Dimethicone, Squalane, and Niacinamide: What Ingredients Make a Moisturiser Non-Comedogenic?

What does 'non-comedogenic' actually mean on a label?

A comedone is a blocked follicle — the skin lesion behind blackheads and whiteheads. A product labelled non-comedogenic is marketed as unlikely to cause that blockage. The problem is that no regulatory body, including the FDA, has published a legal definition or a mandatory test that a product must pass before the word appears on packaging.

The most widely cited testing method in dermatology research is the rabbit ear assay, which measures follicle plugging in animal tissue. Researchers and cosmetic chemists have questioned how reliably it predicts what happens on human facial skin. Some published dermatology reviews note that human patch testing on the upper back is more relevant but still imperfect.

In practice, the claim is controlled entirely by the brand. Scrutinising what ingredients are actually in the formula is a more reliable approach than trusting the front-of-pack wording.

Why does dimethicone appear in almost every non-comedogenic formula?

Dimethicone is a silicone polymer. It spreads in a thin, even film over the skin surface, locking in moisture without penetrating deeply into follicle openings. Because its molecular chains are too large to fit into a pore, it sits on top rather than settling inside.

The FDA classifies dimethicone as an approved skin protectant in its over-the-counter monograph system, with an established safety record for topical use. It is also listed in the EU Cosmetics Regulation's inventory of permitted ingredients. Independent cosmetic chemistry databases consistently assign it a low comedogenic rating.

Its limitation is texture: at high concentrations, dimethicone can leave a slightly silky or occlusive feel that some people find heavy. Formulators typically balance it with lighter co-emollients, which is why reading the full ingredient list still matters even when dimethicone leads the formula.

How does squalane differ from squalene, and which one is in skin products?

Squalene — with an 'e' at the end — is an unsaturated hydrocarbon produced naturally in human sebum. Because it has multiple double bonds, it oxidises relatively quickly when exposed to air, which makes it unstable in cosmetic formulations. Squalane is the hydrogenated, saturated form: chemically identical in its core structure but stable at room temperature.

Most squalane in products today is derived from sugarcane fermentation or olive oil rather than from shark liver, which was the historical source. Open Food Facts' ingredient taxonomy and cosmetic ingredient databases distinguish the two forms clearly. Because squalane so closely mirrors the skin's own lipid output, it absorbs quickly and rarely triggers the follicle blockage associated with heavier plant oils.

Comedogenicity rating scales — though imperfect — consistently place squalane near the bottom of the range. That low rating, combined with its fast absorption, is why formulators increasingly choose it over heavier emollients like coconut oil or shea butter in products aimed at oily or acne-prone skin types.

What role does niacinamide play beyond just being non-pore-blocking?

Niacinamide is a form of vitamin B3. Unlike dimethicone or squalane, it does not simply avoid blocking pores — it actively reduces the conditions that make pores appear enlarged. Multiple peer-reviewed studies indexed in PubMed have shown that topical niacinamide at concentrations of two to five percent can reduce sebum excretion rate over several weeks of consistent use.

The FDA recognises niacinamide as a safe cosmetic ingredient with a long history of use. The EU Cosmetics Regulation similarly permits it without restriction at typical cosmetic concentrations. Because it works on sebum regulation rather than purely on occlusion, it adds a functional layer to a non-comedogenic claim that most other emollients do not.

For an ingredient checker reviewing a moisturiser, niacinamide's presence near the top of a list — typically meaning a concentration meaningful enough to have an effect — is a genuine positive signal for people with combination or oily skin, not just a marketing addition.

Which ingredients are worth flagging as potentially comedogenic?

Cosmetic chemists have compiled comedogenicity scales for decades, though the data quality varies across those scales. Certain ingredients appear consistently toward the higher end regardless of the scoring method used: isopropyl myristate, isopropyl palmitate, lanolin and its derivatives, cocoa butter, and coconut oil are among the most frequently cited.

High-oleic oils — those with a high proportion of oleic acid, such as marula oil or some olive oils — have attracted attention in dermatology literature for their potential to disrupt the skin barrier in a way that encourages follicle plugging, though the research is not fully settled. Linoleic-acid-dominant oils, such as rosehip and hemp seed oil, are generally rated lower on comedogenicity scales.

It is worth noting that concentration matters: a small amount of a higher-rated ingredient appearing near the bottom of a list contributes far less to potential pore blockage than the same ingredient listed second or third. This is why position in the ingredient list is as informative as ingredient identity.

• Isopropyl myristate and isopropyl palmitate — consistently high on comedogenicity scales
• Lanolin and acetylated lanolin — heavy occlusive derived from wool grease
• Cocoa butter — rich in stearic and palmitic acids, rated moderate to high
• Coconut oil — high in lauric acid, frequently linked to follicle plugging in published scales
• High-oleic plant oils (marula, some olive-derived) — evidence is less settled but worth noting

Is there a 2026 update to how comedogenicity is tested?

The EU phased out animal testing for cosmetic ingredients under its Cosmetics Regulation, which means the rabbit ear assay is no longer a permissible route to market validation in European products. This has pushed formulators and contract labs toward in vitro follicle models and reconstructed human skin tissue assays. These methods are still maturing, and no single standardised replacement has been adopted globally.

Some cosmetic ingredient suppliers now publish their own in-house in vitro comedogenicity data, but without a shared protocol, those figures are hard to compare across companies. The International Journal of Cosmetic Science and similar peer-reviewed publications have called for harmonised methodology, but as of late 2026, a consensus standard does not yet exist.

The practical implication for shoppers is that 'non-comedogenic' on a 2026 product label may reflect rigorous in vitro testing, informal brand judgment, or anything in between. The best available shortcut remains checking what ingredients are in the formula against established low-comedogenicity lists.

How can an ingredient analyzer help you read a moisturiser label?

Skincare labels follow the same INCI (International Nomenclature of Cosmetic Ingredients) convention globally, listing ingredients from highest to lowest concentration. An ingredient analyzer like InZoRAH can cross-reference each name against regulatory databases and published comedogenicity ratings, surfacing which emollients sit high in the list and which potentially pore-blocking agents appear further down.

Because INCI names are often unfamiliar — cetearyl alcohol looks alarming but is not an occlusive problem ingredient; isopropyl myristate sounds innocuous but rates highly on comedogenicity scales — automated cross-referencing saves time and reduces guesswork. The tool draws on sources including FDA ingredient listings and Open Food Facts' cosmetic ingredient taxonomy.

Always read the physical label if you have a known skin sensitivity or allergy; a digital scan adds context but does not replace your own observation of a product's full formulation.