Niacinamide Serums & Skincare Products

Complimentary gift with all orders $250 or more

Take the Skin Questionnaire

Complimentary delivery on all orders

Complimentary gift with all orders $250 or more

Take the Skin Questionnaire

Complimentary delivery on all orders

The Gift Guide

Exclusive sets, limited-edition gifts and treatments designed to delight every complexion.

New to RATIONALE?

Learn our brand story and skincare philosophy. Your path to luminous skin starts here.

Take the Skin Questionnaire

Discover your prescribed RATIONALE Ritual in minutes.

SHOP PRODUCT Take the Skin Questionnaire All Formulations By Collection

Strengthening

B-Group Vitamins, including niacinamide, help fortify skin barrier function.

Brightening

Multi-Vitamin Complexes with Vitamin C help visibly brighten skin.

SPF

Zinc Fusion Technology elicits a radiant and protected complexion.

Nourishing

Intercellular Lipids and Ceramide Complex comfort and support skin barrier function.

Refining

Hydroxy Acids and Peptides restore a look and feel of radiant skin clarity.

Rejuvenating

Vitamin A Complex (incl. Retinal & Retinol) and Bakuchiol support skin turnover.

By Type

Serums SPF Cleansers Crèmes Hydragels Eye Crèmes Masks Shop All

By Skin Concern

Identifying Skin Concerns Hyperpigmentation Fine Lines + Wrinkles Dryness Dehydration Sensitivity + Redness Congestion Shop All

By Key Active

Niacinamide Retinol Zinc Oxide Hyaluronic Acid Vitamin C AHA/BHA Ceramides Shop All

Introductory Sample Sets Bestsellers

#1 The Serum

Strengthening serum for combination skin types.

From $69.00

#2 The Light Crème

Hydrating and calming cream for combination skin.

$123.00

#3 The Tinted Serum Broad Spectrum SPF50+

Superlative protective serum for all skin types.

$124.00

#4 The Cleanser

Gentle cream cleanser for all skin types.

From $69.00

#5 The Serum

Skin-refining serum for resilient skin.

$118.00

#6 The Night Crème

Rejuvenating night cream for all skin types.

From $67.00

The Body Collection Sets + Kits eGift Card

Exclusive sets, limited-edition gifts and treatments designed to delight every complexion.

New to RATIONALE?

Learn our brand story and skincare philosophy. Your path to luminous skin starts here.

Take the Skin Questionnaire

Discover your prescribed RATIONALE Ritual in minutes.

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Education

About Us RATIONALE Research Radiant Client Results Our Founder, Richard Parker The Journal

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Niacinamide

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

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United States USD

Australia AUD

United Kingdom GBP

New Zealand NZD