Sodium Aluminum Phosphate (SALP)
Last reviewed October 18, 2026 · Evidence strength: Limited · How we grade evidence
In plain words: Some baking powders, pancake mixes and processed cheese slices use an aluminum-based additive, and some of that aluminum does get absorbed. Science hasn't shown that it causes Alzheimer's, but Europe has cut back its use sharply, and aluminum-free baking powder is easy to find.
Also listed on labels as: Sodium aluminum phosphate, Sodium aluminium phosphate, SALP, E541, Sodium aluminum sulfate
What is it, and why is it in food?
SALP is a leavening acid that makes baked goods rise, and an emulsifying salt that keeps processed cheese smooth. It's in snack cakes, cake and pancake mixes, muffins, biscuits, frozen pizza dough and cheese slices.
What does the science say?
| The popular claim | "Aluminum in baking powder and processed cheese (SALP) is absorbed and contributes to Alzheimer's disease." (A common claim; none of the five experts we reviewed made it.) |
| Our verdict on that claim | Partly supported |
| Evidence strength | Limited: a human absorption study and regulator action; no evidence for an Alzheimer's link from food. |
| Kinds of studies | Human absorption study, systematic review, EU risk assessments |
- Absorption: In volunteers who ate SALP-leavened pancakes, aluminum in urine roughly doubled, showing some is absorbed.1
- Alzheimer's: A 2025 review of 54 studies of environmental aluminum found mixed results (26 positive, 24 not), mostly about drinking water, soil and jobs, not food additives. Few showed cause and effect.2
- Total intake: EFSA's 2008 opinion set a weekly safe amount for aluminum from all foods (1 mg per kg of body weight) and found some people may exceed it.3
What do regulators say?
- EU limits SALP to one specialty use (Spanish-style sponge cake); EFSA (2018) found exposure from that use near zero.4
- FDA: GRAS.5
Who should be careful?
- People with kidney disease, who clear aluminum poorly.
- Families who bake a lot from mixes or eat processed cheese daily get the most.
How common is it in US foods?
In our check of USDA's Branded Foods database, 8,963 of 438,129 US packaged foods with an ingredient list name sodium aluminum phosphate (about 2.0%, or roughly 1 in 49).6 It shows up most often in: cakes, cupcakes, snack cakes (2,367); cake, cookie & cupcake mixes (956); croissants, sweet rolls, muffins & other pastries (916); pizza (756); crusts & dough (509). These are label records companies sent to USDA, mostly in 2021 to 2023, so some products have changed since. Counts come from a text match of ingredient lists and are approximate.
Swaps and tips for families
- Choose baking powder labeled "aluminum-free."
- Natural cheese instead of processed slices.
- Homemade pancakes with aluminum-free baking powder.
Beyond the plate: related non-food exposures
Larger aluminum doses come from antacids and some buffered aspirins. Antiperspirants add only a little through the skin. Cooking acidic foods in aluminum pans adds a little.
Frequently asked questions
Does aluminum in baking powder cause Alzheimer's?
That hasn't been shown. Some aluminum from these additives is absorbed, but research on aluminum and Alzheimer's is mixed and mostly about water and work exposure.
What is aluminum-free baking powder?
It uses a different leavening acid instead of SALP or sodium aluminum sulfate. It works the same in most recipes.
Why is aluminum in processed cheese?
SALP is an emulsifying salt that keeps processed cheese smooth when it melts.
Related guides
- Phosphoric Acid and Phosphate Additives
- Talc (Magnesium Silicate)
- Flavors, flour treatments and more
Sources
Every source below was checked against PubMed, the publisher or the official page by our research team in October 2026.
- Increased urinary excretion of aluminium after ingestion of the food additive sodium aluminium phosphate (SALP) - a study on healthy volunteers. Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment, 2019. PubMed 31192767 · doi:10.1080/19440049.2019.1626998
- Environmental aluminum exposure and Alzheimer's disease risk: Evidence from a systematic review and meta-analysis. Ecotoxicology and environmental safety, 2025. PubMed 40749395 · doi:10.1016/j.ecoenv.2025.118759
- Safety of aluminium from dietary intake - Scientific Opinion of the Panel on Food Additives, Flavourings, Processing Aids and Food Contact Materials (AFC). EFSA journal. European Food Safety Authority, 2008. PubMed 37213837 · doi:10.2903/j.efsa.2008.754
- Re-evaluation of aluminium sulphates (E 520-523) and sodium aluminium phosphate (E 541) as food additives. EFSA journal. European Food Safety Authority, 2018. PubMed 32625999 · doi:10.2903/j.efsa.2018.5372
- 21 CFR 182.1781 Sodium aluminum phosphate. Link
- FoodData Central, Branded Foods dataset (release 2026-04-30). U.S. Department of Agriculture, Agricultural Research Service, 2026. Link
This guide is for general education. It is not medical advice and does not replace advice from your doctor, pediatrician, allergist or registered dietitian. If you think you or your child reacted to a food, talk to a health professional. Research changes; we review these pages when new evidence or rules come out. Last reviewed October 18, 2026. Spotted an error? Email [email protected].