What do ceramides actually do for your skin?

Ceramides hold your skin barrier together

Bottom line: ceramides are one of the main structural lipids in your skin's outer layer, and they help keep that layer intact. Among those lipids they are the most abundant and the most varied, and they arrange into layered structures that act as a seal [1].

That layered matrix also binds water and slows its escape from the epidermis [2]. When ceramide levels drop, transepidermal water loss, the water that evaporates through the skin, tends to rise [4]. Ceramides are often described as roughly half of the intercellular lipid mass, but that figure comes from a trial registry description, not a primary measurement [3].

Where the evidence is strongest: dry and eczema-prone skin

Bottom line: topical ceramides have the best support in dry or barrier-impaired skin, especially atopic dermatitis (AD). Ceramide levels are lower in the outer layer of people with AD, and treatments that raise them are used in AD care [1].

A qualitative review found 12 eligible studies out of 41 reports. Those studies showed that external ceramide preparations can improve dry skin and barrier function in people with AD. The reviewers called for a larger, double-blinded comparative trial, and the clinical studies reported no adverse events of note [2].

A 2024 review of one pseudo-ceramide moisturizer reported that more than 60% of people with mild to moderate AD significantly improved, along with better barrier function. That is a product-specific review, so it does not settle the question for all ceramide products [1].

In a randomized, investigator-blinded trial of Chinese children with mild to moderate AD, a ceramide moisturizer with body wash was tested for delaying flares during latent disease [6]. The abstract we reviewed gave design details but not sample size or flare-time results, so we could not judge the effect size.

Anti-aging claims are thinner than the marketing

Bottom line: the evidence that ceramides reduce wrinkles is weak. Ceramide levels do decline with age, and one rice-ceramide study cites earlier work suggesting drops of up to 30% of total skin lipid profile compared with young stratum corneum [4].

The main supportive study was an open-label trial at three sites. It reported significant gains in hydration, sebum, firmness, elasticity and wrinkle severity (p < 0.01). With no control group, it cannot separate the product's effect from time or expectation, though older participants responded more [4].

Oral ceramides and look-alike ingredients

Bottom line: oral ceramide evidence is limited to one trial we could only partly assess. In a 12-week, randomized, double-blind, placebo-controlled study of adults aged 20 to 60 with self-reported dry skin, a fermented food containing 0.8 mg of dihydroceramide improved skin hydration, with no harmful effects [8]. The sample size and effect sizes were not visible in the abstract, so check the full paper.

Not every ceramide claim involves a true ceramide. A nano-emulsion with 10% of a ceramide-like lipo-amino acid derivative significantly improved dryness, itchiness and stinging in non-lesional AD skin at 3 and 6 weeks (p < 0.0001). The authors attribute the benefit to better water-holding function rather than improved barrier function, so it should not be read as direct ceramide evidence [7].

What to take from this

• Dry or eczema-prone skin: the evidence is the most credible here, though most trials are small or product-specific.
• Anti-aging: treat wrinkle and firmness claims as unproven until controlled trials confirm them.
• Oral ceramides: one placebo-controlled trial suggests a hydration benefit, but the numbers need checking.
• Labels: check whether the product lists true ceramides or a ceramide-like ingredient.

We did not find a formal position statement from a dermatology or regulatory body on topical or oral ceramides, and we could not verify whether one exists. A 2023 systematic review and meta-analysis comparing ceramide moisturizers with other moisturizers exists, but we could not read its findings.

Our reading came from abstracts and snippets, not full texts. Funding and conflicts of interest were not consistently visible, and many studies are small or industry-linked. Read the full papers before quoting any number from this page.