Methylene Blue — Allergy Risk & Safety Profile

Name: Is Methylene Blue Safe? Allergy Risk & Alternatives
Creator: SkinDetekt

INCI: METHYLENE BLUE

✅ Low Risk

Key Facts

CAS Number: 61-73-4
Category: antioxidant
Risk Level: low
Common Allergen: No
Found In: anti-aging serum

Is Methylene Blue safe in cosmetics?

Methylene Blue is rated low risk in cosmetic products. It is not classified as a common allergen and is generally well-tolerated by most skin types. Commonly found in anti-aging serum.

What is Methylene Blue?

Emerging anti-aging antioxidant. Research suggests it may rival retinol for anti-aging effects.

Allergy & Safety Information

Methylene Blue is considered safe for cosmetic use.

This ingredient is considered low risk from an allergenicity perspective. Reactions are uncommon at typical cosmetic use concentrations. However, no ingredient is universally safe — if you notice redness, itching, or irritation after using a product containing this ingredient, discontinue use and monitor whether symptoms resolve.

About Antioxidant Ingredients

Antioxidants neutralise free radicals generated by UV radiation, pollution, and metabolic processes, preventing oxidative damage to skin cells and the product formula itself. Common cosmetic antioxidants include tocopherol (vitamin E), ascorbic acid (vitamin C), BHT, and plant-derived polyphenols.

Relevance for Methylene Blue: Most antioxidants are well-tolerated, but some — particularly propyl gallate, BHA (butylhydroxyanisole), and certain plant-derived polyphenols — are recognised contact allergens. Vitamin E (tocopherol) allergy, while uncommon, is occasionally identified in patch testing.

How to Identify Methylene Blue in Products

Cosmetic ingredients are listed by their INCI (International Nomenclature of Cosmetic Ingredients) name in descending order of concentration. To check whether a product contains Methylene Blue, scan the ingredient list for its INCI name exactly as it appears above. Ingredients present at 1% or less may appear in any order after the 1% threshold.

Product types to prioritise checking: Anti-aging serum. These product categories are the most common sources of Methylene Blue exposure based on formulation data.

Not sure if your products contain Methylene Blue? Paste the ingredient list into the free ingredient checker to scan for Methylene Blue and other allergens automatically.