Can You Use Niacinamide and Tranexamic Acid Together?

If you have ever stood in front of your bathroom shelf wondering whether two ingredients are going to cancel each other out, this is the post for you. The question of whether you can use niacinamide and tranexamic acid together is one we get asked often, and the honest answer is not just yes — it is that these two ingredients tend to work better together than either one does alone.

Here is the science behind why.

What Does Niacinamide Do for Skin?

Niacinamide is a form of Vitamin B3 and one of the most thoroughly researched actives in modern skincare. At 5%, it visibly reduces the appearance of dark spots, even skin tone, and minimise the look of pores. It also reinforces the skin barrier, supporting your skin’s ability to hold on to moisture and defend itself against everyday environmental stressors.

What makes niacinamide particularly interesting is the mechanism by which it targets pigmentation. Rather than interfering with melanin production itself, it works by disrupting the transfer of melanin from melanocyte cells to the surface of the skin. This is why it is so effective at gradually fading existing marks, even after the underlying trigger has already done its work.

It is also one of the gentler brightening ingredients available, which makes it a dependable choice for sensitive or reactive skin types who cannot tolerate more aggressive actives.

What Does Tranexamic Acid Do?

Tranexamic acid takes a different approach. Originally used in medicine to reduce bleeding, researchers discovered it has a significant effect on hyperpigmentation when applied topically. It works by inhibiting the enzyme that triggers melanin production in the first place, which means it targets the pigmentation process earlier in the chain than niacinamide does.

This makes it particularly effective for melasma, post-inflammatory hyperpigmentation (the marks left behind by blemishes or irritation), and the kind of persistent uneven tone that tends to resist other brightening ingredients. At 3%, it is active enough to produce a visible difference while remaining gentle enough for daily use.

The International Journal of Molecular Sciences has published several useful studies on tranexamic acid

Can You Use Niacinamide and Tranexamic Acid Together?

Yes, and this is the part worth paying attention to. Because niacinamide and tranexamic acid act at different points in the pigmentation process, combining them offers more comprehensive coverage than either ingredient can achieve on its own.

Tranexamic acid reduces how much melanin the skin produces. Niacinamide limits how much of that melanin reaches the skin’s surface. Together, they create a layered approach to fading dark spots and uneven tone that is more complete than most single-ingredient products can deliver.

They are also both gentle enough for daily use, and there are no known interactions between them to worry about. No need to separate them into morning and evening applications, no complicated layering rules. They are genuinely compatible, and the research supports using them together.

What Percentages Do You Need?

The concentrations matter, because the evidence behind these ingredients points to specific percentages where they become reliably effective.

For niacinamide, 5% is the concentration most consistently cited in clinical studies as the threshold for visible brightening and barrier benefits. Lower concentrations can still offer some effect, but 5% is where the research is strongest.

For tranexamic acid, skincare professionals generally consider 3% an effective topical dose for addressing hyperpigmentation. Some formulas use as little as 2%, but 3% produces more consistent results, particularly for stubborn concerns like melasma. If you want to read more about the research, the International Journal of Molecular Sciences has published several useful studies on tranexamic acid in topical skincare.

How to Use Them in Your Skincare Ritual

If you are applying them as separate products, the general guidance is to apply the thinner, more watery formula first and work up to heavier textures. Apply to clean, freshly toned skin, and follow with moisturiser once both have absorbed.

If you find a formula that combines both actives at effective concentrations, the layering question disappears entirely. One product, both ingredients, no guesswork.

Apply morning and evening. Consistency is what drives results with brightening actives. Significant fading of hyperpigmentation typically takes six to twelve weeks of regular use, which is simply a reflection of how the skin renewal cycle works rather than any shortcoming in the ingredients themselves.

One Thing That Cannot Be Skipped: SPF

If you are working on hyperpigmentation, daily sun protection is not optional. UV exposure is one of the primary triggers for melanin overproduction, which means that without SPF, even the best brightening ingredients are fighting an ongoing cause. A broad-spectrum SPF 30 or higher, applied every morning as your final step, is what allows everything else to work.

How We Formulated for This

Lacus Temporis, our Pro Collagen Boosting Serum, contains both niacinamide and tranexamic acid at precisely these percentages: 5% Niacinamide and 3% Tranexamic Acid. We also included Hyaluronic Acid for deep hydration and a Saccharomyces Postbiotic, upcycled from the gin-making process at Toniq distillery, to keep the formula microbiome-friendly and gentle enough for reactive skin.

If you have been wanting to bring both actives into your ritual without managing a stack of products, this is the answer we built for that.