Sodium Aluminium Phosphate, Acidic

About

What it is and where it shows up.

Sodium aluminium phosphate (acidic) is an inorganic salt used primarily as a leavening agent and acidulant in baked goods such as cakes, muffins, and biscuits, where it reacts with sodium bicarbonate to produce carbon dioxide and achieve rise. It is also used as an emulsifying salt in processed cheese.

Safety summary

The regulatory and scientific consensus.

EFSA concluded E541 is of no safety concern at currently authorised use levels, as exposure from food additives is estimated to be near zero. Aluminium compounds have low bioavailability and low acute toxicity, and there is no concern with respect to genotoxicity or carcinogenicity. However, aluminium carries a recognised neurotoxicity concern, particularly for the developing nervous system, and a group TWI of 1 mg Al/kg bw per week applies across all aluminium-containing food additives combined.

Regulatory landscape

What food-safety regulators have decided.

Jurisdiction	Status	Note
EFSA (European Food Safety Authority) (European Union)	Approved	Authorised under Annex II to Regulation (EC) No 1333/2008 in a few specific food categories only (e.g. flour-based confectionery, fine bakery wares, processed cheese). Purity criteria defined in Commission Regulation (EU) No 231/2012. A group TWI of 1 mg Al/kg bw/week applies to all aluminium-containing food additives combined (EFSA 2008/2018). Re-evaluated in 2018; no safety concern at current authorised uses and use levels.source
FDA (Food and Drug Administration) (United States)	Approved	Listed in FDA Substances Added to Food inventory (formerly EAFUS) as sodium aluminum phosphate, acidic or basic. Permitted as a direct food additive (leavening agent) under 21 CFR 182.1781 (GRAS). No numerical ADI established.source

Who should approach with care

Whose guidance would steer them away.

Children — EFSA data show the highest aluminium exposure from these additives occurs in toddlers and children (up to 0.88 mg Al/kg bw/day at the 95th percentile), and the NOAEL for the developing nervous system is as low as 10 mg Al/kg bw/day, leaving a narrower safety margin compared to adults.

Infants — The developing nervous system is the most sensitive target of aluminium toxicity, and infants have a lower tolerable intake threshold; cumulative aluminium exposure from all dietary sources should be minimised.

Kidney Disease — Impaired renal function reduces aluminium excretion, potentially leading to accumulation; patients with chronic kidney disease should limit intake of aluminium-containing food additives.

Pregnancy — Aluminium can cross the placental barrier; the EFSA NOAEL for developmental neurotoxicity was 10–42 mg Al/kg bw/day in animal studies, supporting precautionary avoidance of unnecessary aluminium intake during pregnancy.

Research citations

The sources behind this verdict.

1FDA. Substances Added to Food (formerly EAFUS) – Sodium Aluminum Phosphate, Acidic or Basic. hfpappexternal.fda.gov
2WHO/JECFA. JECFA / FAO GSFA Online – Sodium aluminium phosphate, acidic (541(i)). fao.org
3EFSA. Re-evaluation of aluminium sulphates (E 520–523) and sodium aluminium phosphate (E 541) as food additives, 2018. efsa.europa.eu
4PubMed. Re-evaluation of aluminium sulphates (E 520-523) and sodium aluminium phosphate (E 541) as food additives, 2018. pubmed.ncbi.nlm.nih.gov
5PubMed (PMC full text). Re-evaluation of aluminium sulphates (E 520–523) and sodium aluminium phosphate (E 541) as food additives, 2018. pmc.ncbi.nlm.nih.gov

Independently researched5 citations