Evaluation the effects of red yeast rice in combination with statin on lipid profile and inflammatory indices; a randomized clinical trial | BMC Nutrition

Linda Rider

Supplied the detrimental effects of dyslipidemia and in light of sure restrictions to statin use, this randomized medical demo (RCT) sought to assess the outcomes of crimson yeast rice (RYR) in individuals with dyslipidemia currently on statin remedy. We identified that RYR, together with statin remedy, can appreciably lower complete cholesterol amounts devoid of adversely affecting liver enzymes concentrations (AST, ALT).

Various meta-analyses have verified the potent romance among LDL degrees and the risk of cardiovascular illness (CVD) [18]. Just one meta-assessment by the Cholesterol Cure Trialists’ (CTT) Collaboration worked on data from 14 RCTs and about 90,000 topics. The examine instructed that as the serum level of LDL-C falls, the chance of CVD decreases accordingly [19]. A different CTT meta-investigation on a lot more than 170,000 patients discovered that just about every time the LDL concentration drops by one particular mmol/L, the chance of ischemic stroke, coronary artery disorder, and revascularization drops by over a single-fifth [20]. Simply because of the advantages of LDL-C reduction, lipid-lowering brokers – primarily statins – are extremely well known.

Not long ago, RYR has acquired acceptance as an substitute LDL-decreasing agent with couple of adverse results [21]. Several meta-analyses have confirmed the outcome of RYR on the reduction of LDL-C. Just one the latest review worked on 20 RCTs and 6663 people it showed that after 2 months to 2 yrs of treatment, RYR diminished the serum LDL-C degree by 1.02 mmol/l (~ 39.4 mg/dl) (with 95% self-confidence) in comparison with the placebo, indicating significant efficacy very similar to that of reduced-depth or small-dose statins (pravastatin 40 mg, simvastatin 10 mg, lovastatin 20 mg). The researchers also verified a slight boost in HDL-C and an insignificant lower in TG [14]. A different examine confirmed that clients acquiring RYR seasoned considerable decrements in serum LDL-C (23.%) and whole cholesterol (15.5%) levels relative to a command group next a sixteen-week treatment interval (P < 0.001) [22]. The lipid-lowering effect of RYR is believed to be due to the presence of monacolin K, which possesses the same structure as lovastatin [23]. It is thought that RYR limits the rate of hepatic cholesterol production by inhibiting the 3-hydroxy-3-methyl-glutaryl-CoA (HMG-CoA) reductase enzyme [17].

One consideration in the use of novel lipid-lowering agents is hepatotoxicity. A meta-analysis of seven trials [16, 24,25,26,27,28,29] assessed serum AST levels before and after intervention with RYR. The researchers showed that although the serum AST level were considerably higher in those who received RYR relative to controls, they remained within the normal range (0–40 U/L) [Total WMD = 1.55 (95% CI: 0.26, 2.84) U/L, I2 = 0%, P = 0.02, 7 trials (8 comparisons), n = 443]. Our study found that after 1 month of treatment, the serum AST level was only slightly higher in the intervention group than the placebo group (P = 0.074) and remained within the normal range. In the mentioned trials [16, 24,25,26,27,28,29], the serum ALT levels was significantly higher in the intervention group compared with the placebo group but again remained within the normal range (0–40 U/L) [Total WMD = 1.47 (95% CI: 0.42, 2.51) U/L, I2 = 0%, P = 0.006, 7 trials (8 comparisons), n = 443]. At the end of our study, the ALT level was also negligibly higher in the intervention group relative to the placebo group (P = 0.714) and remained within the normal range.

Another important aspect related to RYR is that it may improve endothelial function. In one study, 50 coronary heart disease patients randomly received either RYR (1200 mg daily, containing 11.4 mg of monacolin K) or a placebo, and the serum hs-CRP concentration was monitored. After 6 weeks, those receiving RYR experienced reductions in hs-CRP (P < 0.001) [30]. However, in our study, changes in hs-CRP levels after 4 weeks of intervention were not significant compared with the placebo (P = 0.78).

Although some recent studies only worked on the effect of RYR in isolation on LDL-C, our study investigated the effect of RYR when accompanied by another statin (atorvastatin or rosuvastatin) on both total cholesterol and LDL-C levels. Due to our limited sample size, further large-scale studies seem warranted. Another limitation was the significant differences in baseline total cholesterol and LDL levels between the study groups. Although the study was randomized, this may be due to the small sample size. We also measured the effect of RYR with only a one-month follow-up future studies should consider an extended period of follow-up.


Although in this randomized trial, we showed that use of RYR is sfae with statin, this need further larger trials to show the effect of RYS on lipid profile.

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