Farnesol
Farnesol is listed under FEMA GRAS and 21 CFR 172.515 as an approved synthetic flavoring substance used in minimum quantity required for effect. It is also listed by the EU as a fragrance allergen requiring labeling above thresholds in cosmetics.
What it is
A natural sesquiterpene alcohol present in many essential oils (e.g., neroli, rose); used as a flavoring and fragrance.
Floral/citrus flavoring substance in trace amounts.
Why it's flagged
- Skin sensitizer (cosmetic context)
- Limited intake data at high levels
What regulators actually say
"21 CFR 172.515 lists synthetic flavoring substances and adjuvants that may be safely used in food, including farnesol, used in the minimum quantity required to produce their intended effects."
Regulatory status
United States — FDA
Listed under 21 CFR 172.515 as synthetic flavoring substance.
European Union — EFSA
Permitted flavoring substance (FL no. 02.040).
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