Hyaluronic acid on your skin: a safety profile

What is hyaluronic acid?

The IUPAC name is 2-acetamido-2-deoxy-β-D-glucopyranosyl-(1→3)-β-D-glucopyranuronic acid.

Also known as: 2-acetamido-2-deoxy-β-D-glucopyranosyl-(1→3)-β-D-glucopyranuronic acid, hyaluronate, HA, high molecular weight biopolymer.

IUPAC name

2-acetamido-2-deoxy-β-D-glucopyranosyl-(1→3)-β-D-glucopyranuronic acid

CAS number

9004-61-9

Molecular formula

C20H32NO17

Molecular weight

460.4 g/mol

SMILES

CCC(CC)C1=CC(=NC2=C(C(=NN12)C)C3=C(N=C(S3)C4=NC=NN4C)Br)C

PubChem CID

24898976

Regulatory consensus

2 regulatory and scientific bodies have classified Hyaluronic acid. The classifications differ — that's the data.

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 hyaluronic acid

• skincare products
• anti-aging formulations
• dietary supplements
• dermatological products

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Hyaluronic acid:

• Glycerin (plant-derived) — gold standard humectant, excellent safety profile
  Trade-offs: Consumer preference for 'natural' label; many natural fragrance compounds are potent allergens (limonene, linalool, eugenol); 'natural' ≠ 'safe'; often more expensive than synthetic equivalents.
  Relative cost: 2-5× conventional
• Panthenol (provitamin B5) — well-tolerated, additional skin-soothing properties
  Trade-offs: Removes 95-99% of dissolved contaminants including metals, PFAS, nitrates; wastes 2-4 gallons per gallon produced (improving with newer systems); removes beneficial minerals; $0.05-0.25/gallon; requires pre-treatment for longevity.
  Relative cost: 1.2-2×

Frequently asked questions