1,5-PENTANEDIOL

📋 Quick facts

Description: 1,5-PENTANEDIOL — SOLVENT.

All Functions: SOLVENT

Quick Facts:

• Category: other

Proven Benefits At A Glance:

• 1,5-pentanediol (PD) is a chemical used in cosmetics, polymers, and pharmaceuticals
• In a clinical trial, PD gel showed no prophylactic benefit—it didn’t prevent herpes outbreaks when used preventively
• When herpes lesions did occur, PD gel significantly improved symptoms like blistering, swelling, and pain compared to placebo
• No side effects were observed in the herpes study

⚗️ Chemical Overview

Pentane-1,5-diol is a primary alcohol.

Source(s): ChEBI, via PubChem

📊 Comedogenicity

🛡️ Safety rating

Safety tier is a starting heuristic from regulatory status and comedogenic rating, not a dermatological verdict — see our Terms for the full disclaimer. Research confidence reflects how many real cited studies back this ingredient, not the strength of their findings.

🌍 Regulatory Status

💧 Skin Type Compatibility

⚠️ Don’t Combine With

📚 Research & Evidence

🔬 The Science

1,5-pentanediol is a small organic molecule—specifically a diol, meaning it has two hydroxyl groups (–OH) attached to a five-carbon chain—that has attracted interest across multiple industries (Microb Cell Fact, 2026). In skincare specifically, the ingredient was studied for its potential to manage recurrent herpes labialis (cold sores caused by the herpes simplex virus). A double-blind, placebo-controlled trial published in Advances in Therapy (2009) examined whether 1,5-pentanediol gel could both prevent and treat cold sores. Over 26 weeks, 105 patients applied either PD gel or placebo twice daily as a preventive measure. The results were mixed: #1: PD showed no significant prophylactic effect—meaning it did not reduce how often herpes episodes recurred (Adv Ther, 2009).

However, #2: when patients did experience an outbreak and used PD gel intensively (eight times daily for five days), they experienced statistically significant improvement in three specific symptoms: blistering, swelling, and pain compared to those using placebo (Adv Ther, 2009). #3: The ingredient was rated as very safe, with no adverse effects reported during the study period (Adv Ther, 2009). It’s worth noting that the available research on 1,5-pentanediol for skincare is limited to this single herpes labialis trial. The other source focuses on industrial production methods rather than consumer benefits. If you’re considering this ingredient, the evidence supports it as a safe option for symptom relief during active cold sore episodes, but not as a preventive treatment.

📄 Related Research

Matched by search — not necessarily verified support for every statement above.

• Deng H et al. (2026). Combining computer-aided enzyme design and chromosomal integration for plasmid-free biosynthesis of 1,5-pentanediol in Escherichia coli. Microb Cell Fact.
• Busch R et al. (2009). Therapeutic effect of 1,5-pentanediol for herpes simplex labialis: a randomized, double-blind, placebo-controlled clinical trial. Adv Ther.

🧴 Products Containing 1,5-PENTANEDIOL