Serums & Essences · 16/06/2026
The Joseon royal court beauty elixir that turned into a K-beauty serum — and what the science discovered about glow
Joseon court beauty records document a "glow elixir" of fermented grains and ginseng root — modern cosmetic science has since identified the specific ginsenoside mechanisms that produce the skin luminosity effect this elixir was prized for.
What "glow" means in K-beauty skin science — and why it is distinct from "brightness"
K-beauty distinguishes between brightness (evenness of skin tone — the absence of hyperpigmentation and discolouration) and glow (the luminosity and light-reflectiveness of the skin surface — determined by surface smoothness, optimal hydration and translucency of the stratum corneum). A skin that is bright but not glowing appears clear but flat; a skin that glows appears radiant and three-dimensional. The glow state requires: adequate skin water content in the stratum corneum (dehydration scatters light rather than reflecting it), optimal surface lipid film (which creates the light-reflecting smoothness), and healthy cell turnover rate (new cells are more translucent than aged, oxidised surface cells). Ginseng ginsenosides contribute to all three through complementary mechanisms.
How ginsenosides produce the glow effect — the three-mechanism model
Ginsenoside Rb1 stimulates aquaporin-3 expression in keratinocytes — aquaporin channels control water transport into skin cells, and higher aquaporin-3 expression increases skin cell water content directly (hydration glow mechanism). Ginsenoside Rg3 inhibits melanin synthesis while simultaneously stimulating keratinocyte differentiation (cell renewal) — producing clearer, more translucent new surface cells (translucency glow mechanism). Ginsenoside Rh2 stimulates ceramide synthesis in keratinocytes, improving the surface lipid film that determines light-reflection quality (lipid glow mechanism). This three-mechanism glow model explains why red ginseng consistently outperforms single-mechanism brightening actives in subjective glow assessments.
BOJ Glow Serum in a K-beauty glass skin protocol
Glass skin — the K-beauty aesthetic ideal of poreless, reflective, luminous skin — is achieved through a protocol that addresses all three glow mechanisms: first-step toner (hydration layer), essence (additional hydration and active priming), glow serum (ginsenoside luminosity stimulation), moisturiser (surface lipid lock-in). The ginseng glow serum sits at the essence-to-serum transition point in this layering sequence — applied after hydrating toner and essence layers have established the deep hydration base, before the moisturiser seals everything in. Morning SPF then protects the achieved glow from the UV-induced oxidative dullness that erases it.
Beauty of Joseon Glow Deep Serum Rice + Alpha Arbutin 30ml — available on BuyBeautyKorea →
