Table 2.
Name | Mechanisms of Action | Main Lipid-Lowering Component(s) | Effects on Lipids | Safety and Tolerability |
---|---|---|---|---|
Artichoke leaf extract | Inhibition of liver cholesterol synthesis via action on HMG-CoAR; effects on sterol regulatory element binding protein and acyl-CoA acyl transferase (ACAT) | Luteolin | Up to 10% reduction in LDL-C; small reduction in TG | Transient minor GI effects |
Bergamot | Inhibition of liver cholesterol synthesis via inhibition of HMG-CoAR and ACAT; may also increase fecal cholesterol excretion and reduce intestinal cholesterol absorption of bile acids | Brutieridin, melitidin, neoeriocitrin | Up to 15% reduction in LDL-C; small reduction in TG | |
Rice bran oil | Inhibition of liver cholesterol synthesis via inhibition of HMG-CoAR; reduction in intestinal cholesterol absorption | Gamma-oryzanol | 0.18 mmol/L (7 mg/dL) reduction in LDL-C across 11 RCTs (p < 0.001) | No known side effects |
Garlic | Inhibition of liver cholesterol synthesis via inhibition of HMG-CoAR, squalene mono-oxygenase, and acetyl-CoA synthetase; may also promote bile acid excretion | Allicin | Up to 5% reduction in LDL-C | Minimal, mostly GI side effects |
Green tea extracts | Antioxidant effects; may also interfere with cholesterol absorption and inhibitcholesterol synthesis via inhibition of HMG-CoAR | Catechins, including epigallocatechin-3-gallate | Up to 5% reduction in LDL-C | Potential iron and folate deficiency with high doses; rare GI side effects, rash, transient elevation of BP |
Vitamin B5 derivatives | Inhibition of fatty acid and cholesterol synthesis | Pantethine | Up to 11% reduction in LDL-C; smaller reductions in TG and total cholesterol | Well tolerated |
Omega-3 | Reduced VLDL and TG synthesis; increased fatty acid oxidation | Docosahexaenoic acid; eicosapentaenoic acid | 25–30% reduction in TG levels; variable effects on LDL-C depending on components | Well tolerated, rare abdominal discomfort; fishy aftertaste |
Coptis, Hydrastis, and Berberis spp. | Increased LDL-C excretion via increased expression of hepatic LDL receptors via inhibition of PCSK9 | Berberine | ~15% reduction in LDL-C; smallreduction in TG | Mild-to-moderate GI effects |
Lupin | Unclear; multiple proposed mechanisms | Bioactive peptides; isoflavones | 12% reduction in LDL-C; increase in HDL-C in some studies | Well tolerated; minor GI events |
Soy | Unclear; multiple proposed mechanisms | Bioactive peptides; isoflavones | Up to 5% reduction in LDL-C; small reduction in TG and increase in HDL-C | Long-term use of high doses may disrupt fertility and thyroid function; may reduce absorption of calcium and other minerals |
Turmeric | Unclear; multiple proposed mechanisms | Curcumin | Inconsistent effects reported; some studies report significant improvements in LDL-C, TG, and HDL-C | Well tolerated |
BP = blood pressure; GI = gastrointestinal; HDL-C = high-density lipoprotein cholesterol; LDL-C = low-density lipoprotein cholesterol; PCSK9 = proprotein convertase subtilistin/kexin type 9; RCTs = randomized controlled trials; TG = triglycerides; VLDL = very low-density lipoprotein.