If you look at the ingredient list of a hair serum or scalp treatment today, you'll increasingly find niacinamide. The ingredient gained popularity in skincare products in recent years and has since made its way into hair products.
But what exactly does niacinamide do?
What is niacinamide?
Niacinamide is a form of vitamin B3, also known as nicotinamide. It is a water-soluble vitamin naturally found in foods such as meat, fish, nuts, and legumes. Your body can also produce it from tryptophan, an amino acid.
In skincare, niacinamide has been known for years for its broad action: it strengthens the skin barrier, reduces redness, regulates sebum production, and has anti-inflammatory properties. For hair products, the mechanisms are the same, but applied to the scalp.
What does niacinamide do for your scalp?
The scalp is also just skin. That sounds logical, but it's often forgotten in the hair care world. Sebaceous glands, hair follicles, the skin barrier – all these structures respond to ingredients that also work in facial skincare.
Niacinamide has several specific effects on the scalp:
- Strengthening the skin barrier — niacinamide increases the production of ceramides in the skin. Ceramides are fats that hold skin cells together and prevent moisture loss. A healthy scalp barrier means less irritation, less flaking, and a better environment for hair follicles.
- Regulation of sebum production — an oily scalp and excessive sebum production can clog hair follicles and trigger inflammation. Niacinamide helps normalize sebum production, which for some people contributes to less follicular blockage.
- Reduction of oxidative stress — free radicals, caused by UV radiation, pollution, and stress, damage cells on the scalp and can weaken hair follicles. Niacinamide has antioxidant properties and protects cells from oxidative damage.
- Influence on cellular aging — a study published in PMC showed that niacinamide lowers the protein expression of p16 and p21, two markers of cellular aging. Aged cells in the dermal papilla, the part of the hair follicle that drives growth, can slow down hair growth. Niacinamide appears to inhibit this aging.
- Lowering of DKK-1 — DKK-1 is a protein that keeps the hair follicle in the resting phase and inhibits growth. Research shows that niacinamide lowers the expression of DKK-1 in human dermal papilla cells, which is theoretically beneficial for hair growth.
Does it really work for hair loss?
Here's where it gets honest. Because there's a nuance you won't find in many product descriptions.
A review article in the International Journal of Dermatology (2020) concluded that, based on existing evidence, topical niacinamide does not directly stimulate hair growth. The effects seen in laboratory settings do not automatically translate to clinically measurable hair growth in humans.
What we do have: a small-scale pilot study where women with hair loss showed a statistically significant improvement in hair density and hair volume after six months of using a niacinamide preparation, measured via blind photo assessment.
One small study, primarily in women. That's not strong evidence.
The honest conclusion: niacinamide is not an ingredient that by itself stops hair loss or significantly stimulates hair growth. But it does contribute to a healthier scalp, and that is not an unimportant factor.
The scalp as a basis for hair growth
This is something that is often overlooked in discussions about hair loss. The focus is almost always on stopping DHT, activating hair follicles, or stimulating blood circulation. These things are important. But the condition of the scalp itself also plays a role.
An inflamed, dry, or oily scalp provides a poorer environment for hair growth. Ingredients that keep the scalp healthy, including niacinamide, are therefore useful as part of a broader approach.
They are not the components that solve everything, but they support the effectiveness of more active ingredients such as Redensyl, Procapil or caffeine.
Niacinamide in combination with other ingredients
Niacinamide works well with active hair growth ingredients:
- Caffeine directly stimulates the hair follicle and inhibits DHT at the cellular level. Niacinamide supports the scalp on which caffeine acts.
- Redensyl and Procapil activate hair follicle cells and extend the growth phase. Niacinamide reduces cell aging and inflammation that can inhibit this activation.
- Rosemary has proven anti-inflammatory effects on the scalp, through mechanisms different from niacinamide.
Combination products that contain niacinamide alongside proven active ingredients are more meaningful than products that rely solely on niacinamide. The Hairborn Growth Serum combines a range of active ingredients with supporting components for a complete approach to hair loss.
How to use niacinamide for your scalp?
If you use a serum or treatment with niacinamide, there are a few practical points to consider:
- Apply it to a clean scalp. Dirt and sebum reduce the absorption of active ingredients. Preferably use it directly after washing.
- Massage it in well. Not only for better absorption, but also for blood circulation to the scalp.
- Use it consistently. One-time or sporadic use has little effect. Give it at least 8 to 12 weeks before forming an opinion.
- Combine with a complete approach. Diet, sleep, and stress management also affect your scalp. Niacinamide is not a substitute for a healthy foundation.
Side effects
Niacinamide is generally well tolerated. Side effects are rare. In some people, high concentrations may cause slight irritation or redness during the first applications. This usually disappears on its own.
Do not confuse niacinamide with niacin (nicotinic acid). Niacin can cause a so-called flushing reaction, a temporary red color and feeling of warmth on the skin. Niacinamide does not produce that effect.
Conclusion
Niacinamide is not a miracle cure for hair loss. But it is also not a useless ingredient.
It strengthens the skin barrier, regulates sebum, inhibits cell aging in the hair follicle, and reduces inflammation on the scalp. These are valuable contributions, especially as part of a serum that also contains active hair growth ingredients.
Anyone who buys niacinamide as a standalone solution with the expectation of visible hair growth in eight weeks will be disappointed. Those who see it as a supportive part of a consistent routine are much closer to reality.
Frequently Asked Questions
Can you continue to use niacinamide daily without habituation?
Yes, niacinamide does not cause habituation and does not lose its effectiveness with long-term use. It is a stable ingredient that you can safely continue to use daily for months. In fact, its supportive effects on the scalp barrier and sebum regulation benefit from consistent, long-term use rather than intermittent use.
Is niacinamide suitable for a sensitive or irritated scalp?
Yes, niacinamide is known as one of the milder active ingredients and is often recommended for sensitive skin, including in facial care. For an irritated scalp, it can even be soothing due to its anti-inflammatory properties. However, for a severely irritated scalp, test it on a small area first before applying it to the entire scalp.
Can you combine niacinamide with minoxidil?
Yes, you can do that without problems. Niacinamide works on the condition of the scalp itself, while Minoxidil works on the hair follicle through vasodilation. There is no known negative interaction between the two, and some people deliberately use a niacinamide serum alongside Minoxidil to limit scalp irritation.
Does niacinamide also help against dandruff?
Due to its sebum-regulating and anti-inflammatory action, niacinamide may contribute to a healthier scalp, but dandruff often has a fungal component that niacinamide does not directly address. For persistent dandruff, a targeted antifungal agent usually works better. Niacinamide can then at best play a supportive role alongside such treatment.
Is niacinamide also found in regular shampoos, or only in serums?
Niacinamide is now found in both forms, but in a serum it stays on the scalp longer than in a shampoo that you rinse off after a few minutes. For a noticeable effect on the scalp barrier, a leave-on formula such as a serum is the more logical choice, for the same reason why other active substances also work better in a serum than in a shampoo.
Can you use too much niacinamide?
Applying it extra often does not accelerate the effect and primarily increases the chance of slight irritation in a sensitive scalp. Follow the recommended frequency on the label, usually once daily. Using more than recommended has no proven additional benefit for the scalp or hair follicle.
Is niacinamide safe to combine with a dermaroller?
Yes, niacinamide is one of the milder ingredients and can be perfectly combined with a dermaroller, provided you follow the same order as with other active substances: first roll, then apply the serum once the scalp has settled down. Its anti-inflammatory action can even contribute to a calmer scalp after rolling.
Does niacinamide work faster on an oily scalp than on a dry scalp?
Niacinamide regulates sebum production, so for a naturally oily scalp, the effect on sebum balance may be more noticeable than for a dry scalp. For a dry scalp, the added value primarily lies in strengthening the skin barrier. In both cases, the effect is gradual and only noticeable after weeks, not immediately.
Can you use niacinamide if you also take vitamin B3 supplements?
Yes, you can do that without problems. Niacinamide you get through food or supplements works throughout your body via your bloodstream, while topically applied niacinamide acts directly on the skin cells of the scalp itself. There is no known interaction between the two forms of administration, and many people use them alongside each other without problems.
Is there a difference between niacinamide from a serum and niacinamide from food?
Yes, there is a difference. Niacinamide from food is processed by your body and distributed where it is needed, with little targeted influence specifically on the scalp. Topically applied niacinamide in a serum acts directly on the skin cells of the scalp itself. For a targeted effect on the scalp, topical application is therefore more effective than just nutrition.
