Plant Sterols and Stanols in Foods and Fortified Spreads
What plant sterols and stanols are, how they appear in fortified spreads and foods, what trials show for LDL cholesterol, FDA claim levels and limits in the sources read.
Content last updated . This page has not been medically reviewed.
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Short answer: Plant sterols and stanols (together called phytosterols) are plant compounds added to some fortified foods. A meta-analysis of randomized trials found they lower LDL cholesterol. The evidence is for a blood marker, and safety questions were raised about higher blood sterol levels.
What they are
Plant sterols and plant stanols are cholesterol-like compounds from plants. The US health-claim rule for them applies to certain foods, specifically spreads and salad dressings among others, which shows they are used as added ingredients. [1] See fortified foods for what fortification means.
What research shows
| Question | What the source found | Strength of evidence | Population and form |
|---|---|---|---|
| LDL cholesterol | Meta-analysis of 124 studies: intakes of 0.6 to 3.3 g a day lowered LDL by 6 to 12 percent on average, rising up to about 3 g a day. Sterols and stanols behaved comparably. [2] | Established for LDL | Controlled studies of plant sterols and stanols (forms vary) |
| Heart events | Proper evidence not found here. We searched PubMed for cardiovascular safety and outcomes; the review read discusses safety arguments but we did not read outcome trials. | Insufficient evidence | |
| Blood sterol levels | A review notes regular intake of these foods lowers LDL by about 10 percent and about doubles plasma plant sterol or stanol levels, which raised safety questions the review evaluates. [3] | Safety question, not settled in what we read |
Food context
Cholesterol advice usually places fortified foods alongside fiber, nuts and legumes. See foods for cholesterol and heart health and beta-glucan in foods. Read the Nutrition Facts panel on any product using reading food labels.
Frequently asked questions
Do plant sterols lower cholesterol?
Yes, in a meta-analysis of 124 randomized studies, intakes of 0.6 to 3.3 g a day lowered LDL by 6 to 12 percent on average. [2]
Are stanols different from sterols?
The meta-analysis found clear and comparable dose-response relationships when analyzed separately. [2] The FDA claim lists different daily levels for sterol and stanol esters. [1]
Do they prevent heart attacks?
Proper evidence not found in what we read. The trials measured LDL cholesterol.
Are they safe long term?
A review notes that blood plant sterol levels about double with regular intake, which raised questions it evaluates. [3] We do not state a verdict. Ask a clinician about your own situation.
Do natural foods contain them too?
The sources we read for this page described them in fortified products. We did not read a source on natural food amounts, so none is given.
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
What regulators say
Under US rules (21 CFR 101.83), a food may carry a health claim linking plant sterol or stanol esters to a lower risk of heart disease if certain conditions are met. The claim names daily intake levels associated with the effect, 1.3 g or more a day of plant sterol esters or 3.4 g or more a day of plant stanol esters, eaten in two servings at different times of day. [1] That is a labeling rule, not a personal recommendation.
Safety and who should ask a clinician
- Cholesterol medicines: we did not read a source on interactions with statins or other cholesterol medicines, so none is stated. Ask the prescriber or pharmacist, and see supplements and statins.
- Pregnancy, breastfeeding and children: not described in the sources we read. Ask a clinician.
- Whole foods versus added sterols: the studies concern amounts that fortified foods deliver; foods not fortified were not the subject of these results.
- No other source on harms was read, and lack of a finding is not proof of safety.
References
- 21 CFR 101.83, Health claims: plant sterol/stanol esters and risk of coronary heart disease. US Electronic Code of Federal Regulations. Read 2026-10-23.
- LDL-cholesterol-lowering effect of plant sterols and stanols across different dose ranges: a meta-analysis of randomised controlled studies. Br J Nutr 2014. PMID 24780090. Read 2026-10-23.
- Cardiovascular Safety of Plant Sterol and Stanol Consumption. J AOAC Int 2015. PMID 25942652. Read 2026-10-23.