Niacinamide vs azelaic acid: check the amount

Reference: Balina and Graupe, 1991

What is the difference between niacinamide and azelaic acid?

Niacinamide and azelaic acid were tested at different strengths. A dark-spot trial used 5% niacinamide, while a melasma trial used 20% azelaic acid.

These were separate studies, so they cannot name a winner. A bottle listing either ingredient still needs its own amount checked.

Reference: Hakozaki et al., 2002

Reference: Balina and Graupe, 1991

A name on the list is the first clue. The next clue is the amount! 🔍

The niacinamide and azelaic acid pages keep the two ingredients separate.

Which one is studied for dark spots?

Niacinamide and azelaic acid have been studied in different groups of people. A trial compared 5% niacinamide moisturizer with its plain base in people with dark spots.

Another compared 20% azelaic acid cream with 4% hydroquinone for melasma. Both groups used sunscreen.

Reference: Balina and Graupe, 1991

Melasma results do not promise the same result for every dark mark.

Reference: Hakozaki et al., 2002

Reference: Balina and Graupe, 1991

Melasma means patches of darker skin. The dark spots page helps keep that question separate from a red mark after a pimple. 🫧

Reference: Hakozaki et al., 2002

Reference: Balina and Graupe, 1991

Reference: Shucheng et al., 2024

Reference: Draelos et al., 2005

Reference: DailyMed, 2020

On October 19, 2026, PERBETE's catalogue had 25,597 skincare products with a linked ingredient list.

Of those, 8,244 listed niacinamide, 84 listed azelaic acid and 38 listed both. 🧮

Those counts show what is listed. They do not show the amount in a bottle.

Which one was tested for red marks after acne?

Azelaic acid was tested at 15% in a trial of red and dark marks after acne.

People used the gel twice daily for 12 weeks, with a gel without azelaic acid as the comparison.

Red-mark measures improved more with azelaic acid. That finding belongs to the tested gel and strength.

Reference: Shucheng et al., 2024

The study started with 72 people; 60 finished. That matters when judging how much a trial can say.

Reference: Shucheng et al., 2024

A red mark and a dent are different questions. This trial does not show that azelaic acid fills dents. The acne scars page covers that wider topic.

What about rosacea?

Azelaic acid 15% gel has a US prescription label for bumps from rosacea.

A separate study tested a niacinamide-containing moisturizer in people with rosacea and found better skin moisture and barrier function.

The abstract does not give the niacinamide amount. That moisturizer study cannot show what niacinamide alone would do.

Reference: DailyMed, 2020

Reference: Draelos et al., 2005

The moisturizer study involved 50 people over four weeks. Its comparison was an untreated forearm, not a plain moisturizer on the other side of the face.

Reference: Draelos et al., 2005

A whole moisturizer has more than one ingredient. The study belongs to the whole mix.

For ongoing redness or bumps, the rosacea page is a starting point for a chat with a skin doctor.

Can you use niacinamide and azelaic acid together?

Some products already list both ingredients. On October 19, 2026, PERBETE counted 38 products with niacinamide and azelaic acid together.

A trial of that pair is not in the studies used for this guide. The count cannot tell whether two separate bottles work well together or suit one person's skin.

Two names in one bottle do not turn the separate studies into a study of the pair. 🧩

For a prescription gel, follow its own directions and ask the prescriber before adding another active.

Reference: DailyMed, 2020

Pregnancy asks a separate question. PERBETE's notes list azelaic acid applied to skin as usable in pregnancy.

Niacinamide stays "not rated yet": the pregnancy review on file does not discuss it. Missing data does not mean harm. Ask a clinician about the whole product.

Reference: Putra et al., 2022

Why does the percent on the label matter so much?

The percent tells how much of an ingredient is in a product. The studies here tested specific strengths, so a name alone cannot show whether a bottle reaches them.

US cosmetic lists go from larger amounts down, but ingredients at 1% or less may be placed in any order after those above 1%.

Reference: Hakozaki et al., 2002

Reference: Balina and Graupe, 1991

Reference: US Food and Drug Administration, 2016

PERBETE's October 19, 2026 count found azelaic acid among the first five ingredients in 33 of the 84 products listing it. It appeared later in the other 51.

A list position cannot reveal the exact percent. 📝 Even a high place cannot confirm a study's strength. The brand may state the amount elsewhere.

The checker shows where each ingredient sits. A missing percent stays unknown.

More label clues are in how to read a skincare ingredient list. Check a bottle with the ingredient checker.

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