Phenoxyethanol
Also known as: 2-phenoxyethanol, 2-PE, PEtOH, ethylene glycol monophenyl ether
Effective Dosage
No established dose as a supplement; used as a preservative at 0.5–5 mg per vaccine dose or up to ~1% in cosmetics
What the Science Says
Phenoxyethanol is a synthetic chemical preservative widely used in vaccines, cosmetics, tattoo inks, and pharmaceuticals to prevent microbial contamination. Research shows it works by disrupting bacterial cell membranes and inducing oxidative stress in both gram-positive and gram-negative bacteria. It is absorbed through the skin and excreted in urine as phenoxyacetic acid, and it has been safely used in over 30 vaccine formulations at doses up to 5–10 mg per dose with no systemic toxicity observed in clinical trials.
What It Doesn't Do
Not a health supplement—it has no proven benefit when consumed or applied intentionally for wellness. Won't boost immunity, reduce inflammation, or improve any health outcome on its own. Not a nutrient your body needs. Don't confuse its role as a preservative with any therapeutic effect.
Evidence-Based Benefits
Phenoxyethanol is a synthetic chemical preservative widely used in vaccines, cosmetics, tattoo inks, and pharmaceuticals to prevent microbial contamination. Research shows it works by disrupting bacterial cell membranes and inducing oxidative stress in both gram-positive and gram-negative bacteria. It is absorbed through the skin and excreted in urine as phenoxyacetic acid, and it has been safely used in over 30 vaccine formulations at doses up to 5–10 mg per dose with no systemic toxicity observed in clinical trials.
Weak EvidenceEffective at: No established dose as a supplement; used as a preservative at 0.5–5 mg per vaccine dose or up to ~1% in cosmetics
Source: auto-research
Absorption & Bioavailability
Moderate — absorbed through skin and mucous membranes; detected in blood and urine after tattooing and dermal exposure. Skin site (e.g., hands vs. other areas) affects absorption rate. Metabolized to phenoxyacetic acid and excreted in urine.
Red Flags to Watch For
- Phenoxyacetic acid (its main metabolite) has been associated in observational research with reproductive concerns including longer time to conception and potential endocrine disruption in newborns — a clinical trial is underway to investigate this in pregnant women
- Applying facial sheet masks for longer than 20 minutes significantly increases skin exposure to phenoxyethanol — stay within recommended application times
- Used as a fish anesthetic in aquaculture — residues in seafood products raise unresolved food safety questions
- Not intended for use as a dietary supplement; its presence in a supplement product is a red flag, not a feature
- Skin absorption varies significantly by body site, meaning occupational or repeated cosmetic exposure may lead to higher systemic levels than expected
Products Containing Phenoxyethanol
See how Phenoxyethanol is used in these analyzed products:
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-09