E-numbers / Other additives / E541
also: Sodium aluminium phosphate, acidic · SALP · Sodium aluminum phosphate
A leavening acid made from aluminium, sodium and phosphate, used to help baked goods rise. Adds aluminium to the diet.
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Durum Wheat Macaroni (80%), Whey Powder (from Milk), Cheese (from Milk) Powder (5%), Potato Starch, Lactose (from Milk), Salt, Yeast Extract, Colours (Paprika Extract, Beta Carotene), Stabiliser (E541), Pepper, Vegetable Oil
Aluminium accumulates in the body and brain.
5
of the 43,325 UK supermarket foods we checked declare E541 in their ingredients
That is under 0.1%, counted by its code or its name.
Counted by NutraSafe from UK supermarket ingredient lists, September 2026. How we counted
Why it’s worth knowing. Aluminium accumulates in the body and brain. At high exposures in animal studies it causes nerve damage. Regulators have set a weekly limit because cumulative aluminium from food, water and additives combined can exceed it in some diets.
Sodium aluminium phosphate (SALP) is an inorganic salt combining sodium, aluminium and phosphate ions. The acidic form (the only variant permitted as a food additive) is a white powder that acts as an acid component in leavening systems. It is the additive component of double-acting baking powder that releases gas slowly during baking heat.
In baked goods, SALP reacts with sodium bicarbonate (baking soda) when heat is applied, releasing carbon dioxide gas. This gas expands the batter or dough, giving the product a light, open crumb. The 'double-acting' property means one burst of gas occurs on mixing and a second, larger burst occurs in the oven, giving consistent rise. It also functions as an emulsifying salt in processed cheese, helping proteins bind with fat and water.
Self-raising flour, commercial cake mixes, pancake mixes, muffins, cornbread, biscuits, and some processed cheese products. On the label it appears as 'sodium aluminium phosphate', 'E541', or within the term 'raising agents (E541, E500)'.
Aluminium is not an essential nutrient. It is absorbed from food in small amounts and cleared mainly by the kidneys, but some accumulates over time in bone, liver and brain tissue. In animal studies, high-dose aluminium exposure causes nerve damage, impairs learning and memory, and produces changes in brain chemistry. The relevance of these animal findings to the much lower exposures from food additives in humans is debated, but regulators have not been able to rule out a concern at the population level.
EFSA established a tolerable weekly intake (TWI) of 1 mg aluminium per kg body weight, based on animal studies showing adverse neurological and reproductive effects at higher doses.
EFSA's 2018 re-evaluation of E541 concluded that exposure to aluminium from E541 at authorised maximum levels, when combined with aluminium from other dietary sources, could lead to exceedance of the TWI for some population groups including children.
Animal studies show aluminium accumulates in the brain and causes changes in neurotransmitter systems, motor function and behaviour at sustained high exposures. These effects underpin the TWI calculation.
E541 is not the only aluminium source in food. Aluminium sulphates (E520-523), sodium aluminium silicate (E554), and naturally occurring aluminium in grains, vegetables and tea all contribute to total intake. EFSA found that average dietary aluminium exposure across EU populations can approach or exceed the TWI, particularly in children who eat proportionally more baked goods relative to their body weight.
Average dietary aluminium exposure for adults was estimated at 0.2-1.5 mg/kg body weight per week across EU Member States, with the upper end reaching or exceeding the 1 mg/kg bw/week TWI.
Children's exposure is proportionally higher than adults' due to higher food intake relative to body weight, meaning some children regularly exceed the TWI when all aluminium sources are combined.
SALP also contributes phosphate to the diet. Phosphate is an essential mineral, but habitually high phosphate intake, particularly from food additives across processed foods, has been associated in observational studies with adverse cardiovascular and kidney outcomes. This is a separate concern from the aluminium component.
High phosphate intake from food additives has been associated with increased cardiovascular mortality in observational studies of people with kidney disease, and raised concerns about vascular calcification in the general population.
People whose diets are already high in aluminium from multiple additive sources (E520-523, E554 in other processed foods) may push total weekly aluminium above the tolerable limit. Children who eat large amounts of commercial baked goods are the group most likely to exceed the limit. Look for 'sodium aluminium phosphate', 'E541', or 'raising agents' on labels of cakes, muffins and biscuits.
The concern with E541 is not the additive in isolation but the cumulative aluminium load from the entire diet. EFSA's position since 2008 is that some population groups, especially children, can exceed the tolerable weekly intake when all aluminium-containing food additives are combined. The panel did not find proof of harm at realistic food intakes, but it could not dismiss the concern either, because the animal-based evidence for neurological effects at higher doses is robust. The science is not contested in the way of some additive debates: regulators broadly agree that total dietary aluminium warrants monitoring, that the TWI is set at a level with a reasonable safety margin, and that reducing intake from avoidable additive sources is prudent. The uncertainty lies in how much the low-level chronic human exposure from food contributes to any long-term risk.
No. E541 is authorised in the UK and EU but only in a restricted list of food categories, primarily fine bakery wares and processed cheese. It is not a general-purpose additive.
Animal studies show that aluminium can damage nerves and impair brain function at sustained high doses. Regulators set a tolerable weekly intake based on those findings, with a safety buffer, because aluminium accumulates slowly in the body and is not an essential nutrient.
Commercial cakes, muffins, pancake mixes, self-raising flour blends and some processed cheeses. It is less common in UK products than in North American baked goods, where SALP is a standard ingredient in double-acting baking powder.
Yes. Sodium aluminium phosphate is a synthetic inorganic salt with no animal-derived ingredients.
Last reviewed: 20 June 2026
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