Sebum

Your Skin's Own Moisturizer

Sebum is a complex mixture of lipids produced by sebaceous glands located in the dermis. It contains triglycerides, wax esters, squalene, free fatty acids, and cholesterol. This mixture flows through pores to the skin surface, where it spreads into a thin layer that lubricates the skin, prevents excessive water loss, maintains the slightly acidic pH of the skin surface (the acid mantle), and provides antimicrobial protection through the fatty acids it contains.

Too Much and Too Little

Overactive sebaceous glands produce excess sebum, which gives skin a shiny, greasy appearance and contributes to acne development. When excess sebum mixes with dead skin cells inside a pore, it forms a plug (comedone) that can become a blackhead or whitehead. Hormones, particularly androgens, are the primary driver of sebum production, which is why acne peaks during puberty and can flare during hormonal shifts.

Underproduction of sebum leads to dry, tight, and easily irritated skin. The skin's barrier weakens without adequate lipid protection, and transepidermal water loss increases. Sebum production naturally decreases with age, which is one reason skin becomes drier and more fragile in later decades.

Smart Sebum Management

The goal is balance, not elimination. Stripping sebum away with harsh cleansers triggers a rebound effect: the skin detects the oil deficit and ramps up production, creating a cycle of over-cleansing and over-producing. Gentle cleansing preserves some sebum. Lightweight moisturizers signal the skin that adequate lipid protection is present, potentially moderating production. Ingredients like niacinamide and jojoba oil (which mimics sebum's composition) help regulate output without disruption.