Niacinamide Simply Explained

1. What It Is About

Niacinamide is a form of vitamin B3. In science it is often also called nicotinamide. The substance dissolves well in water and is converted in the body into substances that help with energy production. This is well established. In studies, niacinamide is almost always tested together with other substances, for example in creams with salicylic acid, ceramides or vitamin C. Then it cannot be said which part of the effect comes from niacinamide itself. Some studies also examine niacinamide as a tablet, for example in dialysis patients. Research focuses primarily on the skin and on tolerability. Other areas such as fatigue or the immune system are represented by only individual studies.

2. What Studies Show

The skin has been studied the most. A large review of creams for mild to moderate acne included 4.440 participants. It covers many different creams, and niacinamide is one of them 1. Another large study with 2.023 participants tested body care products containing niacinamide and found that they were well tolerated 2. In a study with 300 participants, a salicylic acid cream with niacinamide was tested for chloasma, a pigmentation disorder. The combination was effective and safe 3. Another study with 99 participants compared two creams with tranexamic acid and niacinamide against a hydroquinone cream for melasma. Tolerability was also confirmed here 5. In acne, a cream with ceramides and niacinamide together with acne treatment improved pimples and reduced skin irritation; no serious adverse effects occurred 6. A cream with benzoyl peroxide and niacinamide reduced sebum production and brightened the skin 7. An oral study with 26 dialysis patients examined niacinamide as a tablet and observed changes in phosphate levels. Three participants discontinued the study due to adverse effects 4.

3. What Remains Unclear

Almost all controlled studies test niacinamide in combination with other substances. Therefore the effect of the single substance has not yet been clarified. Many studies are open, not randomised or small pilot studies. Some of the measured values are cosmetic parameters such as pigmentation or moisture, not the clinical course of a disease. Studies on absorption, protein binding, degradation via CYP enzymes, the upper limit of oral intake and toxicity in overdose are still outstanding. It is also open whether the local irritation rate depends on the amount and whether it changes with longer use. The most cited work in the field is a mechanism review, not a clinical trial. Frequent citation says nothing about the strength of evidence.

4. What This Means in Everyday Life

Niacinamide is found in many skin creams, often together with other active ingredients. Tolerability with topical use is well documented in several studies. Whether niacinamide alone provides a benefit cannot be deduced from these studies. Anyone interested in a product can look at the list of ingredients and recognise that niacinamide is usually only one component. For oral intake there are individual studies, but no established upper limit. A study would have to clarify which effect remains when niacinamide alone is tested against a comparison group. It is also open how topical and oral administration differ in absorption, distribution and effect at the target tissue.

All Details with Study Numbers and Sources: detailed page on Niacinamide. For Children: Niacinamide for Children.