Plant Sterols
Naturally occurring compounds in plants that structurally resemble cholesterol and help lower LDL cholesterol by blocking its absorption.
Also known as: Phytosterols • Stanols
Overview
Plant sterols and stanols (phytosterols) are compounds found in the cell membranes of plants. Because they are structurally similar to human cholesterol, they compete with dietary and biliary cholesterol for absorption in the intestines. By blocking cholesterol absorption, they effectively lower blood levels of total and LDL ("bad") cholesterol. They are recognized by health authorities worldwide, including the FDA, as a proven method for cholesterol reduction.
Key Benefits
Lowers LDL Cholesterol
Clinically proven to reduce LDL cholesterol by 5-15% by inhibiting its absorption in the gut.
Works with Statins
Can be used in conjunction with statin medications for an additive cholesterol-lowering effect, as they work via different mechanisms.
Dosage & How to Take
The effective dose is 1.5-3 grams per day. Doses above this range do not appear to provide additional benefit.
| Purpose | Dose | Notes |
|---|---|---|
| Cholesterol Reduction | 2 grams/day | Should be divided and taken with meals throughout the day. |
Best Time to Take
Must be taken with meals, especially those that contain fat and cholesterol, to be effective.
With or Without Food
Yes, required for mechanism of action.
Forms & Bioavailability
| Form | Absorption | Best For | Notes |
|---|---|---|---|
| Sterol Esters | Good | Mixing into foods and softgels | This is the most common form used in supplements and fortified foods like margarine spreads. |
| Free Sterols | Lower | Powder applications | Less soluble and may be less effective than the esterified form. |
Side Effects & Safety
Common
- Mild digestive issues like bloating or diarrhea
Rare
- May slightly reduce the absorption of fat-soluble vitamins (A, D, E, K) and carotenoids. This is not usually clinically significant.
Contraindications
- Sitosterolemia (a rare genetic disorder)
Interactions
Both drugs block cholesterol absorption, so their effects may be additive.
Scientific Research
Cholesterol-lowering efficacy of plant sterols/stanols provided in capsule and tablet formats: a systematic review and meta-analysis
A meta-analysis confirmed that plant sterols/stanols in capsule/tablet form significantly reduce LDL-cholesterol.
Food Sources
Frequently Asked Questions
Medical Disclaimer
This content is for educational and informational purposes only and is not intended as medical advice. Always consult with a qualified healthcare professional before starting any supplement regimen, especially if you have pre-existing health conditions or are taking medications. The statements on this page have not been evaluated by the Food and Drug Administration.