Gluconolactone
Also known as: GDL, glucono delta-lactone, polyhydroxy acid, PHA, D-glucono-1,5-lactone
Effective Dosage
No established dose for oral use; topical concentrations of 5–14% used in studies
What the Science Says
Gluconolactone is a polyhydroxy acid (PHA) — a gentler cousin of alpha-hydroxy acids like glycolic acid — found naturally in honey and fruit. Applied to skin, it exfoliates dead cells, boosts moisture, and strengthens the skin's protective barrier. Clinical studies show it reduces acne lesions comparably to benzoyl peroxide, calms redness in rosacea, and delivers anti-aging benefits similar to glycolic acid, all while causing significantly less stinging and irritation.
What It Doesn't Do
No evidence it works as an oral supplement for skin or any other health benefit. Not proven to outperform standard acne treatments like benzoyl peroxide — it just causes fewer side effects. Won't replace prescription treatments for moderate-to-severe acne or rosacea. No proven cognitive, weight loss, or systemic health benefits in humans. Animal data suggesting neurobehavioral effects at high oral doses has not been replicated in humans.
Evidence-Based Benefits
Gluconolactone is a polyhydroxy acid (PHA) — a gentler cousin of alpha-hydroxy acids like glycolic acid — found naturally in honey and fruit. Applied to skin, it exfoliates dead cells, boosts moisture, and strengthens the skin's protective barrier. Clinical studies show it reduces acne lesions comparably to benzoyl peroxide, calms redness in rosacea, and delivers anti-aging benefits similar to glycolic acid, all while causing significantly less stinging and irritation.
Moderate EvidenceEffective at: No established dose for oral use; topical concentrations of 5–14% used in studies
Source: auto-research
Absorption & Bioavailability
Unknown for oral use. Topical absorption is not characterized in the provided studies; it functions primarily at the skin surface level.
Red Flags to Watch For
- Animal study found neurobehavioral changes and altered neurotransmitter levels at high oral doses — oral safety in humans is not established from the provided data
- When used as a preservative blend (gluconolactone + sodium benzoate), it may affect collagen production in skin fibroblasts at certain concentrations
- Most evidence is topical only — products marketing oral gluconolactone for skin or systemic benefits lack clinical support
- IPL (light therapy) outperformed topical gluconolactone serum for overall rosacea improvement — it is not a replacement for medical procedures in moderate-to-severe cases
Products Containing Gluconolactone
See how Gluconolactone 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