Benefits
LDL cholesterol reductions reported by Cuban trials
Trials run mostly by one research institute in Havana reported that 5 to 20 mg a day lowered LDL cholesterol by roughly a fifth to a quarter, which put policosanol on a par with statins on paper. A pooled analysis of 22 trials found lower LDL overall, but the effect was larger in Cuban studies than elsewhere and did not rise with dose, and its authors called for more trials to confirm it.
Independent cholesterol trials did not replicate the Cuban results
When groups in Germany and Canada tested sugarcane policosanol, including the original Cuban material, LDL cholesterol fell no more than on placebo, even at 80 mg a day. A recent independent pooled comparison of 131 trials covering ten cholesterol-focused nutraceuticals found policosanol was the only one that did not lower LDL cholesterol.
Blood pressure: small reductions with caveats
A pooled analysis of nineteen trials reported systolic pressure about 3 mmHg lower and diastolic about 1.5 mmHg lower with policosanol, but the results varied widely from study to study. Much of the recent blood pressure research comes from one Korean-led program whose lead investigator is now based at the Raydel Research Institute, and several of its trials tested Raydel's own product.
HDL cholesterol rise reported in supplier-linked research
In a 12-week Japanese trial of 20 mg a day, HDL cholesterol ended about 9.5% higher than placebo, but only in the 15 policosanol and 17 placebo participants left after low-compliance participants were excluded, and LDL, total cholesterol and triglycerides did not differ over the trial. The lead author is based at the Raydel Research Institute, and the tablets were Raydel's product. The German and Canadian trials saw no HDL change.
Well tolerated at the doses studied
Across Cuban and independent trials, policosanol caused few side effects; the German dose-ranging trial saw no serious adverse events at up to 80 mg a day, and a pooled analysis judged it safer than the comparison treatments. Good tolerability is not the same as benefit, and it does not rescue the cholesterol claim.
Mechanism of action
A blend of very long chain plant alcohols
Policosanol is a mixture of primary alcohols 24 to 34 carbons long, refined from sugarcane wax. Octacosanol makes up about 60 to 70 percent of the Cuban specification, with triacontanol, hexacosanol and dotriacontanol as smaller parts. Other supplements may use different waxes and ratios.
Proposed brake on liver cholesterol synthesis
In rat liver cancer cells, policosanol cut cholesterol synthesis by up to about 30 percent without inhibiting HMG-CoA reductase directly; it activated AMP-kinase, which switches the enzyme down. Triacontanol, not octacosanol, reproduced the effect. This is cell work and has not been shown in people at supplement doses.
The authentic-product argument
Failed replications outside Cuba were often explained away as using non-Cuban mixtures. A Canadian crossover trial tested authentic Cuban sugarcane policosanol at 10 mg a day, and the German trial used Cuban sugarcane-derived material at up to 80 mg; in neither did blood lipids differ from placebo, so product source alone does not explain why the original results have not been reproduced.
HDL quality hypothesis
A Korean and Japanese research program proposes that policosanol makes HDL particles more antioxidant and less prone to glycation, and reports less oxidized LDL and VLDL. These measures are laboratory assays on trial blood samples and zebrafish, and they come largely from one supplier-linked research group.
Clinical trials
Randomized, double-blind, placebo-controlled trial of policosanol 5 mg/day for 12 weeks and then 10 mg/day for 12 weeks, from the Center of Natural Products at Havana's National Center for Scientific Research (Más R, Castaño G, Illnait J, Fernández L, Fernández J, Alemán C, Pontigas V, Lescay M 1999, Clin Pharmacol Ther 65(4):439-47, PMID 10223782).
437 patients with type II hypercholesterolemia and additional coronary risk factors, after 5 weeks on a standard lipid-lowering diet.
LDL cholesterol fell 18.2% on 5 mg and 25.6% on 10 mg, total cholesterol fell 13.0% and 17.4%, and HDL cholesterol rose 15.5% and 28.4%. The placebo group had 11 serious adverse events, 7 of them vascular, against none on policosanol. This is typical of the Cuban literature, and effects of this size have not been reproduced by researchers outside Cuba.
Multicenter randomized, double-blind, placebo-controlled trial of Cuban sugarcane-derived policosanol at 10, 20, 40 or 80 mg/day for 12 weeks (Berthold HK, Unverdorben S, Degenhardt R, Bulitta M, Gouni-Berthold I 2006, JAMA 295(19):2262-9, PMID 16705107).
143 patients in Germany with hypercholesterolemia or combined hyperlipidemia and LDL cholesterol of at least 150 mg/dL, after a 6-week placebo and diet run-in.
LDL cholesterol fell by no more than 10% from baseline in any group, no dose differed significantly from placebo, and there was no dose-response. Total, HDL and VLDL cholesterol, triglycerides, lipoprotein(a) and cholesterol ratios were also unchanged. Policosanol was well tolerated. The authors concluded that usual and high doses do not lower lipids beyond placebo.
Randomized, double-blind, placebo-controlled crossover trial of 10 mg/day Cuban sugarcane policosanol given in margarine under supervision for 28 days (Kassis AN, Jones PJ 2006, Am J Clin Nutr 84(5):1003-8, PMID 17093150).
21 otherwise healthy hypercholesterolemic volunteers, studied by a McGill University group in Canada.
Plasma total, LDL and HDL cholesterol and triglycerides did not differ between policosanol and placebo, and body weight was stable. Because the trial used authentic Cuban material, it undercuts the argument that earlier failed replications simply used the wrong product. It was small and short.
Meta-analysis of randomized controlled trials of sugarcane policosanol in dyslipidemia, searching 11 databases (Gong J, Qin X, Yuan F, et al. 2018, Mol Nutr Food Res 62(1), PMID 28730734).
22 studies with 1,886 participants, from Cuba and other countries.
Pooled results favored policosanol for total and LDL cholesterol and for raising HDL cholesterol, while triglycerides and body weight were unchanged. Heterogeneity was high, Cuban studies showed larger effects than studies from elsewhere, and the effect was not proportional to dose, so the authors said more trials are needed to confirm efficacy.
Random-effects network meta-analysis of randomized trials of ten nutraceuticals marketed for LDL lowering, searched to February 2021 (Osadnik T, Goławski M, Lewandowski P, et al. 2022, Pharmacol Res 183:106402, PMID 35988871).
131 trials with 13,062 adults testing artichoke, berberine, bergamot, garlic, green tea extract, plant sterols and stanols, policosanols, red yeast rice, silymarin or spirulina.
Every nutraceutical except policosanols lowered LDL and total cholesterol more than placebo or no intervention, with bergamot and red yeast rice ranking highest. The authors concluded that policosanols have no effect on the lipid profile. It is the broadest independent comparison cited on this page.