The ingredient, explained
Mannan
Research examined MANNAN under the stated study conditions.
Ingredient guide
What it is and what it does
D-Mannosan
About this ingredient: EU CosIng ingredient registry (via Open Beauty Facts taxonomy) ↗
- Film forming
- Leaves a continuous layer on skin, hair or nails after application.
Function definitions: European Commission ingredient function definitions (SCCNFP/0299/00, pages 16 to 20) ↗
Registry functions describe possible formulation roles, not results for a finished product. A dictionary entry is not an approval or a safety assessment.
A closer look
What the research shows
Human oral research
Oral yeast mannan improved reported skin dryness and altered selected intestinal microbiota measures compared with placebo.
What this does not tell us
A yeast-derived mannan preparation, not all mannan polymers or topical formulas. Skin dryness was subjective; microbiome findings are not direct cosmetic efficacy.
Sources for this summary. PubMed 33260560 ↗
Research review checked Oct 1, 2026
Read exact local candidate abstracts first; select identity-relevant papers; targeted primary PubMed/publisher searches. This is not an exhaustive systematic review.
Ingredient research is not proof that a product containing this ingredient works.
Read the 1 selected study
Human oral research · n=110
Effects of Yeast Mannan Which Promotes Beneficial Bacteroides on the Intestinal Environment and Skin Condition: A Randomized, Double-Blind, Placebo-Controlled Study. ↗
Nutrients · 2020
Follow the formula
Products containing this ingredient
From the wider catalogue. Linked by the ingredient list, without an efficacy ranking.
Names and identifiers
Registry identity
D-Mannosan
- INCI name on ingredient lists
- MANNAN
- CAS registry number
- 9036-88-8, 51395-96-1
Sources for this ingredient record
- EU CosIng ingredient registry (via Open Beauty Facts taxonomy) ↗ · ODbL 1.0 (Open Beauty Facts database) · Recorded Aug 8, 2026