Ingredient review
Potassium Bromide
INCI: POTASSIUM BROMIDE
Potassium bromide is a synthetic salt used as a preservative, but it has limited cosmetic use and potential irritation concerns.
In plain English
Potassium bromide is a simple salt, similar to table salt but with a different chemical structure. In skincare, it's sometimes added to help preserve the product or keep ingredients stable. However, it's not a common or highly recommended ingredient because it can be irritating for some people and has better alternatives available.
Review score
Safety, usefulness, and evidence
Higher-caution ingredient
The evidence base is useful, but some claims depend heavily on the formula.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Read the cautions before using
Potassium Bromide 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 Potassium Bromide.
- 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
moderateThere is useful support, but formula details and claim strength still matter.
What it is
Potassium bromide is an inorganic salt composed of potassium and bromide ions. It is a white crystalline powder that dissolves easily in water.
How it works
In cosmetics, potassium bromide acts primarily as a preservative by creating an environment that discourages microbial growth. It can also help stabilize the pH or ionic strength of a formulation, which may improve the texture or shelf life of the product.
Pros
Preserves product integrity
Potassium bromide helps prevent microbial contamination, which can extend the shelf life of water-based cosmetics and reduce the risk of spoilage.
Simple and stable
As a simple salt, it is chemically stable and does not easily degrade, making it a reliable option for formulators looking for a basic preservative.
Cons and cautions
Potential irritation
Bromide salts can be irritating to the skin, especially for those with sensitive or compromised skin barriers, leading to redness or discomfort.
Limited cosmetic research
There is very little modern research on the safety and efficacy of potassium bromide in topical cosmetics, making it a less trusted choice compared to well-studied alternatives.
Best for
- People with normal skin looking for preserved products
- Those using products with a short shelf life
Use caution if
- People with sensitive or reactive skin
- Anyone with a known bromide allergy or sensitivity
Usage tips
Safety summary
Potassium bromide has moderate irritation potential and limited safety data for cosmetic use. It is generally considered safe at very low concentrations, but sensitive individuals should avoid it.
Research notes
Research on potassium bromide in cosmetics is sparse. Most available data comes from its use in other industries, such as veterinary medicine, where it is used as an anticonvulsant. There are no major clinical studies on its topical safety.
Common label clues
- Typical concentration
- Very low, typically under 1%
- Regulatory status
- Potassium bromide is not specifically restricted in cosmetics by the FDA, but it is not widely recommended due to limited safety data and better alternatives.
- Common uses
- Preserved water-based products, Stabilized formulations
- Environmental note
- Bromide compounds can persist in the environment and may accumulate in water systems, though the small amounts used in cosmetics are unlikely to have a significant impact.
Good to know
- Potassium bromide is more commonly used in veterinary medicine as an anticonvulsant, not in human cosmetics.
- It is not a common ingredient in modern skincare; you are more likely to find it in very old or niche formulations.
Common questions
What is Potassium Bromide in beauty products?
Potassium bromide is a simple salt, similar to table salt but with a different chemical structure. In skincare, it's sometimes added to help preserve the product or keep ingredients stable. However, it's not a common or highly recommended ingredient because it can be irritating for some people and has better alternatives available.
What does Potassium Bromide do in a beauty product?
In cosmetics, potassium bromide acts primarily as a preservative by creating an environment that discourages microbial growth. It can also help stabilize the pH or ionic strength of a formulation, which may improve the texture or shelf life of the product.
Is Potassium Bromide safe for most people?
Potassium bromide has moderate irritation potential and limited safety data for cosmetic use. It is generally considered safe at very low concentrations, but sensitive individuals should avoid it.
Who should be careful with Potassium Bromide?
People with sensitive or reactive skin Anyone with a known bromide allergy or sensitivity
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.