What Is Ethyl Morrhuate?
Ethyl Morrhuate is the ethyl ester form of cod liver oil, meaning the natural fatty acids found in cod liver oil are chemically linked to ethanol to create lighter, more stable molecules. This conversion strips away the fishy scent while keeping the nourishing fatty acid profile rich in omega-3s. Cod liver oil has been used on skin for generations, but its heavy, greasy feel limited its popularity. In the mid-20th century chemists discovered that turning the oil into ethyl esters produced a silkier ingredient that blended more easily into creams and lotions. Today manufacturers obtain Ethyl Morrhuate through a process called transesterification, where purified cod liver oil reacts with food-grade ethanol under controlled heat. The result is a clear, low-odor liquid that dissolves well in both oils and many silicones. You will see it on ingredient lists for moisturizers, anti-aging creams, lip balms, body butters, after-sun gels, overnight masks and even some hair conditioners where a lightweight yet nourishing oil is desired.
Ethyl Morrhuate’s Cosmetic Benefits/Uses
In formulations Ethyl Morrhuate acts primarily as an emollient, meaning it softens and smooths the skin by filling in microscopic cracks on the surface. Its fatty acid profile helps reinforce the skin’s natural barrier which can reduce water loss and leave skin feeling supple and comfortable. Because it spreads easily and feels almost dry to the touch, it improves the texture of rich creams without making them greasy, adds a subtle sheen to lip products and can help disperse oil-soluble actives more evenly across the skin.
Who Can Use Ethyl Morrhuate
Ethyl Morrhuate suits most skin types, including dry, normal and combination skin, because it softens without feeling heavy. Oily or acne-prone skin may also tolerate it since the texture is lighter than traditional cod liver oil, but anyone who breaks out easily should monitor how their skin responds.
Because the ingredient is sourced from fish, it is not suitable for vegans or strict vegetarians. Pescatarians who eat fish products may be comfortable using it.
Pregnant or breastfeeding women generally can use products containing Ethyl Morrhuate, yet this is not medical advice. Anyone who is expecting or nursing should check with a doctor before adding new skincare products, just to be safe.
Ethyl Morrhuate does not make skin more sensitive to sunlight so it is not considered photosensitising. It also plays well with common skincare ingredients like vitamin C, niacinamide and most sunscreens.
Potential Side Effects/Adverse Reactions
Side effects from topical Ethyl Morrhuate vary from person to person. The issues listed below are only potential reactions and are unlikely for most users when the ingredient is properly formulated.
- Mild irritation or stinging on very sensitive skin
- Redness if an individual is allergic to fish derivatives
- Clogged pores in users who are highly acne-prone
- Rare contact dermatitis in people with existing fish oil sensitivities
If you notice any of these issues stop using the product and consult a healthcare professional.
Comedogenic Rating
Rating: 2 out of 5
The ethyl ester form is lighter than raw cod liver oil so it does not sit as heavily on the skin or block pores as easily. Still, its fatty acid content can trap debris if used in very rich formulas which is why it earns a moderate 2. Most people, including many who are prone to breakouts, tolerate it well but those who clog easily should monitor their skin.
Its comedogenic impact also depends on the entire formula: paired with volatile silicones or light esters it feels almost weightless while in thick balms it can edge closer to pore-clogging territory.
Summary
Ethyl Morrhuate is a lightweight emollient that softens skin, reinforces the barrier and helps disperse oil-soluble actives for an even finish. It gives the benefits of cod liver oil without the fishy scent or greasy after-feel, making it handy in creams, lip balms and conditioning hair care.
The ingredient is not a mainstream superstar but it maintains a steady presence in specialty moisturisers and lip products aimed at delivering omega-3 nourishment with a silky touch.
Topical use is regarded as low risk with only occasional irritation or mild pore clogging reported. As with any new skin care addition a brief patch test is wise to rule out personal sensitivities.