SHALE OILS

Quick Facts:

• Category: other
• Also Known As: Shale oils

Proven Benefits At A Glance:

• Shale oils contain phenols (25–30% in Estonian shale oil), which are responsible for their toxic effects
• Shale oils can irritate skin and mucous membranes on contact
• Repeated exposure to shale oils may trigger sensitization (allergic-type reactions) in the body
• Animal studies found that shale oil affects the nervous system, liver, and kidney function with long-term exposure
• The toxic effects of shale oils are primarily driven by their phenol content, not other components

Safety tier is a starting heuristic from regulatory status and comedogenic rating, not a dermatological verdict — see our Terms for the full disclaimer. Research confidence reflects how many real cited studies back this ingredient, not the strength of their findings.

🧪 SHALE OILS

SHALE OILS

CAS Number: 68308-34-9

Also Known As: Shale oils

Category: other

SHALE OILS is an other ingredient used in skincare formulations.

🌍 Regulatory Status

📊 Comedogenicity

📚 Research & Evidence

🔬 The Science

Shale oils are complex mixtures where phenols—organic compounds with a characteristic chemical structure—make up roughly a quarter to a third of the total composition in some varieties. These phenols are what determines how toxic shale oil is overall (Environ Health Perspect, 1979). #1: Shale oils produce local irritation on skin and mucous membranes, meaning they can cause redness, irritation, or burning where they contact these tissues (Environ Health Perspect, 1979). #2: Repeated application of shale oil can cause sensitization, a process where the immune system becomes increasingly reactive to the substance, similar to developing an allergy (Environ Health Perspect, 1979).

#3: In animal experiments lasting 4–6 months, researchers observed changes in liver and kidney function, suggesting these organs can be affected by chronic exposure (Environ Health Perspect, 1979). The phenolic compounds within shale oil—including specific types called dimethylphenols and 5-methylresorcinol—have been classified as moderately toxic in acute (short-term) poisoning tests. However, the research abstract provided does not describe benefits or positive skincare effects of shale oils; the available evidence focuses exclusively on toxicity and irritation concerns in animal studies and occupational health contexts.

💧 Skin Type Compatibility

⚠️ Don’t Combine With

🧴 Products Containing SHALE OILS

📄 Related Research

Matched by search — not necessarily verified support for every statement above.

• Veldre IA et al. (1979). Toxicological studies of shale oils, some of their components, and commercial products. Environ Health Perspect.
• Salfeld K et al. (1966). [On the effect of different antieczematic agents on the normal skin of guinea pigs. 3. Tars and shale oils in low concentration]. Arch Klin Exp Dermatol.