Niacinamide (Vitamin B3)

Overview

Niacinamide (INCI Niacinamide; also called nicotinamide) is the amide form of vitamin B3 — a water-soluble, cell-signaling vitamin and a precursor to the cofactors NAD+/NADP+. It is used topically (commonly at 2–5%) and studied for barrier, brightening, antioxidant and anti-inflammatory effects. Note: niacinamide (nicotinamide, CAS 98-92-0) is a different molecule from niacin (nicotinic acid, CAS 59-67-6) and should not be conflated.

How it works

Niacinamide is a precursor to the cofactors NAD+/NADP+, and its topical benefits are generally attributed to supporting NAD+/redox homeostasis. Proposed pathways include increasing ceramide and other stratum-corneum lipid synthesis (barrier support), antioxidant and anti-inflammatory activity, reduced transfer of melanin-containing melanosomes to keratinocytes (brightening), and sebum regulation. IMPORTANT: the precise molecular target is not fully established — clinical benefit is well documented, but the ingredient is presumed to act via NAD+/redox homeostasis (per the review literature) rather than through a single confirmed mechanism. It is commonly formulated at 2–5% (a consensus range).

• NAD+/redox homeostasis (presumed primary pathway)mechanistic

  Niacinamide is a precursor to NAD+/NADP+; its topical effects are generally attributed to supporting cellular NAD+/redox homeostasis. This is the presumed principal pathway — the precise molecular target is not fully established.

• Ceramide / barrier-lipid synthesiscell

  Reported to increase biosynthesis of ceramides and other stratum-corneum lipids, supporting the epidermal permeability barrier.

• Antioxidant / anti-inflammatory activitycell

  Reported antioxidant and anti-inflammatory activity.

• Reduced pigment (melanosome) transfercell

  Reported to reduce transfer of melanin-containing melanosomes from melanocytes to keratinocytes, contributing to brightening.

• Sebum regulationlimited

  Reported to help regulate sebum production.

Reported benefits

• Reported to support the skin barrier via ceramide/lipid synthesis
• Antioxidant and anti-inflammatory activity
• Reported skin-brightening via reduced melanosome transfer
• Reported sebum regulation

Evidence

Moderate

Rated moderate: niacinamide has real randomized controlled trials and broad clinical data across barrier, brightening and anti-aging endpoints — stronger than most cosmetic peptides — but the rating is tempered because its precise molecular target is not fully established (benefit is well documented; the mechanism is presumed to run via NAD+/redox homeostasis).

Forms & derivatives

Niacinamide (nicotinamide, CAS 98-92-0) is distinct from niacin (nicotinic acid, CAS 59-67-6) — different molecules with different properties. Niacin can cause a warm flushing sensation; niacinamide does not. The two should not be conflated.

References

1. Nicotinamide increases biosynthesis of ceramides as well as other stratum corneum lipids to improve the epidermal permeability barrier. British Journal of Dermatology. (Authors affiliated with Kanebo Ltd (a cosmetics manufacturer) — not independent.)Supports the ceramide / barrier-lipid synthesis claim.Cell / In Vitrodoi:10.1111/j.1365-2133.2000.03705.x →
2. Mechanistic Basis and Clinical Evidence for the Applications of Nicotinamide (Niacinamide) to Control Skin Aging and Pigmentation. Antioxidants (Basel). (independent — single-author academic review)Supports the well-documented clinical benefit with an unestablished precise molecular target, and the pigmentation claim.Reviewdoi:10.3390/antiox10081315 →
3. Mechanistic Insights into the Multiple Functions of Niacinamide: Therapeutic Implications and Cosmeceutical Applications in Functional Skincare Products. Antioxidants (Basel). (Several authors employed by commercial firms during the study — LOUNA REGENERATIVE SA, Albomed GmbH, TEC-PHARMA SA and LAM Biotechnologies SA — industry-affiliated, not independent.)Supports the multi-pathway mechanism framing.Reviewdoi:10.3390/antiox13040425 →

Frequently Asked Questions