Vitamin C vs Tranexamic Acid for Dark Spots in Pakistan

Vitamin C is an antioxidant that is unstable and can oxidise; tranexamic acid and kojic acid are brightening ingredients more commonly used for dark spots and uneven tone. They are not rivals so much as different tools. Whichever you pick, sunscreen every morning matters more than the ingredient, and results take 8 to 12 weeks.

For the research, the products and prices in one place, see our tranexamic acid guide.

Key takeaways

A review of vitamin C in dermatology describes L-ascorbic acid as unstable: it oxidises on light exposure and the product turns yellow, and a low pH helps stability.
That review does not support specific claims about heat or air, so we make none.
Tranexamic acid and kojic acid are used in brightening serums; they are often combined in one product.
Add one ingredient at a time, wear sunscreen daily and judge after 8 to 12 weeks.

How do the three compare?

	Vitamin C (L-ascorbic acid)	Tranexamic acid	Kojic acid
What it is	Antioxidant and brightening ingredient	Brightening ingredient studied for melasma	Brightening ingredient used in soaps, creams and serums
Main use	Dullness, uneven tone, antioxidant support	Dark spots, melasma-type pigmentation, uneven tone	Dark spots and uneven tone
Stability	Unstable; oxidises on light exposure and turns yellow	No known colour change problem; follow storage directions	Generally stable in well-made products; follow storage directions
Irritation	Can sting, especially at low pH or high strength	Usually described as mild; individual reactions differ	Can irritate some skin, especially soaps
Typical timing	Morning	Morning or night	Morning or night
Needs sunscreen	Yes	Yes	Yes

For a dedicated head-to-head of the last two, see kojic acid vs tranexamic acid. For soap, cream and serum forms of kojic acid, see kojic acid forms. For what tranexamic acid serums offer, see tranexamic acid serum benefits and price, and for safe use, how to use tranexamic acid serum safely.

What did the research on vitamin C find?

Telang’s review in the Indian Dermatology Online Journal notes that L-ascorbic acid is unstable, oxidising to dehydroascorbic acid on light exposure and turning yellow, and that a pH below 3.5 helps its stability. It does not give us evidence on heat or on how long a given serum lasts, so we cannot promise a shelf life. In practice that means choosing opaque or dark packaging and keeping the bottle closed.

What about the research on tranexamic acid and kojic acid?

Tranexamic acid has been reviewed for melasma; see the review linked in Sources. A 12-week clinical evaluation of a serum containing 3% tranexamic acid, 1% kojic acid and 5% niacinamide in women with facial dyschromia reported improvement from week 2 to week 12, including in a melanin index. That is one formula in one study, and not the same as any Chelure product, so we do not claim it proves how our serum performs. A dermocosmetic review notes that depigmenting products work best as part of a programme that includes strict sun protection.

How do you check whether a vitamin C serum has oxidised?

Colour	What it usually means	What to do
Clear or very pale	Fresh	Use normally
Pale yellow	Some oxidation may have started	Use with caution; consider replacing soon
Dark amber or brown	Likely well oxidised	Replace it
Strange smell or stinging more than before	Possible degradation or irritation	Stop and patch test a fresh bottle

Which should you choose?

If you want	A reasonable starting point
Dullness and an antioxidant step in the morning	A vitamin C serum in stable packaging; see vitamin C serum guide
Dark spots or melasma-type patches	A tranexamic acid or combined brightening serum; see serum for dark spots
A soap or cream for dark spots on the body	See kojic acid soap, cream or serum
Dark marks after pimples	See pimple marks removal
A gentler first step	One ingredient, patch tested, with sunscreen

Can you combine them?

Many people use vitamin C in the morning and a tranexamic or kojic acid product at night, which keeps them apart. Many serums also contain tranexamic acid, kojic acid and alpha arbutin together; see alpha arbutin vs kojic acid. The Chelure Brightening & Anti-Aging Serum contains 3% tranexamic acid, 3% kojic acid, AHAs and alpha arbutin, so you do not need to add a second brightener. Introduce any new active on its own first.

Frequently asked questions

Is vitamin C better than tranexamic acid for dark spots?

Neither is clearly better for everyone. Vitamin C is an antioxidant that can also brighten; tranexamic acid is more commonly chosen for dark spots and uneven tone.

Can I use vitamin C and tranexamic acid together?

Many people do, in the morning and at night. Introduce them one at a time and patch test.

Why does my vitamin C serum turn yellow?

L-ascorbic acid oxidises on light exposure, which turns the product yellow. Choose dark or opaque packaging and replace dark amber serums.

Is kojic acid or tranexamic acid better?

See our head-to-head. Many serums combine them.

How long do brightening ingredients take?

Judge after 8 to 12 weeks of daily use with sunscreen. Results vary.

Do I need sunscreen with these?

Yes. Reviews stress that sun exposure aggravates hyperpigmentation and strict sun protection is mandatory.

Is oral tranexamic acid the same as a serum?

No. Tablets are a prescription medicine for a doctor to decide; a serum is a cosmetic. See tranexamic acid safe use.

Are these safe in pregnancy?

We have not found pregnancy-specific data, so ask your doctor. See skincare in pregnancy.

Sources

Telang PS. Vitamin C in dermatology. Indian Dermatol Online J, 2013;4(2):143-146. doi:10.4103/2229-5178.110593 (PubMed 23741676)
Desai S, Ayres E, Bak H, et al. Effect of a tranexamic acid, kojic acid, and niacinamide containing serum on facial dyschromia: a clinical evaluation. J Drugs Dermatol, 2019;18(5):454-459 (PubMed 31141852).
Review of tranexamic acid for melasma. PMC. PMC6715124
Guerrero D. Dermocosmetic management of hyperpigmentations. Ann Dermatol Venereol, 2012. doi:10.1016/S0151-9638(12)70130-8 (PubMed 23522633)
Sofen B, Prado G, Emer J. Melasma and post inflammatory hyperpigmentation: management update and expert opinion. Skin Therapy Lett, 2016 (PubMed 27224897).

A gentle reminder

Skincare helps the look and feel of your skin; it does not treat medical conditions. Patch test any new product behind the ear or on the inner arm first, and introduce one new active at a time. If you are pregnant or breastfeeding, or you have a skin condition such as eczema, ask your doctor before adding active ingredients. See our FAQ for more, or build your own routine.