Niacinamide: what it's really for on the face (and the myth of high percentages)

If you've searched for what niacinamide is used for, you've probably come across a wall of "10%" and "20%" serums with promises that all sound similar. First thing to clarify, because it will save you money: that big number on the label is almost always marketing. Beyond 5%, scientific evidence doesn't improve – only the risk of irritation increases. So no, you don't need the most concentrated serum on the shelf.

Niacinamide is perhaps the most studied cosmetic active ingredient, and it is also one of the most misunderstood. Below, you'll find out what it really does for men's skin (with the evidence behind each claim), why high percentages are a trap, how it interacts with glycolic acid and vitamin C, and how to incorporate it into your routine without buying yet another separate product. No hype. Just what stands up to scrutiny.

What is niacinamide (vitamin B3) and why is it so widely studied?

Niacinamide is one of the forms of vitamin B3, also known as vitamin PP or nicotinamide. Pay attention to a distinction that will be useful later: B3 exists in two forms, niacinamide (or nicotinamide) and niacin (or nicotinic acid). These are two different molecules, with different behaviors on the skin. In cosmetics, niacinamide is used, and it's important not to confuse them.

The reason dermatologists call it a "multi-tasking" active is simple: it acts on multiple fronts simultaneously, and for most of these effects, there are serious clinical studies, not just marketing claims. It regulates sebum (the skin's natural oil), strengthens the skin barrier (the outermost layer that retains water and keeps out aggressors), evens out skin tone, and calms redness. Few ingredients cover so much ground with as much evidence behind them.

For men's skin — which is typically oilier, daily stressed by shaving, and thus prone to shininess and minor redness — this "multi-tasking" profile makes particular sense. It's not a niche active for a single problem: it's a foundational all-rounder.

Niacinamide: what it's really used for on the face (the real benefits)

Here lies the core of the matter. Niacinamide is used for four concrete things, each with measurable clinical evidence. We will look at them one by one, with an explanation of why they work.

• Regulates sebum. In a study of 100 Japanese participants, topical 2% niacinamide significantly reduced the rate of sebum production over 4 weeks; in the arm with Caucasian participants, what dropped was surface sebum — the shine you actually see — rather than the production rate. Translated for those with skin that shines by mid-day: less excess oil, more refined texture.
• Strengthens the barrier by increasing ceramide production. Ceramides are the "fats" that hold together the cells of the outermost layer, like mortar between bricks. Niacinamide stimulates the skin to synthesize more of them (along with other lipids like cholesterol and fatty acids), increases ceramides in the stratum corneum, and reduces water loss through the skin. A stronger barrier means less dryness, less "tight" skin after shaving, less reactivity.
• Evens skin tone and reduces post-blemish marks. Those dark spots that remain where a pimple once was (post-inflammatory hyperpigmentation) depend on melanin that melanocytes pass to surface cells. Niacinamide reduces this transfer — in laboratory studies, inhibition ranges from 35% to 68% — and in real-world use, 5% reduced hyperpigmented spots compared to the vehicle after 4 and 8 weeks. Good to know: the effect is gradual and reversible (if you stop, the tone tends to return to what it was), and it is not a medical cure.
• Calms redness. In a study on photoaged skin, 5% niacinamide reduced redness, spots, and other signs over 12 weeks. For skin often irritated by a razor, the soothing component is not a minor detail.

A note on methodology, because honesty matters here: the clinically effective range in studies is roughly between 2 and 5%. And not all effects kick in at the same dose — for example, 2% alone, in some studies, did not show a statistically significant effect on spots, while 5% did. This is the first clue that "higher" is not automatically "better": there is a useful window, not an infinite scale.

Niacinamide's effect on pores: less visible, not "closed"

A clarification that almost no one makes, and one that saves you from wrong expectations. Niacinamide does not physically close or shrink pores: pores are not muscles; they don't open and close on command. What happens is different and more interesting.

A pore appears enlarged mainly when it is stretched by the sebum that fills it. By reducing sebum production, niacinamide makes the pore appear less stretched and therefore less visible. In one study, 4% reduced both pores and texture irregularity after 8 weeks. The difference between "less visible" and "closed" is not nitpicking: it's the difference between a promise that can be kept and a lie. If you're looking for the complete picture on this topic, we've covered it in blackheads and enlarged pores in men and in oily skin, sebum, and pores in men.

The myth of high percentages: 10%, 15%, 20% serums

Let's return to where we started, because this is where you'll spend your money worst. The race for the highest number – the niacinamide serum at 10, 15, 20% – is a marketing phenomenon, not dermatology.

The data clearly states that niacinamide is well-tolerated at commonly used concentrations (below 5%), and the range where studies show benefits is approximately 2-5%. Beyond that threshold, there is no demonstrated additional benefit; what increases is the likelihood of irritation. Dermatologists involved in formulation have confirmed this for years: pushing beyond 5% rarely adds anything useful.

When placed in a table, the picture is clear: the evidence grows up to about 5% and then stops, while the risk does not.

Concentration	Documented effect	Risk
2%	Less surface sebum (shine)	Very low
4%	Less visible pores, more even texture	Low
5%	Reduced spots, diminished redness	Low
Over 5%	No additional demonstrated benefit	Increasing (irritation)

So why do 20% serums exist? Because a big number sells. It's easier to put "20%" on the front of the bottle than to explain to a customer that a well-formulated 5% does the same job with less risk. The uncomfortable truth is that, beyond a certain dose, you're buying a number, not a result.

This is why niacinamide in PURIFY is present in a functional, not showcase, concentration: the dose chosen to work in tandem with the exfoliant, not to print an impressive number on the label. We do not advertise the exact percentage as a selling point, precisely because the number, beyond the useful window, is irrelevant.

Niacinamide and Glycolic Acid together: the PURIFY project

One of the most frequent questions is whether niacinamide and glycolic acid can be used together. The answer is not only yes, it's precisely why some products combine them in the same formula. They are complementary.

Glycolic acid is an AHA (alpha-hydroxy acid, an exfoliating acid that dissolves the "glue" between dead surface cells and speeds up skin cell turnover). It does a "forward" job: it renews the texture, but by its nature, it can stimulate and, if used without discretion, dry out the skin. Niacinamide does the complementary work: it regulates sebum, strengthens the barrier, and calms. One accelerates, the other controls the side effects of the first. It's a rational pairing, not a random combination.

This is exactly the goal of PURIFY, the HBSKN night exfoliant: 7% glycolic acid that renews, niacinamide that regulates and calms, plus medium molecular weight hyaluronic acid and rose water, at pH 3.5/4.0 and fragrance-free. Not two products to layer, hoping they'll get along: two active ingredients designed together, in the right dose, within a single formula. If you want to deeply understand what AHA does, we've explained it in glycolic acid on the face: what it's for and in the comparison glycolic or salicylic.

The fake problem: niacinamide + vitamin C

There's a persistent myth that niacinamide and vitamin C "cannot be mixed." It's the kind of rule that circulates from blog to blog without anyone checking its origin. So, where does it come from?

From outdated studies where niacinamide was combined with ascorbic acid (pure vitamin C) under extreme conditions: high heat, very low pH, and long periods. In those conditions, some niacinamide could convert to niacin (nicotinic acid, the other form of B3), which can cause flushing (a transient redness, a hot flash). However, these are laboratory conditions, far from how a cream or serum is actually formulated and used.

In modern cosmetic formulations, at room temperature and the correct pH, the two active ingredients coexist without problems. And regarding flushing: that marked flush is typical of niacin; niacinamide causes it much less frequently, generally only in individuals sensitive to higher concentrations. At usual cosmetic doses (up to about 5%), it is among the best-tolerated active ingredients. If you've read that niacinamide "causes redness," it's often a confusion with niacin, which has a similar name but different behavior.

How to incorporate niacinamide into a man's routine

Let's get to the practical part, and here's good news for your wallet and bathroom space: you probably don't need to buy a separate niacinamide serum. If your routine already includes niacinamide where it's needed, you've already got it covered.

In the HBSKN system, niacinamide is found within PURIFY, which is a cyclical exfoliant: it's used in the evening for approximately 10 days a month, while on the other ~20 days, you return to hydration. It's not an everyday product: exfoliating too often weakens the barrier and achieves the opposite effect. To understand the right rhythm, we've written about how often to exfoliate your face. On the 10 nights of the cycle, niacinamide does its job exactly when needed: while glycolic acid renews, it keeps sebum and irritation at bay.

The underlying logic is that of skinimalism: a few coherent steps, each with a role, instead of accumulating overlapping bottles. A separate niacinamide serum, on top of a routine that already contains it, is redundancy—not an enhancement. If you're still building the foundations, start with men's skincare: where to start, then add exfoliation once the base is solid.

How HBSKN does it

To summarize the reasoning helpfully: niacinamide is an excellent and well-documented active ingredient, but its value is not in the highest number on the label — it lies in the right dose, the right molecule, and the right combination.

In HBSKN, niacinamide is not a stand-alone serum to show off, but a component of PURIFY, dosed in a functional concentration and paired with 7% glycolic acid because that's where it performs best: one renews, the other regulates and calms. You'll find it in the Purification Routine (CLEANSE + HYDRATE + PURIFY + PROTECT+), designed for oily, shiny, and uneven skin, with SPF50+ protection during the day and the 10-day monthly exfoliation cycle already orchestrated for you.

No medical promises, no inflated percentages for advertising purposes: just the right active ingredient, at the appropriate dose, at the moment it's needed. If your problem is sebum, shininess, and texture, this is where niacinamide stops being a buzzword and becomes part of a system.

---

Frequently Asked Questions