Tranexamic Acid

Also known as: TXA

What Is Tranexamic Acid?

Tranexamic acid is a synthetic derivative of the amino acid lysine. It has been used in medicine for decades, and dermatologists became interested in it for pigmentation after noticing its effects on discoloration. In cosmetic skincare, it is used topically in serums, toners and spot treatments, at concentrations different from any medical use.

Its brightening effect is linked to how it interferes with certain signals between skin cells that encourage melanin production, especially signals triggered by UV exposure and inflammation. That makes it a different approach from tyrosinase inhibitors like alpha arbutin, and the two are often combined. It is commonly paired with niacinamide too, giving a multi-step approach to uneven tone.

Topical tranexamic acid is popular for hyperpigmentation, including post-blemish marks and patchy discoloration. Oral tranexamic acid is a prescription medication and should only be used under a doctor's supervision, so ask a dermatologist if you are curious about it.

Tranexamic Acid Benefits for Skin

• Helps reduce the look of stubborn dark spots and patches.
• Helps fade red-brown marks left after breakouts.
• Well tolerated, even on many sensitive skin types.
• Works through a different pathway than most brighteners, so it combines well.
• Easy to layer morning and night.

How to Use Tranexamic Acid

Apply a tranexamic acid serum after toner and before moisturizer, once or twice daily. Pair it with niacinamide for a complementary approach, and expect to wait at least a couple of months for noticeable changes.

Daily sunscreen is non-negotiable when targeting pigment, since UV exposure triggers the very signals tranexamic acid works against. Our guide on how to apply sunscreen covers the amount and reapplication.

Side Effects & Precautions

Topical tranexamic acid is generally gentle, though mild dryness or irritation can occur. Discontinue if your skin becomes red or itchy. If you have melasma or pigment that does not respond to skincare, a dermatologist can help determine the right treatment plan. Melasma can be stubborn and is easier to manage with professional guidance, as covered in our page on sun damage.

Pigment that fades with tranexamic acid can return if sun protection lapses or if the original trigger, such as heat or hormonal shifts, continues. Many people keep a brightening serum in their routine long term for that reason. Tranexamic acid is also included in some cleansers, but leave-on serums give it more time on the skin.