Propylene glycol monostearate (PGMS)
A food emulsifier made by attaching stearic acid (a fatty acid from oils) to propylene glycol; helps keep fat and water mixed, adds aeration, and slows staling in baked and whipped products.
Should I eat Propylene glycol monostearate (PGMS)?
PGMS is a synthetic emulsifier used in tiny amounts to improve texture and foam stability; it offers no nutritional benefit. It is considered safe at typical intakes for most people, but it is generally not used in infant formula and may be avoided if you prefer fewer synthetic additives.
Summary
Propylene glycol monostearate (E477) helps keep fats and water mixed and stabilizes foams in cakes, toppings, and creamers. Major authorities have confirmed an ADI of 0–25 mg/kg body weight per day (as propylene glycol), and estimated consumer intakes are below this threshold. The ingredient does not contribute nutrients; its effects are about product texture and shelf softness. Very high intakes of the propylene glycol part can upset the stomach, but permitted food uses are far lower. If you want to minimize synthetic or highly processed additives, look for products using alternatives like lecithin or monoglycerides.
Key Research Points
Safety limit set; typical intakes are low
Regulators set a group acceptable daily intake (ADI) of 0–25 mg/kg body weight per day, expressed as propylene glycol, for E477; estimated population intakes did not exceed this level.
Very high doses may upset the gut
The propylene glycol portion of E477 can cause gastrointestinal discomfort at high intakes; food uses are far below such levels for most people.
Highly processed, synthetic additive
PGMS is made by chemically esterifying propylene glycol with fatty acids at high heat using catalysts, then neutralized and refined—this affects label simplicity more than safety at permitted uses.
Overview
What is it?
Why is it used?
Origin
PGMS emerged as part of the post-WWII wave of fat-based emulsifiers developed for industrial baking. By the 1960s–70s, propylene glycol esters (E477) were standard in American cake mixes and whipped toppings to increase volume and stabilize foam. Today PGMS is typically made from plant-derived stearic acid (palm, soy, or other vegetable oils) reacted with propylene glycol, and is regulated globally as E477.
Process: Catalytic esterification then neutralize & purify
Steps
Chemicals
Research & Safety
Potential Concerns
For most people, permitted uses are considered safe by major authorities, with intakes below the established ADI. The main practical risk is gastrointestinal discomfort if total propylene glycol exposure were to become very high, which is uncommon from food alone. Infant products have tighter rules; E477 is generally not used in infant formula, so avoid assuming adult safety limits apply to infants. PGMS is a highly refined, synthetic emulsifier; if you prefer fewer synthetic additives, choose products that use alternatives such as lecithin.
Potential Benefits
No demonstrated nutrimental benefit. PGMS is used to create a smoother, more uniform texture by keeping fats and water mixed and by stabilizing foams. In baked goods it can help keep the crumb softer for longer, which changes eating quality, not nutrition. Any “benefit” to you is about texture and consistency rather than health.
Digestive Effects
At very high intakes, the propylene glycol portion can cause loose stools or stomach upset. Typical amounts used in foods are tiny and well below levels expected to cause symptoms. People who react to multiple processed products in one sitting may find that overall additive exposure contributes to discomfort; spreading intake out may help. If you notice recurring GI symptoms after products listing E477, consider limiting those items and observe whether symptoms improve.
Limit Consumption
Infants and very young children have stricter additive rules; E477 is generally not used in infant formula, so parents should avoid relying on adult safety limits for infant feeding. Individuals specifically trying to avoid synthetic or highly processed additives may wish to choose alternatives without E477. Vegans who want to ensure plant-only sourcing should check labels or manufacturer information, as stearic acid can be plant- or animal-derived. No major allergen status is associated with PGMS, but always consider overall dietary pattern and cumulative exposure to additives.
Fact Sheet
Regulatory Status
ESG & Sustainability
Allergens and Diet
Natural Alternatives
Egg yolk
Sunflower lecithin
Monoglycerides (GMS)
Citations
Re-evaluation of propane-1,2-diol esters of fatty acids (E 477) as a food additive
2018-12-06EFSA ANS Panel • EFSA Journal
JECFA Specifications: Propylene glycol esters of fatty acids (INS 477)
2000-01-01JECFA • FAO/WHO JECFA
Propylene glycol esters of fatty acids (E477) ADI entry
2023-01-01WHO • WHO JECFA Database
21 CFR §172.856 Propylene glycol mono- and diesters of fats and fatty acids
2024-01-01FDA • eCFR
Propylene glycol esters of fatty acids (INS 477)
2023-01-01FAO Codex • Codex GSFA
Propylene Glycol Monoesters | Baking Ingredients
2017-01-01Bakerpedia Editorial • Bakerpedia
Anti-staling composition and bakery products… (AU2005220011B2)
2005-06-30Unilever NV • Google Patents
Methods for the preparation of propylene glycol fatty acid esters (US 6,723,863)
2004-04-20US Patent • Google Patents
Substances Added to Food: Propylene glycol stearate / monostearate
2024-06-21FDA • FDA CFSAN