Potassium 4-methoxysalicylate is a medicinal whitening ingredient,which has the effect of inhibiting the production of melanin, preventing spots from tanning and removing spots.4MSK not only inhibits the production of melanin,but also regulates the conditions of the rough keratinization process.4 MSAK can restore the number of factors in the damaged area,and make all levels of factors in the process of melanin excretion play a role in illuminating the guiding light of melanin excretion.
Potassium methoxysalicylate as a medicinal whitening ingredient,can regulate the keratinization process,inhibit the formation of melanin,and prevent stains and freckles caused by the sun.Potassium 4 methoxysalicylate has the effect of inhibiting melanin production.
Suggested Adding Ratio:
Whitening anti-wrinkle/moisturizing/spotting/moisturizing cream: 2.5%-3%;
Whitening cleanser: 2.5%-3%;
Whitening essence: 2.5%-3%;
Whitening shower gel: 2.5%-3%;
Whitening sunscreen: 2.5%-3%;
Whitening water: 2.5%-3%.
★What is the appearance and purity of your Potassium Methoxysalicylate?
It appears as white or almost white crystalline powder, with purity ≥ 99%, low impurity and stable batch consistency.
★Is Potassium Methoxysalicylate water-soluble or oil-soluble?
4MSK is excellent water-soluble, easy to add in water-phase formulas, very convenient for lotion, serum and water-based products.
★How does Potassium Methoxysalicylate work on the skin?
Potassium Methoxysalicylate regulates melanin distribution, mildly accelerates cutin metabolism, and reduces pigment precipitation without strong irritation, achieving long-term brightening effect.
★What products is 4MSK suitable for?
Brightening toner, whitening serum, spot-correcting essence, oil-control lotion, acne post-care products, mild exfoliating lotion and daily brightening cream.
★How is 4-MSK different from Salicylic Acid?
Salicylic acid is a strong exfoliant primarily used for acne and oily skin, but it can be irritating. 4-MSK is a salicylic acid derivative with a methoxy group, making it less irritating while adding significant melanin-inhibiting activity. It provides mild exfoliation without the harshness of salicylic acid, making it suitable for sensitive skin and long-term whitening treatments
★How does 4-MSK compare to Kojic Acid or Arbutin?
Kojic acid: Very strong tyrosinase inhibitor but unstable (easily oxidized and discolors).
Arbutin: Stable and mild, but slower whitening effect.
4-MSK: Combines moderate tyrosinase inhibition with mild exfoliation. Its unique advantage is synergy with other whitening agents (e.g., tranexamic acid, niacinamide, vitamin C). It is often used in combination formulas for faster, more comprehensive results.
★Is Potassium Methoxysalicylate stable in cosmetic formulations? What pH range is required?
Yes, Potassium Methoxysalicylate is very stable in water-based formulations compared to kojic acid or vitamin C. It remains stable at pH 5.0–7.0 (optimal 5.5–6.5). Avoid highly acidic conditions (pH <4.0) or alkaline conditions (pH >8.0), as hydrolysis may occur. It is compatible with most preservatives, thickeners, and emollients.
★Is 4-MSK approved for cosmetic use in the EU, USA, and China?
Japan: 4-MSK has been approved as a Quasi-drug active ingredient (whitening) since 2005, widely used in Shiseido products.
China (NMPA): Listed in IECIC 2021 (INCI: Potassium Methoxysalicylate) with a maximum concentration of 3% for leave-on products. It is a permitted whitening agent.
EU: No specific restriction; it can be used as a cosmetic ingredient under general safety requirements (SCCS has no negative opinion). Common use 0.5-3%.
USA: Allowed; not restricted by FDA.
We provide full registration documents including COA, MSDS, TDS, and China compliance declaration.
★Can you provide COA, MSDS, TDS for 4MSK?
Yes, we can provide complete documents including COA, MSDS, TDS, specification sheet to support customs clearance and cosmetic registration.