Oils and fats
Partially hydrogenated oil
Definition
What it is
Partially hydrogenated oil: artificial trans fat linked to cardiovascular disease. Banned in the US, EU, Canada, and other jurisdictions.
On the label
Label names covered by this flag
- partially hydrogenated oil
- partially hydrogenated
- partially-hydrogenated
Regulation
Regulatory status
- Canada Banned
- European Union Banned
- United States Restricted
Explainer
In plain language
Partially hydrogenated oil is a vegetable oil that has been chemically processed by adding hydrogen to make it more solid and shelf-stable. This process creates artificial trans fats. For decades it was used in margarine, fried foods, and baked goods because it was cheap, gave a long shelf life, and held up to repeated frying.
Assessment
Why it is flagged
Artificial trans fats from partially hydrogenated oils are among the most firmly established dietary risks in nutrition science, linked to raised LDL cholesterol, lowered HDL cholesterol, and increased cardiovascular disease. In 2015 the FDA determined that partially hydrogenated oils are no longer generally recognized as safe, and set a compliance deadline that removed them from the US food supply. The EU, Canada, and the World Health Organization have taken similar steps to eliminate industrial trans fats. Because the evidence and the regulatory action are so consistent, this is one of the clearest cases on Clear Label. You are most likely to encounter it only in older imported products or in trace amounts below labeling thresholds.
In the aisle
Where it commonly shows up
- Older stick margarines and shortening
- Some imported baked goods
- Older packaged fried snacks
- Legacy microwave popcorn
- Some non-dairy creamers
Practical
Reading the label
The clearest signal is the phrase partially hydrogenated in the ingredient list, even when a Nutrition Facts panel shows 0 g trans fat, because US rules allow rounding down below half a gram per serving. Reading the ingredient list rather than only the trans fat number is the reliable check.
Alternatives
If you want to avoid it
Products made with liquid vegetable oils, butter, or non-hydrogenated fats avoid artificial trans fats. Since the US removal, most current products already use these instead.
FAQ
Common questions
Are partially hydrogenated oils banned in the US?
Effectively yes. The FDA ruled in 2015 that they are no longer generally recognized as safe, and set compliance dates that removed them from the food supply. The EU, Canada, and others have similar limits.
Why does a label say 0 g trans fat but list partially hydrogenated oil?
US rules let manufacturers round amounts below half a gram per serving down to zero. Seeing partially hydrogenated in the ingredient list means trans fat is present even when the panel shows 0 g.
Is partially hydrogenated oil the same as fully hydrogenated oil?
No. Fully hydrogenated oil is saturated and contains essentially no trans fat, while partial hydrogenation is what creates artificial trans fats. Only the partial form is the flagged concern here.
Citations
Sources
Citation
Primary reference
About this page: the definition, label names, severity, and regulatory chips come from the clearlabel ingredient taxonomy, the same data the scanner uses to score products. Research summaries describe associations reported in published studies, not diagnoses; individual responses vary. Scan any product with clearlabel to see which of its ingredients carry flags.