E1520 – Propylene glycol | Solvent, Humectant Uses & Safety

Quick analysis summary about E1520 – Propylene glycol food additive

Bottom line about E1520

E1520 is propylene glycol, also called propane-1,2-diol, a liquid used mainly as a solvent, carrier and humectant for flavours, colours, enzymes, nutrients and some food preparations. At normal food-use levels it is graded GREEN – SAFE, because the main toxicology data support low concern at realistic dietary exposure.[1-5]

Why this grade for E1520

The grade is based on an established ADI, long-term feeding studies in rats and dogs, reproductive and developmental evaluations, and later toxicology reviews. Very high exposure from medicines or unusual non-food sources can affect osmolality, lactate and blood cells, but ordinary food exposure is much lower.[1,3-5]

Who may want to limit or avoid E1520

Most adults do not need to avoid E1520 in normal foods. Infants receiving medicines that contain propylene glycol and people with serious kidney or liver impairment may need more caution because clearance matters more at high doses.[1,5]

Common uses and where E1520 appears

E1520 is most often used as a carrier solvent for flavourings, colours, antioxidants, emulsifiers, enzymes and nutrient preparations. It may also appear in chewing gum, bakery products, sauces, confectionery coatings and beverage flavour systems, depending on local rules.

E1520 source or origin

Commercial propylene glycol is usually synthetic or produced by controlled industrial processing, including routes from propylene oxide or from glycerol. The source can vary by manufacturer, and the source itself does not determine the safety grade.

Intake note for E1520

The ADI (Acceptable Daily Intake) used for propylene glycol is 0-25 mg/kg body weight per day. That equals up to about 1,750 mg per day for a 70 kg adult and about 500 mg per day for a 20 kg child, it is a safety benchmark, not a target intake.[1]

Is E1520 banned anywhere?

E1520 is authorised in the European Union mainly for specified carrier and additive-preparation uses rather than broad direct addition to every food. In the United States, propylene glycol is permitted under the food additive and GRAS framework for specified food uses. No clear major food-use ban was identified in the reviewed jurisdictions, but permitted uses and maximum levels vary by market and food category.

Safety grading GREEN – SAFE

E1520 is graded GREEN – SAFE because normal food-use exposure is far below the dose range associated with the main toxicological effects. The safety case is not based on approval alone: repeated-dose studies, reproductive evaluations and modern reviews are broadly consistent in showing low concern for carcinogenicity, reproductive toxicity and organ toxicity at realistic dietary exposure. The main caveat is that very high systemic exposure can affect osmolality, lactate balance and blood cells, especially outside ordinary food use.[1-5]

Study basis or key toxicological reasoning for E1520

The key oral evidence includes a 2-year rat feeding study in which about 2,500 mg/kg body weight per day did not produce treatment-related organ toxicity or increased neoplasms.[2] A 2-year dog feeding study found no irreversible damage, with only slight blood and bilirubin-related changes at around 5,000 mg/kg body weight per day.[3] Later reviews describe low overall human-health risk, with rare skin reactions and high-dose haematological findings as the main caveats.[1,4] Reproductive and developmental evaluations found negligible concern at current or estimated human exposure levels, although direct human reproductive data are limited.[5] The main uncertainty is that much of the core oral database is older, so the grade relies on consistency across animal studies, toxicokinetics and newer review-level analysis.[1-5]

Side effects of E1520 – Propylene glycol food additive

Usually none at normal food-use levels: small carrier or solvent amounts are not expected to cause symptoms in most people.[1,4]
Digestive discomfort if intake is unusually high: very large oral exposure may cause nausea or gastrointestinal upset.[1,4]
Metabolic effects at high systemic exposure: high-dose medicinal or accidental exposure can increase osmolality and may contribute to lactic acidosis.[1]
Blood-cell effects at high doses in animals: dogs and cats showed species-related blood changes at very high intake.[2-4]
Rare irritation or sensitivity: occasional irritation is reported more in topical, inhaled or pharmaceutical contexts than in foods.[4]

Should You Avoid E1520 – Propylene glycol food additive?

Most people do not need to avoid E1520 when it appears as a minor carrier or solvent in food. A varied diet that does not rely heavily on highly processed foods is enough for ordinary risk management. People with high medical exposure, infants receiving medicines that contain it, or significant kidney or liver disease should treat cumulative exposure more carefully.[1,5]

Common uses of E1520 – Propylene glycol food additive

Carrier solvent for flavourings and flavour concentrates
Carrier for colours, antioxidants and emulsifiers
Humectant helping retain moisture in selected products
Chewing gum and confectionery applications in some markets
Bakery products and fillings where permitted
Sauces, dips and concentrated marinades in some regulatory systems
Nutrient, enzyme and additive preparations

Common names and synonyms of E1520 – Propylene glycol food additive

Propylene glycol
Propane-1,2-diol
1,2-propanediol
1,2-dihydroxypropane
Methyl glycol
E1520
INS 1520

What is E1520 – Propylene glycol food additive?

E1520 propylene glycol is a clear, slightly viscous liquid that mixes readily with water and many flavour or colour ingredients. Its main value in food technology is practical rather than nutritional: it helps dissolve, disperse or carry substances used in small amounts, so consumers may encounter it indirectly through flavourings, colours, additive blends or nutrient preparations.

Chemically, propylene glycol is an alcohol diol. The body can absorb it and metabolise it mainly toward lactate, pyruvate and energy metabolism. At ordinary food-use amounts, these pathways are not expected to be overwhelmed, at very high exposure, metabolism and kidney clearance become more important.[1,4]

Where is E1520 – Propylene glycol food additive allowed (EU vs US)?

In the EU, E1520 is authorised mainly in Annex III-type uses as a carrier or solvent in preparations such as food additives, enzymes, nutrients and flavourings, with conditions depending on the application. In the US, propylene glycol is permitted for specified food uses under the food additive and GRAS framework, with use levels limited by regulation or good manufacturing practice.

E1520 – Propylene glycol