Body & Beauty / Compounds / Nanocellulose (cellulose nanocrystals and nanofibrils)

Nanocellulose (cellulose nanocrystals and nanofibrils) on your skin: a safety profile

Low risk

(People-specific data is limited; this page draws from human adult context.) Derived from wood pulp, cotton, or bacteria. Biodegradable and generally recognized as biocompatible. No genotoxicity or cytotoxicity at relevant doses in multiple studies. Emerging food additive (thickener, emulsion stabilizer) and packaging material. Long fiber forms may cause mild pulmonary inflammation at very high inhalation doses.

What is nanocellulose (cellulose nanocrystals and nanofibrils)?

The IUPAC name is 2-[4,5-dihydroxy-2-(hydroxymethyl)-6-methoxyoxan-3-yl]oxy-6-(hydroxymethyl)-5-methoxyoxane-3,4-diol.

Also known as: 2-[4,5-dihydroxy-2-(hydroxymethyl)-6-methoxyoxan-3-yl]oxy-6-(hydroxymethyl)-5-methoxyoxane-3,4-diol, SCHEMBL825024, CHEBI:167997, (2R,3R,4R,5R,6R)-5-{[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-methoxyoxan-2-yl]oxy}-6-(hydroxymethyl)-2-methoxyoxane-3,4-diol.

IUPAC name: 2-[4,5-dihydroxy-2-(hydroxymethyl)-6-methoxyoxan-3-yl]oxy-6-(hydroxymethyl)-5-methoxyoxane-3,4-diol
CAS number: 9004-34-6
Molecular formula: C14H26O11
Molecular weight: 370.35 g/mol
SMILES: COC1C(OC(C(C1O)O)OC2C(OC(C(C2O)O)OC)CO)CO
PubChem CID: 14055602

Risk for people

Low risk

Derived from wood pulp, cotton, or bacteria. Biodegradable and generally recognized as biocompatible. No genotoxicity or cytotoxicity at relevant doses in multiple studies. Emerging food additive (thickener, emulsion stabilizer) and packaging material. Long fiber forms may cause mild pulmonary inflammation at very high inhalation doses.

Regulatory consensus

3 regulatory and scientific bodies have classified Nanocellulose (cellulose nanocrystals and nanofibrils). The classifications differ — that's the data.

Agency	Year	Classification
FDA	2023	Cellulose is GRAS (21 CFR 182.1); nano form under case-by-case evaluation via FCN
EU	2023	Novel food ingredient — requires EFSA safety assessment per (EU) 2015/2283
Canada	2024	On Domestic Substances List; nano form under Chemicals Management Plan assessment

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where you encounter nanocellulose (cellulose nanocrystals and nanofibrils)

Food Additive
Food Packaging
Cosmetics
Medical

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Nanocellulose (cellulose nanocrystals and nanofibrils):

Microcrystalline cellulose (MCC)
Trade-offs: Lower mechanical reinforcement. Well-characterized toxicology (decades of use in pharma).

Relative cost: 0.1× nanocellulose
Micro-fibrillated cellulose (MFC)
Trade-offs: Larger fiber size → lower transparency. Less surface area for functionalization.

Relative cost: 0.3-0.5×

Frequently asked questions

Why do regulators disagree about nanocellulose (cellulose nanocrystals and nanofibrils)?

Nanocellulose (cellulose nanocrystals and nanofibrils) has been classified by 3 agencies including FDA, EU, Canada, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.

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Look up products containing nanocellulose (cellulose nanocrystals and nanofibrils), compare to alternatives, and explore the full data record.

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Sources (1)

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →