Phytosterols
Also known as: Plant sterols, Beta-sitosterol
Phytosterols, also called plant sterols and stanols, are compounds found in vegetable oils, nuts, and seeds and are commonly discussed alongside dietary approaches to lipid wellness. Because they compete with cholesterol for absorption, they can also reduce absorption of some fat-soluble nutrients such as carotenoids. Eating a varied diet with plenty of colorful produce, and spacing them from fat-soluble supplements, are commonly suggested to offset this.
Snapshot
Evidence level is outcome-specific; a supplement can have stronger evidence for one use and limited evidence for another.
What this page can tell you: Commonly discussed timing, food notes, caution categories, and an honest note on how much source review this entry still needs.
What it cannot: Whether this is appropriate for you personally, or that it treats, prevents, or cures any condition. Informational only — discuss with a clinician or pharmacist.
🕒 Timing
When: With a meal
Food: With food
Commonly taken with meals, since they act on absorption during eating.
💊 Common use range
1,500–3,000 mg
Doses are commonly discussed within a daily range; more is not necessarily better — verify and follow product guidance.
Ranges are informational, not a recommended dose. Talk to a professional about what is right for you.
⚠️ Commonly noted interactions (supplements)
Often about absorption or timing rather than danger — separating doses is common. This list is not exhaustive.
🧭 Baseline caution
General caution for ordinary, common use — before accounting for your specific dose, medications, health history, or procedures.
No general caution factors flagged for ordinary use. See context alerts below for situations that may still apply to you.
Caution level is an informational summary of commonly discussed caution categories and doses — not a safety rating, approval, or medical advice. Low caution does not mean safe for you.
🔎 Context alerts to review
Context alerts may matter depending on your dose, medications, health history, or procedure plans — they do not mean the supplement is generally risky at ordinary use.
Spacing & absorption
- May affect absorption of other supplements/medications taken together
🩺 Medication caution categories
None flagged here, but always review your full routine with a professional.
🏥 Surgery & procedure caution
Not a well-established surgical concern; share your full supplement list with your care team.
If you have a procedure scheduled, bring your full supplement list to your surgical and anesthesia team. Do not stop prescribed medication unless your clinician tells you to. Do not start or stop supplements based only on this app.
✅ Quality checklist
- Prefer products with third-party testing or a certificate of analysis (COA).
- Check the label for the exact form and the elemental or active amount per serving.
🧩 Commonly paired with
🔁 Alternatives
🗣️ Questions for a professional
- Do phytosterols fit with my current diet and any lipid-related plan my clinician has?
🔬 Evidence snapshot
Plant sterols and stanols carry an FDA-authorized health claim: as part of a diet low in saturated fat, they may reduce the risk of coronary heart disease. Meta-analyses show roughly an 8-10% LDL reduction at about 2 g/day, with little added effect above ~2.5 g/day. They are not a substitute for prescribed cholesterol medication.
🧪 Forms & quality
Needs evidence review — no source-reviewed information yet. We only show dose and monitoring details after they have been checked against reputable sources.
See the supplement glossary for what form names like "L-", chelated, or standardized extract mean.
📏 Dose & monitoring
Needs evidence review — no source-reviewed information yet. We only show dose and monitoring details after they have been checked against reputable sources.
Evidence vs. burden: Not yet reviewed
😐 Commonly reported side effects
- Digestive upset in some people
Non-exhaustive and individual.
🔄 Cycling & breaks
No established cycling pattern.
📅 Daily use notes
Because they can reduce absorption of fat-soluble nutrients like carotenoids, eat a varied diet and consider spacing them from fat-soluble supplements.
📋 Source review status
Source-reviewed — last reviewed 2026-07-11
Reconciled 2026-07-11 against plant-sterols-cholesterol-source-inventory.md (FDA 21 CFR 101.83 + PMC meta-analyses). Cautious lipid-support framing only — not a statin replacement; never stop or change prescribed medication.
📚 References
- FDA authorized health claim — plant sterol/stanol esters & CHD (21 CFR 101.83)FDA — Authorized claim: ≥1.3 g/day sterol esters (or ≥3.4 g/day stanol esters), in two daily servings with meals within a diet low in saturated fat and cholesterol, may reduce CHD risk.
- Meta-analysis — phytosterol dose-response on LDL (Demonty et al.)PubMed review — 59 RCTs; pooled LDL reduction −0.31 mmol/L; dose-response saturates above ~2.5 g/day (~2 g/day ≈ 8-10% LDL reduction).
Verified against the source shown. See the research-status page for how review works.
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