Ingredient review
Sodium Aluminum Hydroxide Oxalate Sulfate
INCI: SODIUM/ALUMINUM HYDROXIDE/OXALATE/SULFATE
This mineral salt helps control product pH but has very limited research on its long-term skin effects, so it's best used in small amounts.
In plain English
This ingredient is a lab-made mineral salt that helps keep the pH of your skincare product stable. It's not a star active like vitamin C or hyaluronic acid, but a behind-the-scenes helper. Because it contains aluminum and oxalate, there are some theoretical concerns about absorption, though in the tiny amounts used in cosmetics it's generally considered safe by regulators. Still, it's not a well-studied ingredient for skin benefits.
Review score
Safety, usefulness, and evidence
Higher-caution ingredient
The evidence base is still emerging, so marketing claims deserve extra caution.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- emerging
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Read the cautions before using
Sodium Aluminum Hydroxide Oxalate Sulfate can be useful, but watch for some irritation potential.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Sodium Aluminum Hydroxide Oxalate Sulfate.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
emergingThe ingredient may be promising, but claims should be treated more cautiously.
What it is
A synthetic mineral salt combining sodium, aluminum, hydroxide, oxalate, and sulfate ions. It is used in cosmetics as a buffering agent to maintain a stable pH range.
How it works
When added to a formula, it reacts with acids or bases to resist pH changes. This helps keep the product's acidity or alkalinity within a desired range, which can improve stability and skin compatibility.
Pros
pH stability
Helps keep your product's pH consistent from first use to last, which can improve efficacy and reduce irritation from pH swings.
Low comedogenic risk
Unlikely to clog pores, making it suitable for acne-prone skin when used in appropriate concentrations.
Cons and cautions
Limited skin research
There is very little published research on how this specific salt interacts with skin over time, so its long-term effects are not well understood.
Aluminum content
Aluminum compounds have been debated for potential absorption and health effects, though cosmetic use is generally considered safe at low levels.
Best for
- People using pH-sensitive products like vitamin C serums
- Anyone wanting a stable formula that doesn't change pH over time
Use caution if
- Those with very sensitive or reactive skin
- Individuals concerned about aluminum exposure in cosmetics
Usage tips
Safety summary
Generally recognized as safe in low concentrations for cosmetic use, but lacks robust safety data specific to skin. The aluminum and oxalate components warrant caution for sensitive individuals, though no major adverse events have been reported.
Research notes
Very limited peer-reviewed research exists on this specific compound in cosmetics. Most safety assessments rely on general knowledge of its constituent ions and their behavior in topical formulations.
Common label clues
- Typical concentration
- Very low (typically under 1%)
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database, with no specific restrictions at typical use levels. However, it is not a common or well-studied ingredient.
- Common uses
- Cleansers, Toners, Leave-on products
- Environmental note
- Synthetic mineral salts like this are produced through chemical processes; their environmental impact is low due to small usage amounts, but mining of raw materials can have ecological effects.
Good to know
- This ingredient is rarely listed alone; it's usually part of a complex buffer system.
- The oxalate component is a salt of oxalic acid, which can be irritating in high amounts, but cosmetic levels are very low.
Common questions
What is Sodium Aluminum Hydroxide Oxalate Sulfate in beauty products?
This ingredient is a lab-made mineral salt that helps keep the pH of your skincare product stable. It's not a star active like vitamin C or hyaluronic acid, but a behind-the-scenes helper. Because it contains aluminum and oxalate, there are some theoretical concerns about absorption, though in the tiny amounts used in cosmetics it's generally considered safe by regulators. Still, it's not a well-studied ingredient for skin benefits.
What does Sodium Aluminum Hydroxide Oxalate Sulfate do in a beauty product?
When added to a formula, it reacts with acids or bases to resist pH changes. This helps keep the product's acidity or alkalinity within a desired range, which can improve stability and skin compatibility.
Is Sodium Aluminum Hydroxide Oxalate Sulfate safe for most people?
Generally recognized as safe in low concentrations for cosmetic use, but lacks robust safety data specific to skin. The aluminum and oxalate components warrant caution for sensitive individuals, though no major adverse events have been reported.
Who should be careful with Sodium Aluminum Hydroxide Oxalate Sulfate?
Those with very sensitive or reactive skin Individuals concerned about aluminum exposure in cosmetics
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.