Nobody in my palm oil farming hometown hydrogenates palm oil, yet hydrogenated palm oil and kernel oil now reach Nigerian shelves inside margarine, biscuits, and creamers. I studied chemical engineering, so the process behind these fats is familiar to me. This page sets out what each oil is and what the label tells you.
Hydrogenation is a factory process that adds hydrogen to oil, turning some or all of its liquid fats into solid ones.
Both palm oil and palm kernel oil go through it, but they start very differently and end up in different products.
This page explains the process and the difference between partial and full hydrogenation, and gives each oil its own section, covering its fat profile, texture and main uses.
It also covers trans fats, the rules in the United States and Nigeria, health questions and labels.
Red palm oil, the kitchen oil, is never hydrogenated in any way.
Red palm oil comes straight from the fruit, with no hydrogen, catalysts or factory steps involved. The shop page sells unprocessed red oil from Ntigha, filtered and fresh.
Table of Contents
What Is Hydrogenation?
Hydrogenation is a chemical process that bubbles hydrogen gas through heated oil in the presence of a metal catalyst, usually nickel.
The hydrogen attaches to the double bonds in unsaturated fatty acids, turning them into saturated ones. As more double bonds disappear, the oil’s melting point rises and it becomes firmer and more stable.
Manufacturers use it to turn liquid oils into solid fats for spreads, shortenings and coatings, and to slow rancidity.
The catalyst is filtered out afterward, and the result is a pale, firm, almost tasteless fat.
Partial vs Full Hydrogenation
The degree of hydrogenation decides if trans fats form, and that is the most important health difference.
| Feature | Partial hydrogenation | Full hydrogenation |
|---|---|---|
| Double bonds left | Some remain | Almost none remain |
| Trans fats | Form during the process | Very little, since few double bonds survive |
| Texture | Soft and spreadable | Hard and waxy |
| Typical label wording | Partially hydrogenated oil | Hydrogenated or fully hydrogenated oil |
| Legal status | Banned or capped in many countries | Still permitted |
Fully hydrogenated fats are usually too hard to use alone, so makers blend or interesterify them with liquid oils. Interesterification rearranges fatty acids on the fat molecule without creating trans fats.
Why Palm Oils Need Less Hydrogenation
Palm oil and palm kernel oil are already semi-solid in cool weather, unlike soybean or sunflower oil. That natural firmness means they need less hydrogenation to become solid fats.
A 2017 review in the Journal of Oil Palm Research noted that fractionation, interesterification and hydrogenation together widened the use of palm fats in confectionery. Fractionation, which separates solid and liquid parts by cooling, can replace hydrogenation entirely.
How refineries fractionate palm oil into olein and stearin is covered in refined palm oil and its fractions.
Hydrogenated Palm Oil
What It Is
Hydrogenated palm oil is refined palm fruit oil that has been treated with hydrogen to make it firmer. Palm oil starts at about half saturated fat, mostly palmitic acid, with oleic acid making up much of the rest.
Hydrogenation turns that oleic acid into stearic acid, a saturated fat with a higher melting point. Fully hydrogenated palm oil is therefore almost entirely palmitic and stearic acids.
Where It Is Used
- Shortenings and margarines. It adds firmness and helps blends stay solid at room temperature.
- Baked goods. It gives structure and crispness to pastry, cookies and crackers.
- Snack and confectionery coatings. It sets firm and resists melting in warm shops.
- Cosmetics. Listed as hydrogenated palm oil or under glyceride names, it thickens creams and balms.
Many food makers now prefer fractionated or interesterified palm fats over hydrogenated palm oil, because they avoid the word hydrogenated on labels.
Hydrogenated Palm Kernel Oil
What It Is
Hydrogenated palm kernel oil comes from the seed inside the palm nut, not the fruit flesh. Palm kernel oil is already about four-fifths saturated, rich in lauric and myristic acids.
Hydrogenation converts its small share of unsaturated fat into stearic acid, leaving an almost fully saturated fat. The result is hard and brittle, and it melts sharply near body temperature.
That sharp melt is why confectioners value it, since a coating made with it snaps, then melts quickly in the mouth.
Where It Is Used
A palm kernel oil product sheet from ADM, a major US oil supplier, lists hydrogenated kernel oil for several uses.
- Confectionery coatings. It replaces part of the cocoa butter in compound chocolate and candy coatings.
- Whipped toppings. It gives non-dairy toppings their body, stiffness and stability.
- Coffee whiteners. It provides the fat in many powdered and liquid non-dairy creamers.
- Dairy replacements. It stands in for milk fat in some fillings and desserts.
- Cosmetics and soaps. It firms bars and adds richness to balms and creams.
The same sheet lists trans fat below 1 or 2 percent for these products, depending on the grade. Black kernel oil, ude aki, made by roasting kernels at home, is a different product, covered in palm kernel oil and ude aki.
The Two Oils Side by Side
| Feature | Hydrogenated palm oil | Hydrogenated palm kernel oil |
|---|---|---|
| Source | Fruit flesh | Kernel inside the nut |
| Saturated fat before hydrogenation | About half | About four fifths |
| Main fatty acids after full hydrogenation | Palmitic and stearic | Lauric, myristic and stearic |
| Texture | Firm and waxy | Hard and brittle, with a sharp melt |
| Main food uses | Shortenings, margarines, baked goods | Coatings, whipped toppings, coffee whiteners |
Trans Fats and the Rules
Partially hydrogenated oils were the main source of artificial trans fats in processed foods. Governments in many countries have moved against them over the past decade.
The US Food and Drug Administration ruled in 2015 that partially hydrogenated oils are not generally recognized as safe. Makers generally had to stop adding them to foods by 18 June 2018.
Nigeria followed with the Fats, Oil and Food Containing Fats and Oil Regulation 2022. Radio Nigeria reported in 2023 that NAFDAC gazetted rules capping industrial trans fats at 2 percent of total fat.
NAFDAC’s Director General described the measure as banning partially hydrogenated oils, the source of industrial trans fats, in all foods. A revised prepackaged food labeling regulation also added trans fat labeling requirements.
These rules target partial hydrogenation, so fully hydrogenated palm and kernel oils remain legal, because they contain very little trans fat.
Health Questions
Partially hydrogenated palm or kernel oil carries the trans fat risk that led to bans worldwide. The World Health Organization advises keeping trans fats below 1 percent of total energy intake.
Fully hydrogenated oils swap that risk for a high saturated fat load. Stearic acid appears gentler on LDL cholesterol than palmitic acid in trials, as covered in palm oil’s effect on cholesterol.
Hydrogenated kernel oil is almost fully saturated, mostly lauric and myristic acids, which raise LDL cholesterol in trials. Research on kernel oil itself is summarized in the kernel oil health evidence.
Research on interesterified fats in people is still limited, so firm conclusions are not yet possible. Health bodies advise limiting saturated fat overall, whatever its source or form.
Reading the Label
| Label wording | What it means |
|---|---|
| Partially hydrogenated palm oil | Contains trans fats, now banned or capped in many countries |
| Hydrogenated or fully hydrogenated palm oil | Very little trans fat, but highly saturated |
| Hydrogenated palm kernel oil | Almost fully saturated kernel fat, common in creamers and coatings |
| Interesterified palm fat | Rearranged fat with no trans fats from the process |
| Vegetable fat or vegetable oil | May hide palm or palm kernel fats without naming them |
Palm fats in snacks and spreads are traced further in palm fats in packaged foods. Cosmetic names such as hydrogenated palm glycerides are decoded in palm names in cosmetics.
Conclusion
Hydrogenated palm oil and hydrogenated palm kernel oil are factory fats, made by adding hydrogen to refined oils.
Palm oil becomes firm shortening for margarine and baking, while kernel oil becomes the hard fat in coatings, toppings and creamers.
Partial hydrogenation creates trans fats, which the United States and Nigeria now ban or cap in foods.
Full hydrogenation avoids most trans fats but leaves behind a very saturated fat. Read labels closely, limit saturated fats overall, and choose fresh red palm oil when you cook at home.
Frequently Asked Questions
Is hydrogenated palm oil bad for you?
Partially hydrogenated palm oil contains trans fats, now banned or capped widely. Fully hydrogenated palm oil has very little trans fat but is very high in saturated fat.
What is hydrogenated palm kernel oil used for?
It gives the snap to candy coatings and the body to whipped toppings and creamers. Soap and cosmetic makers also use it to firm bars and enrich balms.
Does hydrogenated palm oil contain trans fats?
Partially hydrogenated palm oil does contain trans fats, which is why it is restricted. Fully hydrogenated palm oil contains very little, because almost all double bonds become saturated.
Is hydrogenated palm oil allowed in Nigeria?
Nigeria’s 2022 fats and oils regulation caps industrial trans fats at 2 percent of total fat. It targets partially hydrogenated oils, and fully hydrogenated fats remain legally permitted.
Disclaimer. This article is for informational purposes only and does not constitute medical or nutritional advice. The author is not a registered dietitian or medical professional. Where the research on health effects is mixed or contested, this is stated clearly in the article. Consult a qualified healthcare provider before making significant dietary changes.
Chimeremeze Emeh is a tropical crop farmer and chemical engineer from Ntigha, Isiala Ngwa North LGA, Abia State, Eastern Nigeria, specializing in palm oil and cassava, with over 30 years of hands-on experience growing, harvesting, and processing red palm oil. He runs community engagement workshops for rural farmers in Ntigha focused on palm tree care, and operates Palm Oil Pathway as a registered agribusiness and sells red palm oil in 1L, 2L, 3L, and 25L packaging. Built around red palm oil production. He is also the founder of Cassava Pathway, a CAMA-registered agribusiness founded in 2024, where he applies the same tropical farming expertise to cassava flour and starch production.