# What niacinamide studies tell formulators

> The familiar 5% study, oil measurements, and barrier research answer different questions. Use those differences to plan the next formula comparison.

Canonical URL: https://cosmeticaffairs.com/blogs/ingredients/niacinamide-studies-formulation-concentration/

Author: [Cosmetic Affairs Editorial](https://cosmeticaffairs.com/authors/editorial/)
Published: 2026-10-27T00:00:00-04:00
Editorial date: 2026-10-21

Modified: 2026-10-27T00:00:00-04:00
Collection: Ingredients
Topics: Ingredients, Niacinamide, Claims

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AI-generated editorial illustration; not a photograph of actual products, laboratories, or events.

What should a niacinamide product do: improve the appearance of uneven skin, reduce visible shine, or support a hydration claim? The answer shapes which research is useful and which measurements a new formula will need.

Studies of skin appearance, surface oil, and barrier function used different formulas and endpoints. The comparison below is a guide to their questions, not a ranking of concentrations.

## What the studies examined

| Research discussed below | What was measured or investigated |
| --- | --- |
| 5% moisturiser study | Appearance measures over 12 weeks |
| 2% niacinamide study | Surface sebum and sebum excretion |
| Skin-lipid research | Lipid synthesis, skin lipids, and water loss |
| Pigmentation research | Melanosome transfer and facial pigmentation |

## What the 5% study tested

In a 2004 study, 50 white women aged 40–60 used a moisturiser containing 5% niacinamide and its control on opposite sides of the face. The randomised, double-blind trial lasted 12 weeks. Researchers reported improvements versus control in appearance measures including fine lines, pigmentation spots, texture, and red blotchiness. The authors were affiliated with Procter & Gamble. [Read the study abstract](https://pubmed.ncbi.nlm.nih.gov/18492135/).

The result applies to that moisturiser, population, regimen, and study period. A new serum needs evidence for its own claim. Deciding between 5% and 10% would require a comparison designed to test that difference.

## Surface oil and sebum excretion are different outcomes

A 2006 paper on 2% niacinamide reported reduced sebum excretion rate in its Japanese trial. In the trial involving white participants, casual surface sebum decreased, while the reduction in sebum excretion rate was not statistically significant. [Read the paper](https://pubmed.ncbi.nlm.nih.gov/16766489/).

A visible-shine claim needs an assessment of visible shine. Keep that endpoint separate from measurements of surface sebum or its excretion rate.

## Skin-lipid and pigmentation research

Tanno and colleagues studied nicotinamide, another name for niacinamide, in cultured human keratinocytes and in skin. They observed effects on lipid synthesis in the cell experiments; topical application increased certain stratum corneum lipids and reduced water loss in dry skin. [Read the study](https://pubmed.ncbi.nlm.nih.gov/10971324/).

Other work investigated melanosome transfer in laboratory models alongside facial pigmentation in clinical work. Together, these studies support specific lines of investigation. A cellular mechanism and a measured human outcome still need to be described separately.

## Choose a concentration for the intended benefit

Start with the intended benefit, user, application frequency, and time frame. Select candidate concentrations on a justified basis and compare closely matched prototypes where possible. If the base or process changes too, record the difference before attributing an outcome to niacinamide level.

Include application comfort and texture in development. A product people apply differently because of its feel may not reproduce the regimen assumed in a study.

Agree the claim endpoint and analysis with the testing team before work begins. State what photography, instrument readings, or participant reports will assess.

## Sources

- [Bissett and colleagues: Topical niacinamide and the appearance of ageing facial skin](https://pubmed.ncbi.nlm.nih.gov/18492135/).
- [Draelos and colleagues: The effect of 2% niacinamide on facial sebum production](https://pubmed.ncbi.nlm.nih.gov/16766489/).
- [Hakozaki and colleagues: Niacinamide, pigmentation and melanosome transfer](https://onlinelibrary.wiley.com/doi/abs/10.1046/j.1365-2133.2002.04834.x).
- [Tanno and colleagues: Nicotinamide, skin lipids and the epidermal permeability barrier](https://pubmed.ncbi.nlm.nih.gov/10971324/).