What niacinamide does for skin
Niacinamide works through several distinct mechanisms depending on concentration. At 2–5%, it inhibits the transfer of melanosomes (melanin packets) from melanocytes to skin cells, visibly reducing hyperpigmentation and uneven tone over 4–8 weeks. At 5–10%, it reduces sebum production by normalising the activity of sebaceous glands, shrinking the appearance of enlarged pores and reducing oiliness and shine.
It also reinforces the skin barrier by increasing ceramide and fatty acid production in the epidermis. A stronger skin barrier retains moisture better, reducing transepidermal water loss (TEWL) and making skin more resilient to environmental stressors, irritants, and active ingredients.
Who benefits most from niacinamide
Niacinamide is one of very few actives that genuinely suits all skin types. For oily and acne-prone skin, it reduces sebum, tightens pores, and has mild anti-inflammatory properties that calm breakouts. For dry or sensitive skin, it strengthens the barrier and improves moisture retention. For mature or pigmentation-prone skin, it fades discolouration and complements anti-ageing routines.
For South African patients with Fitzpatrick Type III–VI skin, niacinamide is a particularly valuable first-line pigmentation treatment because it is non-irritating. Unlike some brightening ingredients, it does not carry a risk of triggering paradoxical darkening or post-inflammatory hyperpigmentation, making it safe to use continuously without breaks.
How to use niacinamide effectively
Niacinamide is water-soluble and best applied as a serum after cleansing and before heavier moisturisers. It is compatible with almost every other skincare ingredient — including retinol, AHAs, vitamin C, and SPF. The old advice that niacinamide and vitamin C should not be combined has been shown by modern research to be unfounded; the reaction that causes flushing only occurs at high temperatures not relevant to skincare.
Use a 10% niacinamide formulation twice daily for visible results on pores and pigmentation within 4 weeks. It can be used indefinitely as a maintenance ingredient with no requirement to cycle off.