Potassium Methoxysalicylate 4MSK 99 Percent Powder

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Potassium Methoxysalicylate 4MSK 99% Powder is a concentrated cosmetic active for brightening, tone-evening and keratinization-focused formulas. It is the potassium salt of 4-methoxysalicylic acid and is designed for controlled R&D loading in leave-on serums, lotions and emulsions. Formulators can begin with a paid evaluation quantity, confirm the current specification and scale to commercial supply after compatibility and stability testing.

99% powder for precise active loading.
Supports brighter-looking, more even-looking skin concepts.
Relevant to formulas focused on keratinocyte differentiation and smoother-looking texture.
Water-phase formulation route with active-basis calculation.
Paid trial sizes, technical discussion and bulk quotation.

Product Specifications

Property	Product Information
Product name	Potassium Methoxysalicylate 4MSK
INCI name	Potassium Methoxysalicylate
Chemical description	Potassium 2-hydroxy-4-methoxybenzoate
CAS number	152312-71-5
Molecular formula	C8H7KO4
Molecular weight	206.24 g/mol, calculated from the public identity record
Ingredient type	Brightening and keratinization-support cosmetic active
Commercial form	Powder
Assay	99%
Use category	Cosmetic formulation raw material for external-use finished products

Key Benefits

Helps target excess pigment at the source.

Published work reports lower melanin content in cultured melanocytes and a 3D epidermal model. [R1] This supports 4MSK’s role in helping reduce the look of uneven pigmentation.

Supports smoother, less flaky-looking skin.

The same research reported keratinocyte differentiation markers and a lower cheek desquamation area ratio. [R1] In simple terms, it helps skin renew more evenly, so flaky patches are less noticeable.

Helps improve skin brightness.

A 12-week split-face study compared a 3% 4MSK formula with a placebo and reported higher skin-lightness measures. [R1] With continued use, this may help skin look clearer and more radiant.

Typical Applications

Brightening serums and essences
Tone-evening lotions and gel creams
Daily facial emulsions with discoloration-focused positioning
Night-care products designed around surface renewal and smoother-looking texture

Quick Formulation Guide

Parameter	Practical Development Guidance
Provisional use level	Screen 0.1-3.0% [R1,R7]
Recommended first screen	Start at 1.0% active, then compare levels based on compatibility and regulatory route.
Assay correction	Powder (%) = target active (%) / 0.99. Use 1.010% powder for 1.0% active or 3.030% for 3.0% active.
Phase and addition	Pre-dissolve in reserved purified water. Add by a validated water-phase or cool-down procedure and check for recrystallization.
Temperature strategy	Begin below 60°C. [R7]
pH strategy	Begin around pH 5.5-7.0 and verify final pH.
Electrolyte risk	Check viscosity loss, haze or precipitation in carbomer, acrylate, gum and lamellar systems.
Validation	Run pH, viscosity, assay, centrifuge, freeze-thaw, stability, preservation and packaging checks.

First Prototype Example

For a 100 g prototype targeting 1.0% active 4MSK, weigh 1.010 g of 99% Potassium Methoxysalicylate powder. Reserve 8.00 g of formula water, dissolve the powder with controlled mixing and return the clear solution to the batch below 60°C. Reduce the main-batch water by 8.00 g. Adjust the finished formula to the validated pH target and record appearance, pH and viscosity immediately and during stability.

For an evidence-bridging 3.0% active screen, the equivalent is 3.030 g of 99% powder per 100 g finished product. Treat this as a separate high-load prototype. Confirm local regulatory acceptability, skin-safety assessment, polymer tolerance and crystallization risk before use. The published clinical result belongs to its tested finished formula, not to the raw powder alone.

Recommended Ingredient Pairings

Ingredient	Role in the Concept	Development Check
Niacinamide	Adds barrier, tone and texture positioning to a daily serum.	Align pH; monitor color, odor and long-term assay.
N-Acetyl Glucosamine	Supports a complementary tone and surface-renewal concept.	Confirm pH and preservation in the complete water phase.
Tranexamic Acid	Creates a multi-pathway discoloration-focused brief.	Review market claims and total electrolyte load; validate solubility.
Panthenol	Adds conditioning and comfort support.	Check tack, preservation and polymer viscosity.
Sodium Hyaluronate	Adds hydration and serum slip.	Add after electrolyte screening; compare molecular-weight grades.

How the Evidence Should Be Read

The strongest public study combined laboratory models with a 31-person split-face study. Participants used a 3% 4MSK formula and placebo twice daily for 12 weeks. The result supports an ingredient rationale, not identical performance across every formula or grade. Shiseido sponsored the work. A correction states that the trial was not registered in an ICMJE-approved registry. [R1,R2]

Research and References

[R1] Shirasugi et al. 2025 full text

[R2] Published correction

[R3] Shiseido 4MSK research and Japan approval context

[R4] PubChem Potassium Methoxysalicylate record

[R5] European Commission CosIng information page

[R6] Japan Cosmetic Association 4MSK glossary

[R7] Third-party 99% powder formulation guidance

Frequently Asked Questions

Is 4MSK the same as salicylic acid?

No. They are different chemical identities. Do not assume the potassium salt has the same pH-dependent exfoliation profile, use level or regulatory status as salicylic acid.

What use level should I start with?

A practical first screen is 1.0% active. A broader 0.1-3.0% range appears in supplier guidance, and 3% was used in one published finished-formula study. Confirm the current TDS and the target market before setting a commercial level.

How much 99% powder gives 1% active in 100 g?

Use 1.010 g powder because 1.000 g active divided by 0.99 assay equals 1.010 g powder.

When should I add it?

Pre-dissolve it in reserved purified water and add through a validated water-phase or cool-down process below 60°C as an initial development approach.

Why can viscosity change?

Potassium Methoxysalicylate is ionic. Electrolytes can reduce the viscosity of some carbomer, acrylate, gum and structured-emulsion systems.

Can we claim the powder is clinically proven?

The public study tested a specific 3% finished formula. Use the study as ingredient and formulation context, then substantiate the claims of your own finished product.

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Potassium Methoxysalicylate 4MSK 99 Percent Powder