Is 4-Amino-2-Hydroxytoluene safe for all hair types?

While effective as a hair dye, this ingredient can cause allergic reactions in some individuals, regardless of hair type. A patch test is always recommended before full application.

What are the common side effects of hair dyes containing this ingredient?

Common side effects can include skin irritation, redness, itching, and in some cases, more severe allergic reactions. Eye contact should be avoided.

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4-Amino-2-Hydroxytoluene

This ingredient is an aromatic amine used as a colorant in hair dyes. It is a precursor that reacts with other chemicals to form permanent hair color. It is typically used in combination with other dyes to achieve specific shades.

NoneHair dye ingredientVeganEvidence: High

BenefitNone 0 / 4

RiskHigh 2.5 / 4

Sensitization i3 / 4

Risk of allergic contact dermatitis or immune-based reactions. Fragrance allergens, preservatives, botanicals, and some dyes may score here.

Irritation i2 / 4

Risk of short-term irritation — stinging, burning, dryness, redness, or discomfort. Common for strong actives, acids, retinoids, fragrances, and harsh surfactants.

Systemic exposure i1.5 / 4

Whether it has meaningful potential to be absorbed into the body at levels that may matter biologically. Most cosmetic ingredients score low unless there is known concern or high exposure.

Rated by SpottyLabs' ingredient methodology, independent of brands.

Things to watch

Potential for skin sensitization and allergic reactions
May cause irritation to skin and eyes
Possible systemic exposure through skin absorption

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Products with 4-Amino-2-Hydroxytoluene

BioMagic

Hair Color Cream

3.5/ 58/14/16

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Frequently asked questions

Is 4-Amino-2-Hydroxytoluene safe for all hair types?: While effective as a hair dye, this ingredient can cause allergic reactions in some individuals, regardless of hair type. A patch test is always recommended before full application.
What are the common side effects of hair dyes containing this ingredient?: Common side effects can include skin irritation, redness, itching, and in some cases, more severe allergic reactions. Eye contact should be avoided.