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Plant Sterols and Stanols (Phytosterols)
Plant sterols and stanols taken at about 2 to 3 g a day, usually in fortified foods or as capsules, lower LDL cholesterol by roughly 6 to 12% in more than a hundred randomised trials. No trial has tested whether they prevent heart attacks or strokes.
What the evidence says
Plant Sterols & Stanols doesn't have enough studies with structured effect-size data yet to pool a verdict. Browse the studies below for individual findings.
Most evidence is from high-quality meta-analyses and randomised trials published 2003–2026 with a typical study size of 500 participants.
Based on 15 studies · 9 meta-analyses · 2 RCTs · 965,369 total participants
Confidence
High confidenceBy outcome
Strong 7.0 for one outcome, LDL cholesterol: more than a hundred randomised trials pooled in several meta-analyses agree that about 2 g a day lowers LDL by roughly 8 to 10%, a 2026 umbrella review rated the certainty high, and the effect adds to statins. It is held at the bottom of Strong because no randomised trial has measured heart attacks, strokes or deaths, a large genetic study suggests absorbed plant sterols may themselves be atherogenic, and two of the main dose-response meta-analyses come from authors at a maker of sterol-enriched spreads.
Plant sterols and plant stanols (together called phytosterols) are the plant counterparts of cholesterol. Taken with meals they reduce how much cholesterol the gut absorbs, and blood LDL cholesterol falls.
This is one of the most consistently replicated effects in nutrition research: a meta-analysis of 124 randomised studies found that 0.6 to 3.3 g a day lowered LDL by 6 to 12%, with the effect rising up to about 3 g a day and little added above that.
Sterols and stanols work at the same doses, and capsules and tablets lowered LDL as much as fortified spreads and drinks in a meta-analysis of eight supplement trials. The effect adds to statins: on top of statin therapy, enriched diets lowered LDL by a further 0.30 mmol/L in a meta-analysis of 15 trials.
The EU authorises a disease-risk claim that plant sterols and plant stanol esters lower blood cholesterol at 1.5 to 3 g a day, and requires foods with added sterols or stanols to say that more than 3 g a day should be avoided. The open question is outcomes.
A European Atherosclerosis Society panel stated in 2014 that no randomised trial with hard end-points has shown clinical benefit, a Cochrane review in familial hypercholesterolaemia found no outcome data at all, and a 2020 genetic study of almost a million people concluded that absorbed plant sterols may themselves contribute to atherosclerosis.
Plant sterols also lower blood beta-carotene and other carotenoids, by about 7 to 16% depending on the carotenoid. The evidence here is for the gram-dose cholesterol use. Beta-sitosterol at 60 to 130 mg a day for prostate symptoms has its own entry.
Taken with food, plant sterols and stanols significantly inhibit the absorption of cholesterol from the intestine, so less cholesterol reaches the blood and LDL cholesterol falls.
Blood and tissue levels of plant sterols and stanols stay 500 to 10,000 times lower than those of cholesterol, although an intake of 2 g a day does raise them.
EU labelling law requires these foods to state that patients on cholesterol-lowering medication should only use them under medical supervision. In trials the effect added to statins, so tell the clinician who manages your cholesterol.
EU labelling law requires these foods to state that they may not be nutritionally appropriate during pregnancy or breastfeeding. One small trial of stanol ester spread (about 1.1 g a day in 21 pregnant women) found no effect on gestation length or infant growth, but infant beta-carotene adjusted for cholesterol was lower at 1 month.
EU labelling law requires these foods to state that they may not be nutritionally appropriate for children under 5. A European Atherosclerosis Society panel considered them for children over 6 only when they have familial hypercholesterolaemia, so use them in a child or teenager only under the supervision of the specialist treating that condition.
EU labelling law requires these foods to state that they are intended exclusively for people who want to lower their blood cholesterol.
A Cochrane review found plant sterols lowered LDL compared with a cholesterol-lowering diet alone, but no trial measured heart disease or death. Use only alongside the treatment your specialist prescribes.
Tip: Eat fruit and vegetables regularly. Levels stayed within the normal range in the trials.
Plant Sterols & Stanols has an evidence score of 7/10 — strong evidence based on 15 indexed studies, including 9 meta-analyses. Plant sterols and stanols taken at about 2 to 3 g a day, usually in fortified foods or as capsules, lower LDL cholesterol by roughly 6 to 12% in more than a hundred randomised trials. No trial has tested whether they prevent heart attacks or strokes. Representative study: PMID 42275989.
The commonly studied dose of Plant Sterols & Stanols is 2 to 3 g a day of plant sterols or stanols, counted as free sterols or stanols, taken with meals. Most trials gave them in fortified foods such as spreads, yoghurt drinks and milk, and capsules or tablets worked as well. The EU disease-risk claim covers 1.5 to 3 g a day, and EU labelling law requires foods with added sterols or stanols to state that more than 3 g a day should be avoided. LDL lowering keeps rising up to about 3 g a day and little is gained above that. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
The best time to take Plant Sterols & Stanols is with meals. Take it with food. Plant sterols and stanols work by reducing the cholesterol absorbed in the gut, so the supplement trials gave them with the main meals, usually split two or three times a day.
Plant Sterols & Stanols is generally well-tolerated and considered safe for most healthy adults at recommended doses. The most commonly reported side effects are lower blood beta-carotene and other carotenoids. Use caution if any of these apply to you: Sitosterolaemia (phytosterolaemia), a rare inherited condition in which plant sterols are over-absorbed and atherosclerosis is markedly increased.
CoQ10
Likely helpsA lipid-soluble antioxidant central to mitochondrial energy production, with the strongest trial support for fertility/IVF outcomes and heart failure.
Red Yeast Rice
Likely helpsFermented rice containing natural statins that effectively lower LDL cholesterol — the original statin.
Berberine
Likely helpsActivates AMPK to regulate blood sugar, improve insulin sensitivity, and support lipid metabolism. Its only head-to-head trial with metformin cited here was a 36-person pilot, which does not show it can replace metformin.
Oat Beta-Glucan
Too few graded studiesThe viscous soluble fibre in oats and barley. About 3 g a day, mostly eaten in foods, lowers LDL cholesterol by about 0.2 to 0.27 mmol/L in several meta-analyses, but how well it works depends on the product, and a trial of beta-glucan tablets found no effect.
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Reviewed by Dr. Baher Al Hakim · Last reviewed October 2026 · evidence from 15 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.