Niacinamide has become a staple ingredient in Korean skincare. It can be found in serums, creams, masks and even some sunscreens. But once you add a niacinamide product to your routine, one question often comes up: how long does it take to see the effects of niacinamide?
There is no single answer. It depends on what you are looking to improve: excess sebum, hyperpigmentation, blemishes and visible signs of aging do not change at the same rate. However, available research does provide some useful guidelines: some results have been observed after just a few weeks, while others require several months of consistent use.
How Long Does It Take to See Results from Niacinamide?
The timeframe depends on the concern being targeted, as well as the concentration and formulation of the product used.
Here are some of the main timeframes reported in research on niacinamide:
| Skin concern | Observed timeframe |
|---|---|
| Excess sebum | Results observed after 2 weeks |
| Hyperpigmentation | Results observed after 4 weeks |
| Blemishes | Results observed after 8 weeks |
| Visible signs of aging | Results observed after 12 weeks |
For sebum, the study by Draelos, Matsubara and Smiles, "The effect of 2% niacinamide on facial sebum production," published in the Journal of Cosmetic and Laser Therapy in 2006, followed participants using a cream containing 2% niacinamide. Among the Japanese participants, a reduction in sebum production was measured after 2 weeks. A second part of the study, conducted among Caucasian participants, showed a reduction in sebum after 6 weeks.
For this type of routine, Shifumie offers the Oily Skin Routine | 5 Steps, which includes the IVEL Niacinamide 5% Glow Boosting Serum among its five steps.
For hyperpigmentation, it takes a little longer to see the first results. In "The effect of niacinamide on reducing cutaneous pigmentation and suppression of melanosome transfer," published in the British Journal of Dermatology in 2002, Hakozaki and colleagues observed a significant reduction in hyperpigmentation after 4 weeks with a cream containing 5% niacinamide.
For a more complete approach, the Dark Spot Routine | 5 Steps combines niacinamide with alpha-arbutin, vitamin C derivatives and sunscreen.
For blemishes, a trial comparing a 5% niacinamide gel with a 2% clindamycin gel assessed results after 8 weeks in 60 women with mild to moderate acne.
Finally, for visible signs of aging, Bissett and colleagues, in "Niacinamide: A B Vitamin that Improves Aging Facial Skin Appearance," published in Dermatologic Surgery in 2005, followed 50 women for 12 weeks. The cream used contained 5% niacinamide and was applied twice daily. Improvements were observed in several aspects of skin appearance, including fine lines, wrinkles, hyperpigmentation and redness.
These results mainly provide a general timeframe. They do not mean that every skin will necessarily show an improvement after 2, 4 or 12 weeks. The most important thing is to give the product enough time before assessing its effectiveness.
What Does Niacinamide Do for the Skin?
Niacinamide, also known as nicotinamide, is a form of vitamin B3. Its appeal in skincare comes from its versatility: it can be used to address several skin concerns, from supporting the skin barrier to improving an uneven complexion.
A review published in 2024 in Drug Delivery and Translational Research, "Niacinamide: a review on dermal delivery strategies and clinical evidence," examines the available evidence on the topical use of niacinamide and its different effects on the skin.
It Helps Reduce Excess Sebum
Niacinamide can be useful when the skin tends to become shiny throughout the day. It can help reduce sebum production after 4 to 6 weeks of use.
If this is the type of result you are looking for, the IVEL Niacinamide 5% Glow Boosting serum is the Shifumie product best suited to this purpose. Its 5% concentration makes niacinamide a key active in the routine.
It Helps Support the Skin Barrier
The skin barrier plays an essential role: it helps the skin retain water and protect itself from external aggressors. Niacinamide can support its function by promoting the production of certain lipids found in the stratum corneum.
In "Nicotinamide increases biosynthesis of ceramides as well as other stratum corneum lipids to improve the epidermal permeability barrier," published in the British Journal of Dermatology in 2000, Tanno and colleagues studied the effect of niacinamide on the synthesis of ceramides and other stratum corneum lipids. Their work showed an increase in the synthesis of these lipids, along with a reduction in transepidermal water loss after topical application.
Another study, published in the International Journal of Dermatology in 2005 by Soma and colleagues, "Moisturizing effects of topical nicotinamide on atopic dry skin," compared a cream containing 2% niacinamide with petroleum jelly in 28 people with dry skin associated with atopic dermatitis. After 4 to 8 weeks, niacinamide had reduced transepidermal water loss. Both products improved stratum corneum hydration, but the niacinamide cream produced a greater improvement for this parameter than petroleum jelly.
Niacinamide can therefore have a place in a routine focused on maintaining skin hydration and comfort, not only in products designed for combination or oily skin.
It Helps Improve the Appearance of Dark Spots and Uneven Skin Tone
Niacinamide can be particularly useful when the complexion looks uneven or has areas of increased pigmentation.
The work of Hakozaki and colleagues helped clarify its potential in this area. Niacinamide acts on melanosome transfer, the process through which melanin-containing structures are transferred to epidermal cells. In their research, niacinamide reduced this transfer, which may help reduce the appearance of hyperpigmentation.
This is also one reason why niacinamide is often combined with other ingredients designed to improve radiance and even out the appearance of the skin tone.
At Shifumie, the Bano Bagi Alpha Radiance Melaclear Cream contains 20,000 ppm of niacinamide, equivalent to 2%. Its formula also combines vitamin C derivatives, Centella asiatica and hyaluronic acid. It is designed to care for uneven-looking skin and enhance radiance.
It Can Be Useful for Blemish-Prone Skin
Niacinamide is also used in skincare routines designed for blemish-prone skin.
In a trial published in 2013, Shahmoradi, Iraji, Siadat and Ghorbaini, "Comparison of topical 5% nicotinamid gel versus 2% clindamycin gel in the treatment of the mild-moderate acne vulgaris," compared a 5% niacinamide gel with a 2% clindamycin gel in 60 women with mild to moderate acne. After 8 weeks, acne severity had decreased in both groups.
It is important to note that this research focused on a niacinamide gel rather than all cosmetic products containing niacinamide. It therefore does not mean that every niacinamide serum will produce the same results. However, it provides interesting data on the use of this ingredient in products for blemish-prone skin.
It Can Also Be Part of an Anti-Aging Routine
Niacinamide can also be useful when the goal is to address several visible signs of skin aging.
In the study by Bissett and colleagues published in Dermatologic Surgery in 2005, a cream containing 5% niacinamide was used for 12 weeks. The researchers observed improvements in the appearance of fine lines and wrinkles, as well as skin texture, hyperpigmentation, redness and elasticity.
Niacinamide can therefore be included in an anti-aging routine without being limited to a single skin concern.
What Percentage of Niacinamide Should You Choose?
Today, you can find skincare products containing 2%, 5%, 10% niacinamide or more. But a higher concentration is not necessarily needed to achieve good results.
For many skin concerns, concentrations between 2% and 5% already have interesting supporting data. For example, the research discussed in this article used 2% for sebum and the skin barrier, and 5% for pigmentation and certain visible signs of aging.
There are also products containing 10% niacinamide or more. These concentrations may be suitable for certain needs, but they are not automatically more effective. They may also be less well tolerated by some skin types, especially when introduced too quickly.
Beyond the percentage itself, the quality of the formulation, consistent use and your skin's needs remain essential.
At Shifumie, you will find niacinamide products in different concentrations and textures. Discover all our niacinamide products and choose the formula that best fits your routine.
How Should You Add Niacinamide to Your Skincare Routine?
Niacinamide can be found in serums, creams, masks, toner pads and sunscreens. There is therefore no need to build an entire routine around this one ingredient.
If you are new to niacinamide, the simplest approach is to choose one product containing niacinamide and gradually introduce it into your routine. This allows you to see how your skin responds without changing several products at the same time.
Niacinamide can also be combined with other active ingredients. The key is to build a well-balanced routine in which each product has a clear purpose.
At Shifumie, niacinamide can be found, for example, in the Equlib Eau Briller Glass Toning Pads, which combine niacinamide with exfoliating acids, and in the Bano Bagi Hyaluronic Program Mask, formulated with hyaluronic acid, honey and niacinamide.
Niacinamide and Sunscreen: An Essential Combination for Dark Spots
If your goal is to improve the appearance of dark spots or maintain a more even-looking complexion, sunscreen has an important place in your routine.
UV rays can contribute to the development and worsening of pigmentation. Protecting your skin therefore helps limit one of the factors that can contribute to ongoing hyperpigmentation, alongside skincare products designed to improve its appearance.
The Equlib Eau Calm UV Serum SPF50+ PA++++ combines high UVA/UVB protection with niacinamide, green tea water and Houttuynia Cordata extract. It is used every morning as the final step of your skincare routine.
This is also why the Shifumie Dark Spot Routine | 5 Steps does not stop at targeted skincare: it finishes with SPF50+ PA++++ sun protection.
So, How Long Should You Wait Before Assessing a Niacinamide Product?
A few days are generally not enough to assess the effects of a niacinamide product.
Research provides different timeframes depending on the result being measured: results have been observed after 2 weeks for certain sebum-related parameters, after 4 weeks for hyperpigmentation, after 8 weeks in a study on blemishes and after 12 weeks for several visible signs of aging.
These timeframes are not a guarantee of results. They simply show that the skin needs time to change and that niacinamide should not be judged after just a few applications.
The simplest approach is to choose a product suited to your skin, use it consistently and monitor your skin over several weeks. With niacinamide, consistency is key to seeing results.
Niacinamide FAQ
Is niacinamide suitable for sensitive skin?
Niacinamide is used in many formulas designed for different skin concerns, including products intended to support the skin barrier. It is generally well tolerated, which is one reason for its popularity. Available research also shows potential benefits for several skin functions.
As with any skincare product, individual responses can vary depending on both your skin and the formula. If a product causes irritation, it is better to reduce how often you use it or stop using it rather than continue despite the discomfort. If the reaction is significant or persistent, seek advice from a healthcare professional.
Can niacinamide be combined with other active ingredients?
Yes. Niacinamide can be included in formulas containing several active ingredients and can also be part of a routine made up of different products.
The key is to keep your routine balanced and avoid adding products simply because they contain niacinamide. Every product should have a clear purpose in your routine.
Can niacinamide make a dark spot disappear?
Niacinamide can help reduce the appearance of hyperpigmentation, but it does not guarantee that every dark spot will disappear. Results depend on the type of pigmentation, the formulation used and how consistently the routine is followed.
A new, unusual or changing spot should not be treated with cosmetics alone. It should be assessed by a healthcare professional.
