Propylene glycol monoesters (PGME) / monostearate (PGMS)
A food emulsifier made by joining propylene glycol to fatty acids (often from vegetable oils). It helps fats and water mix, improving texture and shelf life.
Should I eat Propylene glycol monoesters (PGME) / monostearate (PGMS)?
E477 (propylene glycol monoesters/monostearate) is a synthetic emulsifier approved by major regulators and considered safe within its ADI, but it offers no nutritional benefit. If you prefer to avoid highly refined additives or certain fat sources (e.g., palm or animal), choose products without E477.
Summary
E477 helps fat and water mix so foods hold their texture; it is made from propylene glycol and fatty acids from edible oils. EFSA and JECFA have evaluated it and set an ADI of 0–25 mg/kg/day (as propylene glycol), and Codex sets category‑specific maximum use levels. It is a processed additive and does not contribute nutrients. Most people can consume it safely at regulated levels, though those limiting emulsifiers or avoiding palm/animal‑derived inputs may prefer alternatives. Check labels if you want to minimize additive exposure across many processed foods.
Key Research Points
Safety reviewed; ADI set at 25 mg/kg
EFSA reconfirmed an acceptable daily intake of 0–25 mg per kg body weight per day for E477 (expressed as propylene glycol), indicating it is safe at regulated levels.
Low use levels and category caps
International standards set maximum levels by food category (e.g., up to 1.5% in some bakery wares), and manufacturers typically use much less, which limits intake.
Highly refined, synthetic emulsifier
PGME/PGMS is made by esterifying propylene glycol with fatty acids from edible oils and then purified (e.g., by molecular distillation) under JECFA specifications—so it is a processed additive, not a nutrient.
Overview
What is it?
Why is it used?
Origin
Propylene glycol esters of fatty acids were developed as modern emulsifiers as industrial baking scaled in the 1900s. They’re made by reacting propylene glycol (a widely used food solvent) with fatty acids from edible oils. In Europe they’re labeled as E477 and have been evaluated by JECFA and EFSA; in the U.S. they’re permitted by FDA under 21 CFR 172.856.
Process: Esterify or transesterify fatty acids with propylene glycol, then refine
Steps
Chemicals
Research & Safety
Potential Concerns
The main health guardrail is the ADI (0–25 mg/kg/day as propylene glycol). Codex category caps and the “use only as needed” rule help keep intake within that range, but cumulative exposure from many processed foods can add up, so label reading can help if you want to limit additives. E477 is a synthetic, highly refined emulsifier, which some consumers prefer to avoid. It may be sourced from palm/soy or animal fats, which can be relevant for personal ethics or dietary patterns.
Potential Benefits
No demonstrated nutritional benefit. E477’s role is functional: it helps fat and water stay mixed and supports consistent texture in foods like bakery items, toppings, and frozen desserts. It is used at low levels and does not provide protein, fiber, vitamins, or minerals. There is no evidence it improves health outcomes directly.
Digestive Effects
At typical food levels, regulators have not identified digestive harms for E477 within the ADI. Because it is an emulsifier (not fiber or a sweetener), it is not expected to affect blood sugar or act as a prebiotic. Some people choose to minimize emulsifiers in general; if you notice GI discomfort with certain processed foods, consider tracking your response and reducing intake. For most people, occasional consumption at regulated levels is unlikely to cause digestive issues.
Limit Consumption
EFSA and JECFA did not flag specific vulnerable populations for E477 when used within the ADI. It is not a major allergen, but the fatty‑acid source can be plant or animal, which matters for vegans, vegetarians, and some religious diets. Parents often prefer fewer nonessential additives in foods for very young children; choosing simpler ingredient lists can help. If you avoid palm‑derived inputs for environmental reasons, check with manufacturers or choose products that specify alternative sources.
Fact Sheet
Regulatory Status
ESG & Sustainability
Allergens and Diet
Natural Alternatives
Egg yolk (emulsifier)
Sunflower lecithin
Mono- and diglycerides
Citations
21 CFR 172.856 — Propylene glycol mono- and diesters of fats and fatty acids
2025-09-18U.S. FDA • eCFR (FDA)
Re-evaluation of propane-1,2-diol esters of fatty acids (E 477) as a food additive
2018-12-06EFSA FAF Panel • EFSA Journal
Propylene glycol esters of fatty acids (INS 477) — Specification
2000-01-01FAO/WHO JECFA • JECFA (FAO/WHO)
GSFA Online: Propylene glycol esters of fatty acids (INS 477)
2025-01-01FAO/WHO Codex • Codex GSFA
Class names and INS numbers (E477 listing)
2025-07-10Codex Alimentarius • Codex
PROPYLENE GLYCOL MONO- AND DIESTERS OF FATS AND FATTY ACIDS (inventory entry)
2025-01-01U.S. FDA • FDA (Substances Added to Food)
Propylene Glycol Monostearate — Uses in Foods
2023-10-18CNCHEMSINO • Industry technical article