Niacinamide (vitamin B3) is one of the most well-studied ingredients in skincare. This guide covers what it does, how strong the evidence is, how it compares to newer actives like NAD+ and peptides, and where marketing may exceed the evidence.
What Niacinamide Actually Does
Niacinamide has decades of peer-reviewed research supporting its use for:
- Reducing the appearance of dark spots and hyperpigmentation
- Supporting the skin barrier by boosting ceramide production
- Minimising the appearance of pores and fine lines
- Reducing inflammation and redness
- Regulating sebum production in oily skin
- Being stable, non-irritating, and compatible with most other ingredients
This is not emerging science. It is well-established, textbook dermatology.
Evidence Strength
| Claim | Evidence Status | |-------|----------------| | Niacinamide improves the appearance of hyperpigmentation | ESTABLISHED (decades of research) | | Niacinamide supports the skin barrier | ESTABLISHED | | Niacinamide reduces the appearance of pores and fine lines | SUPPORTED | | Niacinamide regulates sebum production | SUPPORTED | | Niacinamide is well-tolerated by sensitive skin | ESTABLISHED |
Why It Remains Common
Niacinamide is widely used because it is effective, affordable, stable, and compatible with most other ingredients. It is off-patent, which means it is inexpensive to produce and available from many brands at various price points.
This is a strength, not a weakness. An ingredient that is affordable, well-studied, and broadly compatible is a useful foundation for a routine.
How It Differs from NAD+ and Peptides
Niacinamide is a NAD+ precursor—the body converts it into NAD+. It has decades of published research on skin benefits.
NAD+ is the active molecule involved in cellular energy processes. In skincare, it is used as a topical ingredient, but the evidence for topical NAD+ specifically is still emerging. Niacinamide currently has the stronger evidence base for topical use.
Peptides are short chains of amino acids that signal the skin to support collagen production. They have a growing but less established evidence base than niacinamide.
These ingredients are not mutually exclusive. Niacinamide can be used alongside NAD+ and peptides in a routine. For more on how NAD+ compares, see our NAD+ timeline guide and premium NAD+ serum guide.
The Flushing Myth
A common concern about niacinamide is the "flushing" scare. This comes from confusion between two different molecules:
- Niacin (nicotinic acid) can cause flushing—a harmless but uncomfortable vasodilation that reddens the skin.
- Niacinamide (nicotinamide) is the amide form and does not cause flushing.
They are chemically distinct. Niacinamide is one of the best-tolerated actives available, even for sensitive and reactive skin.
Compatibility with Vitamin C
Another persistent myth is that niacinamide cannot be used with Vitamin C. This originated from a single outdated study using unstable, non-stabilised L-ascorbic acid in conditions that do not reflect modern formulations. Decades of subsequent research and dermatologist consensus confirm that niacinamide and Vitamin C are compatible and can be used together.
Where Marketing May Exceed Evidence
While niacinamide is well-studied, some marketing may overstate what it can do. Niacinamide will not:
- Erase deep wrinkles
- Replace professional treatments
- Work overnight
- Treat diagnosed skin conditions
It is a proven, reliable ingredient for supporting the appearance of even tone, barrier health, and pore size—but it is not a miracle. Consistent use over weeks to months is what produces visible results.
The Bottom Line
Niacinamide is a well-established, affordable, broadly compatible skincare ingredient with decades of research behind it. It does not need to be positioned against newer, more expensive actives—it can be used alongside them. The strongest evidence supports niacinamide as a foundational ingredient for most routines, regardless of what other actives you choose to include.
For more on how niacinamide fits into a complete routine, see our serum layering order guide.