Niacinamide Serums & Skincare Products

Niacinamide

Brighten and strengthen with Niacinamide—refining tone, calming redness, and boosting barrier resilience for visibly balanced, radiant skin.

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#1 The Strengthening Serum

$126.00

The Protect Daily Duo

$405.90 $451.00

#1 The Hydragel

$244.00

#1 The Strengthening Crème

$229.00

#1 The Mask

$108.00

Suited to

["Resilient skin"]

The Anti-Ageing Trio (Resilient)

$589.05 $693.00

The Discovery Travel Kit

$545.00

The Illuminating Body Duo

$137.00

The Illuminating Body Cleanse

$66.00

The Illuminating Body Crème

$86.00

The Anti-Ageing Trio (Sensitive)

$607.75 $715.00

Frequently Asked Questions

What is niacinamide?

Niacinamide, also known as Vitamin B3, is a water-soluble molecule and one of the most clinically studied actives in skincare. It works as a key component of our Vitamin B Complex within The Strengthening Collection, supporting healthy barrier function, regulating sebum, and helping calm the appearance of redness. Niacinamide is well tolerated by all skin types, including sensitive and reactive skin.

What does niacinamide do for skin?

Niacinamide supports a wide range of skin functions: it strengthens barrier integrity, regulates sebum production, refines the appearance of pores, calms the look of redness, and supports an even skin tone. By improving the skin's resilience to solar and environmental damage, it forms the foundation of a strengthened, balanced complexion.

What are the benefits of niacinamide for skin?

The benefits of niacinamide include strengthened barrier function, refined appearance of pore size, regulated sebum, calmer-looking redness, brighter and more even tone, and improved skin resilience. Because it is a Skin Identical molecule, niacinamide is suitable for daily use across all skin types and pairs effectively with most other actives in a RATIONALE Ritual.

Which RATIONALE formulations contain niacinamide?

Niacinamide is the cornerstone of The Strengthening Collection. It features in #1 The Strengthening Serum (normal-combination skin), #1 The Strengthening Hydragel (hydration-focused), #1 The Strengthening Crème (dry skin), and #1 The Strengthening Mask (resilient skin). Each formulation pairs niacinamide with supporting actives tailored to specific skin types.

Can I use niacinamide with Vitamin C?

Yes. Modern formulation science has confirmed that niacinamide and Vitamin C layer effectively and complement one another in an daytime skincare routine. Niacinamide supports barrier function while Vitamin C delivers antioxidant defence and brightening benefits. RATIONALE formulations are created to work in synergy across The Strengthening and Brightening Collections.

Is niacinamide suitable for sensitive skin?

Yes. Niacinamide is one of the most universally well-tolerated actives in skincare and is often recommended for sensitive, reactive, or barrier-compromised skin. It works to calm the appearance of redness while supporting overall skin resilience. We always recommend introducing new formulations gradually and consulting our Client Services Team for personalised guidance.

When should I apply niacinamide?

Niacinamide is most effective as part of a morning skincare ritual, applied after cleansing and before Brightening and Brilliance formulations. Daily use supports cumulative benefits in barrier resilience and the appearance of skin tone.