Potassium Sorbate: Comedogenic Rating & Ingredient Analysis
Potassium sorbate is a mild, food-grade preservative (E202) that has become a favourite in gentle and natural-leaning skincare. Like sodium benzoate, it is a salt of an organic acid — in this case sorbic acid — and it is prized for a low irritation profile and broad acceptance under organic standards. It is especially good at controlling mould and yeast, and it is very commonly paired with sodium benzoate, the two together giving a preservative system that covers a wide microbial range while staying gentle enough for sensitive-skin and baby-care products.
Quick facts
- Comedogenic rating
- our estimate — not measured
- Irritation risk
- Low
- Effective pH
- below 6.0
- Typical strength
- 0.1–0.5%
- Pregnancy
- Considered safe
- Suits skin types
- oilydrycombinationsensitivenormalacne-prone
Where this number comes from
No one has published a comedogenic rating for this ingredient. Fulton's 1989 table tested about 250 raw materials and this was not among them, and we found no later study measuring it. The figure shown is our own reasoning from the ingredient's chemistry and how it is used — treat it as an estimate, not a measurement.
Fulton read his own scale as 0-1 not significant, 2-3 borderline, 4-5 positive. The assay is the rabbit ear at 10% dilution, which the paper itself calls extremely sensitive and not fully predictive of human skin. Ratings describe the raw ingredient; concentration and formulation change real-world behaviour.
Caution profile
The four published fields on this page, on one 0–5 scale. Further from the centre means more care is needed — never that the ingredient is worse.
Derived, not measured: pore-clogging is the published comedogenic rating; irritation maps low/moderate/high to 1/3/5; pregnancy maps safe/caution/avoid to 0/3/5; skin-type limits is how many of the seven skin types this entry does NOT list. Every input is printed in words in the quick-facts card above.
Show the numbers
| Metric | 0–5 | Published field |
|---|---|---|
| Pore-clogging | 0 | 0/5 |
| Irritation | 1 | Low |
| Skin-type limits | 0.7 | 6/7 |
| Pregnancy | 0 | Considered safe |
Working pH and typical strength
Where this ingredient is formulated to sit, and at what concentration.
Both bars come from the fields above: the pH window and the typical strength range published for this ingredient. The tinted column is healthy skin's surface pH (about 4.7–5.75).
Show the numbers
| Metric | 0–5 |
|---|---|
| Working pH | below 6.0 |
| Typical strength | 0.1–0.5% |
What is it?
Potassium sorbate works by releasing sorbic acid in the formula, and it is that acid form that inhibits the growth of fungi and, to a lesser extent, bacteria. Because of this, it depends on an acidic environment to function well, generally below pH 6. It has no active benefit for the skin itself; its entire role is to keep water-containing products free of spoilage organisms. It is one of the best-tolerated preservatives, with a comedogenic rating of zero and a low rate of allergy, which is why it turns up so often in products aimed at reactive, delicate or acne-prone skin.
Benefits
Gentle broad protection
It controls mould and yeast effectively and, paired with a partner preservative, contributes to broad-spectrum protection with a low irritation profile.
Food-grade safety record
As a long-established food and cosmetic preservative, it has extensive safety data and is well tolerated by most skin types.
Suits natural formulations
It is accepted by many organic and eco certifications, making it a popular preservative for clean-beauty and sensitive-skin ranges.
Non-comedogenic
Used at low concentration, it does not clog pores or contribute to breakouts, so it is appropriate for acne-prone skin.
How to use
Potassium sorbate is a background preservative — nothing to apply directly, and no routine adjustments needed. It works only in acidic formulas, so it is most common in low-pH products, frequently alongside sodium-benzoate and compatible with actives such as niacinamide, hyaluronic-acid and glycerin. There is no reason to seek it out or avoid it beyond individual tolerance, and it is a solid sign of a gentle, well-considered preservative system when you see it on a sensitive-skin product.
Side effects
Potassium sorbate is well tolerated by the large majority of users. A small number may notice mild transient irritation in strongly acidic formulas, and true allergic reactions are uncommon. It ranks among the gentlest preservatives, which is exactly why it is so widely used in products designed for delicate skin. Patch testing remains sensible if you have previously reacted to preservatives.
Who should avoid it
Only people with a confirmed sensitivity to sorbates need to avoid potassium sorbate, which is rare. There is no general reason for sensitive or acne-prone skin to reject it, and it is often specifically chosen for those groups. If you have reacted to it before, check labels and select an alternative preservative system.
Pairs well with
Frequently asked questions
Is potassium sorbate safe for skin?
Yes. It is a food-grade preservative with a long safety record and a low irritation and allergy profile, permitted by regulators within set limits and often used in sensitive-skin products.
Why is potassium sorbate combined with sodium benzoate?
Potassium sorbate is strong against mould and yeast, and sodium benzoate adds coverage against bacteria, so together they form a gentle but broad-spectrum preservative system.
Does potassium sorbate need low pH?
Yes. It must convert to sorbic acid to work, which happens mainly in acidic formulas below about pH 6. In higher-pH products it loses much of its preservative effect.
Can potassium sorbate cause breakouts?
No. It has a comedogenic rating of zero, is used at low concentration, and does not clog pores, so it does not cause acne and suits breakout-prone skin.
Sources & further reading
Medical disclaimer
Find your personal acne triggers
Our free Acne Tracker lets you log breakouts, sleep, stress and diet, and shows you which factors correlate with your flare-ups.