Thiamidol

INCI: Isobutylamido Thiazolyl Resorcinol

Selective human tyrosinase inhibitor by Beiersdorf. Per the manufacturer data, 100 times more potent than kojic acid on the human enzyme.

Brightening

Evidence by route

Topical application

Limited evidence. One RCT or several controlled studies with limitations.

Clinical studies from Beiersdorf and independent groups show reduction in melasma and post-inflammatory hyperpigmentation over 12 weeks. Independent data remain limited.

Tolerability and safety

Irritation potential

Low

Allergen risk

Low

Pregnancy

Caution

Skin types

Suitable for

NormalOilyCombinationDrySensitive

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Frequently asked questions

Is Thiamidol safe during pregnancy?

Thiamidol should be used with caution during pregnancy. Consulting a dermatologist or OB-GYN is advisable.

What skin types is Thiamidol for?

Thiamidol suits: normal, oily, combination, dry, sensitive.

What is Thiamidol and what does it do in cosmetics?

Selective human tyrosinase inhibitor by Beiersdorf.

What's the INCI name for Thiamidol?

The INCI name is Isobutylamido Thiazolyl Resorcinol. It may also appear as: Thiamidol.

Published: April 14, 2026 · updated: May 18, 2026