Sodium Nitrate vs Propyl Gallate: which is worse?

What is Sodium Nitrate?

Sodium nitrate (NaNO3) is a naturally occurring salt found in soil and some plants, and also synthetically produced for use as a food preservative and curing agent. It is converted to sodium nitrite by bacterial action in foods or in the body, where it exerts its preservative and curing effects. Sometimes called 'Chile saltpeter' after its natural South American ore source.

What is Propyl Gallate?

Propyl gallate is a synthetic antioxidant preservative derived from gallic acid and propanol. It prevents oxidation of fats and oils, extending shelf life of fat-containing foods. It is often used in combination with BHA and BHT for synergistic antioxidant effect. Chemical formula: C10H12O5.

Documented risks

Sodium Nitrate: Sodium nitrate shares the same health concerns as sodium nitrite: conversion to nitrosamines is the primary mechanism of concern. Sodium nitrate is converted to nitrite by bacterial reduction in foods and by nitrate-reducing bacteria in saliva before reaching the stomach. The subsequent conversion of nitrite to nitrosamines carries the same carcinogenicity concerns described for sodium nitrite. IARC's 2015 classification of processed meat as Group 1 human carcinogen applies to all nitrite/nitrate-cured processed meats. EFSA's 2017 re-evaluation established acceptable daily intakes (ADIs) for nitrate (3.7 mg/kg body weight/day) and nitrite (0.07 mg/kg body weight/day) based on risk assessment. A notable paradox in nitrate nutrition: dietary nitrate from vegetables (particularly leafy greens like spinach, arugula, and lettuce, and root vegetables like beets) is associated with cardioprotective effects through the nitrate-nitrite-NO pathway, where nitric oxide from dietary nitrate improves vascular function and reduces blood pressure. This beneficial effect of vegetable nitrate contrasts with the potential harm from processed meat nitrate/nitrite, suggesting that the food matrix and associated compounds (antioxidants in vegetables vs. amines in meat protein) significantly influence whether nitrite produces beneficial or harmful effects. Infant exposure to high nitrate levels — particularly from well water — can cause methemoglobinemia ('blue baby syndrome'). The EU and WHO set strict nitrate limits for infant water and food for this reason.

Propyl Gallate: Animal studies have shown propyl gallate may cause liver damage at high doses. Concerns about estrogenic activity have been raised — some studies suggest propyl gallate may weakly mimic estrogen. Contact dermatitis and allergic reactions are documented in both food and cosmetic applications. Japan banned propyl gallate for food use as part of its precautionary approach to synthetic food preservatives. NTP bioassays found dose-dependent liver effects. EFSA's re-evaluation set an ADI of 0.1 mg/kg body weight — one of the lowest ADIs for food additives, reflecting toxicological concern.