Jihwang (Rehmannia Root): effective % & pH 지황
⏱ 1 min read
⚡ Quick answer: Jihwang (Rehmannia Root): effective concentration not standardised — usually a small percentage of a hanbang blend, optimal pH 4.0–7.0, evidence Limited. The hydration part is credible. The rest is tradition, and tradition is worth something — just not the same thing as evidence.
How much Jihwang (Rehmannia Root) actually works? Here's the dosage, pH and evidence — the formulator-level read behind the % on a Korean label.
| Effective % | not standardised — usually a small percentage of a hanbang blend |
|---|---|
| Optimal pH | 4.0–7.0 |
| Evidence | Limited |
| Onset | immediate (feel) for hydration |
What the % on the label really means
The hydration part is credible. The rest is tradition, and tradition is worth something — just not the same thing as evidence.
⚠️ Ceiling: Its polysaccharides thicken a formula before they do anything else, which caps practical use levels.
Jihwang (Rehmannia Root) guide →How Jihwang (Rehmannia Root) works →
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✍️ Written & reviewed by the KoreaPlus Editorial team — dermatologist-informed, cosmetic-science researched & source-cited. Last reviewed: 2026-08-23.
General educational information using cosmetic structure-function wording — not medical advice. Always patch-test new actives. © KoreaPlus.