Campesterol (C28 Phytosterol · Cholesterol-lowering · Brassinosteroid Precursor)
| Compound | Campesterol (24-Methylcholesterol) |
| Chemical class | Terpenoid — Phytosterol (C28 plant sterol; 4-desmethyl sterol) |
| CAS | 474-62-4 |
| Primary source | Rapeseed/canola oil (Brassica napus), corn oil, wheat germ, sunflower oil; widely distributed in plant foods |
| Key applications | Cholesterol-lowering (phytosterol class); anti-inflammatory; plant brassinosteroid biosynthesis precursor |
| Claim strength | Moderate |
| Typical form | Natural phytosterol 95% blend (campesterol typically 20–30% of commercial phytosterol mixtures) |
| Buy from Herbuno | Natural Phytosterol 95% Powder → |
Name origin: From camphor (because it was first isolated from rapeseed oil = camphora-like oil in original European naming) + -sterol. Campesterol is a C28 phytosterol — the 24-methyl analogue of cholesterol, structurally intermediate between cholesterol (C27) and beta-sitosterol/stigmasterol (C29). It is the second most abundant phytosterol in most plant oils after beta-sitosterol, and a significant component of commercial phytosterol blends. Biosynthetic significance: Campesterol is a key intermediate in plant steroid hormone biosynthesis — the brassinosteroid pathway (brassinosteroids are plant steroid hormones regulating growth, photomorphogenesis, and stress responses) proceeds through campesterol. This positions campesterol as a plant hormone precursor in the same way that cholesterol is a precursor for human steroid hormones. Pharmacological profile: Campesterol shares the LDL-lowering mechanism with all dietary phytosterols (intestinal micelle competition with cholesterol). Its specific additional pharmacological properties include anti-inflammatory activity and potential modulation of immune cell function. Campesterol is also being researched for its role in the gut microbiome — specific gut bacteria can convert phytosterols including campesterol to bioactive metabolites with oestrogenic or anti-inflammatory activity. Commercial source: Herbuno’s Natural Phytosterol 95% blend delivers campesterol alongside beta-sitosterol and stigmasterol in commercial proportions.
Evidence for Campesterol Applications
Cholesterol-lowering — phytosterol class (High via class): As a dietary phytosterol, campesterol participates in the well-established LDL-lowering mechanism of phytosterol blends. Individual phytosterol contributions are not distinguished in most clinical trials (blends are used). Campesterol’s specific contribution depends on its fraction of the total phytosterol content. Claim strength: High (class); Moderate (campesterol-specific).
Anti-inflammatory: Campesterol inhibits NF-κB, reduces COX-2, and modulates macrophage activation in cell models. The anti-inflammatory activity is similar to beta-sitosterol and stigmasterol. Claim strength: Moderate.
Immune modulation: Some research implicates campesterol in modulation of T-cell and NK cell function. Elevated plasma campesterol has been associated with both protective and adverse immune effects in different study populations — suggesting complex dose-dependent immunomodulatory activity. Claim strength: Emerging.
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Frequently Asked Questions — Campesterol
Is campesterol the same as beta-sitosterol?
No — campesterol (C28, 24-methyl cholesterol) and beta-sitosterol (C29, 24-ethyl cholesterol) are structural relatives but distinct molecules. Campesterol has a methyl group at C-24; beta-sitosterol has an ethyl group. Both are dietary phytosterols sharing the LDL-lowering mechanism. Beta-sitosterol is more abundant in most plant sources; campesterol is particularly concentrated in rapeseed/canola oil (approximately 30–35% of total phytosterols). They are both present in commercial phytosterol blends and are co-responsible for the clinical LDL-lowering effect.
What are brassinosteroids and why does campesterol matter to them?
Brassinosteroids are plant steroid hormones essential for normal plant growth and development — regulating cell elongation, photomorphogenesis, vascular differentiation, seed germination, and stress tolerance. Campesterol is the entry point into the brassinosteroid biosynthetic pathway: campesterol → campestanol → 6-oxocampestanol → brassinolide (the most biologically active brassinosteroid). In this way, campesterol is to plants what cholesterol is to humans — the primary precursor for steroid hormone synthesis. Understanding this biosynthetic relationship is relevant to agricultural biotechnology (engineering brassinosteroid content for improved crop stress tolerance) and to the plant biology of phytosterol-containing botanical raw materials.
Does campesterol interact with hormone-sensitive conditions?
Campesterol and other phytosterols have very weak oestrogenic activity compared to isoflavones or phytoestrogens — far too weak to have clinical hormonal effects at normal dietary or supplemental doses. Gut bacteria can convert campesterol to minor oestrogenic metabolites (equol-like compounds) in some individuals, but these metabolite levels are generally clinically insignificant. The safety data for phytosterol supplementation (including FDA-reviewed evidence) do not indicate hormonal adverse effects in cancer patients or people with hormone-sensitive conditions at standard supplemental doses.
Can phytosterols including campesterol be used in pregnancy?
The safety of phytosterol supplementation (above dietary levels) in pregnancy has not been adequately studied. EFSA and SACN advise that phytosterol-enriched food products are not intended for use by pregnant or breastfeeding women as a precautionary measure — because phytosterols cross the placenta and their effects on foetal development at supplemental doses are not established. At normal dietary intake levels (from plant-rich diets), phytosterol consumption during pregnancy is standard and safe. The caution applies specifically to supplemental high-dose phytosterol formulations.
Related compounds: Stigmasterol, Beta-Sitosterol, Lupeol, Betulin
Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.
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