbide in Cosmetic Formulations
DMI is relatively easy to incorporate.
The more difficult question is determining how much DMI your particular active and formulation actually require.
Step 1 – Identify the Ingredient You Want to Solubilise
Determine exactly what you are trying to achieve.
Are you trying to dissolve:
- A crystalline cosmetic active?
- An antioxidant?
- A brightening ingredient?
- An oil-soluble vitamin?
- A botanical compound?
- A difficult powder?
Do not automatically add DMI to every formula.
Use it because it is solving a specific formulation problem.
Step 2 – Conduct a Small Solubility Test
Before making an entire batch, carry out a small-scale experiment.
For example:
Active + DMI
Observe whether the active dissolves.
If necessary, investigate a mixed solvent system rather than relying on DMI alone.
Record:
- Percentage of active
- Percentage of DMI
- Temperature
- Mixing time
- Appearance
- Clarity
This can save a considerable amount of raw material during formulation development.
Step 3 – Pre-Dissolve the Active
Where appropriate, add the active ingredient to DMI and mix until dissolved.
Gentle warming may sometimes help, but only where both DMI and the active ingredient tolerate the selected processing temperature.
Do not assume that heating is appropriate for every active.
Step 4 – Add the Premix to Your Main Formula
Once your active has been successfully solubilised, incorporate the DMI-active premix into the appropriate phase of your formulation.
This might be:
- An aqueous serum
- A gel
- An emulsion
- A lotion
- A cream
- A specialist solvent system
Your current JustGlow formulation guidance recommends pre-dissolving difficult ingredients in DMI first, mixing until clear, and then incorporating the premix into the main formulation.
Step 5 – Check the Finished Formula
Do not stop testing simply because the formula looks clear immediately after manufacture.
Monitor:
- Clarity
- Crystal formation
- Precipitation
- Colour
- pH
- Viscosity
- Odour
- Stability at room temperature
- Elevated-temperature stability
- Freeze-thaw stability where appropriate
- Packaging compatibility
An active that remains dissolved today may still crystallise several weeks later.
Formulator's Tip – Dissolving More Active Does Not Automatically Mean Better Skincare
DMI is an excellent formulation tool.
But its purpose should not be to push unnecessarily large quantities of active ingredients into a formula.
Instead, think of DMI as a way to create a better-designed delivery vehicle.
The goal should be:
the right active + the right concentration + the right solvent system + the right finished formulation
—not simply the highest possible active concentration.
Why DMI Can Be Useful in Minimalist Formulas
Sometimes a relatively simple formulation is the most technically interesting.
For example:
Water + humectant + active + DMI + rheology modifier + preservative
can potentially create a very elegant active serum when the ingredient chemistry supports it.
DMI can therefore be particularly useful when developing modern formulations where you want to avoid loading the formula with multiple unnecessary solubilisers and surfactants.
What Can You Make With Dimethyl Isosorbide?
Advanced Brightening Serum
Use DMI as part of the solvent system for difficult brightening ingredients alongside appropriately selected water-soluble actives.
Antioxidant Facial Serum
Create a sophisticated formulation containing difficult-to-solubilise antioxidants without automatically relying on a high-alcohol system.
Vitamin C Formulation
Depending on the Vitamin C derivative selected, DMI can be investigated as part of the solvent and delivery system.
Always formulate according to the specific chemistry of the Vitamin C derivative rather than treating all forms of Vitamin C as interchangeable.
Oil-in-Water Active Emulsion
DMI can be incorporated into creams and gel-creams where the formulation needs to accommodate a difficult active alongside both water and oil phases.
Lightweight Gel Serum
Combine DMI with an appropriate aqueous gel system to create modern, low-viscosity active skincare.
Targeted Uneven-Tone Formula
DMI is particularly interesting in advanced pigmentation formulations where several actives may have very different solubility requirements.
Ingredients You Could Explore With DMI
The suitability of DMI always depends on the specific active, concentration and complete formulation, but it is particularly interesting to investigate with difficult-to-solubilise ingredients.
Potential formulation concepts include:
4-Butylresorcinol
A potent low-use-level brightening active with limited water solubility.
A carefully designed solvent system may be required to maintain it in solution.
Ferulic Acid
Ferulic Acid can be challenging to incorporate into aqueous formulations and often requires thoughtful solvent design.
Salicylic Acid
Another crystalline active whose solubility can strongly influence the design of the finished product.
Oil-Soluble Vitamin C Derivatives
DMI can be investigated as part of more sophisticated solvent/emulsion systems containing ingredients such as Tetrahexyldecyl Ascorbate.
Retinoid Formulation Systems
Croda positions DMI as an active-delivery solvent for specialist skincare formulations, making the ingredient relevant when investigating sophisticated retinoid-type delivery systems.
Always confirm the stability and regulatory requirements of the particular active being used.
DMI vs Propanediol
Both can act as useful cosmetic solvents, but they are not identical.
Propanediol
Commonly used as:
- Humectant
- Solvent
- Sensory modifier
- Preservation-support ingredient
It is particularly useful in the water phase of many everyday skincare formulations.
Dimethyl Isosorbide
Used primarily where enhanced solvency or active-carrier performance is required.
It can therefore be particularly interesting for difficult or high-value active ingredients.
The question is not necessarily:
“Which solvent is better?”
but:
“Which solvent system works for this particular active?”
In some formulas, combining solvents may be more effective than relying on either ingredient alone.
DMI vs Ethanol
Ethanol can be an extremely effective cosmetic solvent but also has a very different sensory and volatility profile.
DMI is a liquid, non-volatile-style formulation solvent that allows formulators to explore active solubilisation without automatically creating an alcohol-dominant product.
This can be particularly useful when developing leave-on facial skincare.
DMI vs Dimethyl Sulfoxide (DMSO)
Despite the similar abbreviation, DMI and DMSO are completely different ingredients.
Dimethyl Isosorbide is used commercially as a cosmetic solvent and active-delivery ingredient.
Do not confuse:
DMI – Dimethyl Isosorbide
with
DMSO – Dimethyl Sulfoxide
They have different chemistry, applications and safety considerations.
Is Dimethyl Isosorbide Suitable for Beginners?
Yes — if you understand why you are using it.
DMI itself is relatively straightforward to incorporate.
The more advanced part is understanding the solubility of the active you are trying to formulate.
We would describe it as:
Beginner-friendly ingredient, intermediate-to-advanced application.
It is particularly useful for formulators who want to start learning:
- Solubility
- Solvent systems
- Active loading
- Crystallisation
- Vehicle design
- Formulation stability
Frequently Asked Questions
What is Dimethyl Isosorbide?
Dimethyl Isosorbide, also known as DMI, is a cosmetic solvent and carrier used to help incorporate difficult active ingredients into skincare and personal-care formulations.
Croda categorises DMI as both a solvent and an active/effect booster.
What is the INCI Name for DMI?
The INCI name is:
DIMETHYL ISOSORBIDE
What is DMI Used for in Skincare?
DMI is primarily used to:
- Solubilise difficult cosmetic ingredients
- Carry active ingredients within a formulation
- Support uniform active distribution
- Help create clear or elegant active systems
- Reduce formulation problems caused by poorly dissolved crystalline ingredients
It is particularly interesting in sophisticated active skincare formulations.
What Percentage of DMI Should I Use?
JustGlow recommends a working formulation range of approximately:
1–10%
The appropriate amount depends primarily on:
- The ingredient being solubilised
- Its concentration
- The other solvents present
- Water content
- Oil content
- Desired texture
- Final product format
Do not automatically use 10%.
Start with the amount required to achieve your formulation objective. Your current JustGlow product specification also uses 1–10% as the recommended range.
Is Dimethyl Isosorbide Water Soluble?
DMI is suitable for use in water-containing cosmetic systems and is commonly incorporated into aqueous and mixed-solvent formulations.
Its broad formulation versatility is one reason it is useful for skincare applications.
Can I Use DMI in a Water-Based Serum?
Yes.
DMI can be incorporated into water-containing serums where it is being used as part of the solvent or active-delivery system.
Can I Use DMI in Creams?
Yes.
DMI can be incorporated into emulsions including:
- Creams
- Lotions
- Gel-creams
- Emulsion serums
The formulation should still be tested for emulsion stability and ingredient compatibility.
Can DMI Be Heated?
DMI can be used in both hot- and cold-process cosmetic formulations.
However, the more important consideration is often whether the active ingredient dissolved in the DMI is heat stable.
Use only as much heat as your complete formulation requires. Your existing JustGlow formulation guidance also describes DMI as suitable for hot and cold processes.
Does DMI Improve Skin Penetration?
DMI is commercially positioned as more than a simple solvent.
Croda classifies it as an active/effect booster and states that Arlasolve™ DMI can enhance the performance and delivery of skincare actives.
The practical effect will depend on the active ingredient and the complete formulation vehicle.
Can I Use DMI With 4-Butylresorcinol?
DMI is worth investigating as part of the solvent system for poorly water-soluble actives such as 4-Butylresorcinol.
However, solubility must be confirmed experimentally at the concentration you intend to use.
Do not assume that adding DMI automatically guarantees long-term stability.
Can I Use DMI With Ferulic Acid?
It can be explored as part of a solvent system for Ferulic Acid.
The complete solvent balance, pH and long-term crystallisation stability should be tested.
Can I Add Powder Directly Into DMI?
Yes, when appropriate for that particular ingredient.
Small-scale solubility testing is one of the best ways to investigate the required ratio.
Add the ingredient gradually and mix thoroughly before incorporating the premix into your final formula.
Does DMI Replace an Emulsifier?
No.
DMI is primarily a solvent and carrier, not a replacement for the emulsification system required to stabilise oil and water.
If your formula contains separate oil and water phases, you may still require an appropriate emulsifier.
Is DMI a Preservative?
No.
Dimethyl Isosorbide should not be relied upon as the preservative system for a water-containing cosmetic formulation.
Use an appropriate broad-spectrum preservation system and validate the finished product where required.
Plant-Derived Formulation Story
Commercial cosmetic DMI can also have an interesting sustainability story.
Croda describes its Arlasolve™ DMI as:
plant derived
and reports 100% natural-origin content according to ISO 16128 for that particular commercial grade.
However, origin and natural-origin calculations can vary between manufacturers and grades.
If natural-origin positioning is important to your finished product, always confirm the documentation for the specific DMI grade you are purchasing rather than assuming that every DMI on the market has identical provenance.
Storage & Handling
Store Dimethyl Isosorbide:
- Tightly sealed
- In a cool, dry place
- Protected from contamination
- Away from unnecessary prolonged exposure to heat
Use clean, dry formulation equipment and close the container promptly after dispensing.
Important Formulation Information
Dimethyl Isosorbide supplied by JustGlow is a cosmetic raw material for formulation purposes.
It is not a finished cosmetic product and should not be treated as a ready-to-use skincare serum.
The suggested usage range refers to its incorporation into a finished cosmetic formulation.
Formulators producing products commercially are responsible for appropriate:
stability testing • preservation assessment • packaging compatibility • cosmetic safety assessment • regulatory compliance
before placing the finished product on the market.
Why Formulate With Dimethyl Isosorbide?
Some of the most interesting cosmetic ingredients are also some of the hardest to formulate with.
That is exactly where DMI becomes interesting.
It allows the formulator to stop asking only:
“What active should I use?”
and begin asking the more important formulation question:
“What environment does this active need in order to work within my formula?”
A brightening serum.
An antioxidant treatment.
A lightweight active gel.
A sophisticated emulsion.
A multi-active uneven-tone formula.
DMI is not necessarily the ingredient your customer notices on the front of the bottle.
But behind the scenes, it can be one of the ingredients that makes an ambitious formulation actually possible.
For cosmetic formulation use only.
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