In the world of cosmetics, few ingredients have such a solid and versatile scientific basis as niacinamide. Also known as vitamin B3 (or nicotinamide, depending on the context), it is a water-soluble active ingredient widely used for its ability to improve various aspects of the skin simultaneously: sebum balance, texture, uneven tone, redness, and early signs of aging.
In this guide, you will see what niacinamide is, what it is used for, how to use it, and what the evidence says about its benefits, with linked public sources.
Important note: Topical niacinamide (cosmetic) is not the same as oral nicotinamide (supplement). In the article, we differentiate between both uses when applicable.
What is niacinamide and how does it work on the skin?
Niacinamide is an active form of vitamin B3. In cosmetics, it stands out for its multi-target approach: it helps improve overall skin health by supporting processes related to the barrier function, inflammation, and tone.
It is considered an ingredient with good tolerability for most skin types and is usually easily integrated into cleansing, treatment, and moisturizing routines.
Benefits of niacinamide (with evidence)
1) Strengthens the skin barrier
One of its most consistent benefits is its support for the skin barrier. Studies have described that niacinamide can stimulate the synthesis of ceramides and other lipids in the stratum corneum, which is associated with better water retention and less transepidermal water loss.
Reference: Tanno et al., 2000.
2) Helps regulate sebum and improves the appearance of pores
In combination or oily skin, niacinamide is used for its ability to promote a more balanced appearance. In real-world use studies with cosmetic products containing it, improvements in parameters such as hydration and overall appearance have been observed after several weeks. Recent example (cosmetic study under real-world conditions): Załęcki et al., 2025 (Applied Sciences).
3) Support in acne and blemishes
Clinical evidence suggests that topical formulations with niacinamide may be comparable to topical antibiotics in moderate inflammatory acne, with the added benefit of avoiding the problem of bacterial resistance associated with antibiotics.
- Double-blind trial (8 weeks): 4% nicotinamide gel vs 1% clindamycin gel:
- Double-blind trial (moderate inflammation): 4% nicotinamide gel vs 1% clindamycin gel: Khodaeiani et al., 2013.
4) More even skin tone and hyperpigmentation
Niacinamide is used in cosmetics to help improve uneven skin tone and the appearance of dark spots. It is often described as an active ingredient that promotes more even skin tone with continued use. (Response and timeframe vary depending on skin type, consistency, and overall routine.) 5) Soothes and reduces redness (sensitive skin) Due to its tolerance profile and its common use in formulas for sensitive skin, niacinamide is frequently incorporated into routines that aim to reduce the feeling of reactivity and redness. 6) Antioxidant and anti-aging support In anti-aging routines, niacinamide is used to support the improvement of the appearance of fine lines and elasticity, primarily due to its role in hydration, barrier function, and skin comfort. Niacinamide and the skin microbiome Possible relationships between niacinamide and skin balance (including the idea of supporting a more stable skin environment) are explored in the cosmetic literature. As with many microbiome concepts applied to cosmetics, it should be presented as a developing line of research and not as a guaranteed solution for all cases.
Oral Nicotinamide and Non-Melanoma Skin Cancer: What the Evidence Says
Some studies have evaluated oral nicotinamide (supplementation) in relation to the risk of non-melanoma skin cancer. A cohort study (with large sample size data) published in 2025 reported an association with a reduced risk of skin cancer, with a greater effect when started after the first skin cancer. Source in PubMed: Breglio et al., 2025.
Important: This refers to oral supplementation and a specific clinical context. It does not replace classic prevention measures (sun protection, appropriate clothing, dermatological checkups) nor does it imply that a cosmetic with niacinamide "prevents" skin cancer.
How to incorporate niacinamide into your routine
Niacinamide in the cleansing step
A good entry point for this active ingredient is cleansing, especially if you're looking for a gentle and balancing step.
For example, a cleansing milk with niacinamide like Niacinamide Cleansing Milk – 100 ml can help cleanse without feeling tight and leave the skin ready for the next steps.Recommended Order (General)
- Morning and/or evening: cleanser.
- After: serum or treatment (if using).
- Then: moisturizer.
- In the morning: broad-spectrum sunscreen.
Niacinamide is an all-rounder cosmetic ingredient: it stands out for Its versatility, good tolerance, and evidence in key areas such as skin barrier, balance, and comfort make it a valuable addition to any skin. Consistent integration, with realistic expectations and a coherent routine, is often the most effective way to see results.
Frequently Asked Questions about Niacinamide
What does niacinamide do for the skin?
It is used to support the skin barrier function, improve balance (especially in combination/oily skin), help with the appearance of pores, uneven tone, and redness, and provide skin comfort.
Is niacinamide suitable for sensitive skin?
Generally, yes. It is generally considered well-tolerated, but as with any active ingredient, it should be introduced gradually if the skin is very reactive.
How long does it take to see results from niacinamide?
It depends on the goal and consistency. Changes in comfort and hydration may be noticeable sooner; Uneven skin tone and texture usually require several weeks of continuous use.
Can niacinamide be used with vitamin C or retinol?
Normally, yes. It's a common combination. If your skin is sensitive, it helps to space out applications and adjust frequency to avoid irritation.
Does a cosmetic with niacinamide prevent skin cancer?
No. The cited evidence regarding risk reduction refers to oral nicotinamide in clinical settings and does not replace sun protection or dermatological checkups.
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