Plant sterols (phytosterols) are steroid compounds found in plant cell membranes, with structures highly similar to cholesterol. Common plant sterols include β-sitosterol, campesterol, and stigmasterol.
The core mechanism by which plant sterols lower cholesterol is "competitive inhibition." In the intestine, plant sterols compete with cholesterol for binding sites in mixed micelles, reducing cholesterol absorption. Additionally, plant sterols upregulate hepatic LDL receptor expression, accelerating the clearance of LDL-C from the blood.
Extensive meta-analyses confirm that daily intake of 2g plant sterols reduces LDL-C ("bad cholesterol") by approximately 10%, with no significant impact on HDL-C ("good cholesterol") or triglycerides. This effect is significant in both individuals with normal and high cholesterol levels. The US FDA, European EFSA, and China's National Health Commission have all approved health claims for plant sterols regarding "cholesterol reduction."
Sources of phytosterols include vegetable oils (corn oil, soybean oil), nuts, seeds, and whole grains. Functional medicine products commonly use two forms: free phytosterols and phytosterol esters (bound to fatty acids for better lipid solubility). Phytosterol esters have slightly higher bioavailability than free phytosterols, but both are equally effective at lowering LDL-C.
Dynas Group (Hong Kong) offers a cardiovascular support formula (plant sterols + red yeast rice + garlic extract + CoQ100) in its Immune Resilience Series, available as custom capsules and softgels. The formulation follows a comprehensive cardiovascular support strategy: inhibiting cholesterol absorption, regulating synthesis, and providing antioxidant protection.
