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Anthocyanins

What does the research say about Anthocyanins?

4 health outcomes synthesised

Anthocyanins, a class of flavonoids found in berries and other colorful plants, have been studied for their potential effects on cardiometabolic health. Research syntheses covering 4 health outcomes show the strongest evidence for reducing hemoglobin A1c (HbA1c), based on 4 studies in people with type 2 diabetes, with a median effective dose of 320 mg/day typically producing moderate reductions (0.3–0.5%) after 8 weeks or more. Evidence for cholesterol and triglyceride outcomes is weaker and mixed.

Strongest evidence: The research area with the highest evidence strength is reduced hemoglobin A1c (moderate evidence). All 4 studies found beneficial effects, with moderate effect sizes most common. In people with type 2 diabetes, median doses of 320 mg/day were associated with HbA1c reductions of approximately 0.3–0.5%, typically observed after 56 days or longer.

Mixed or weaker evidence: Three other outcomes have low evidence strength. For reduced LDL cholesterol, all 3 studies reported benefits, but heterogeneity was high (I² = 85.2%), and the evidence base is small. For reduced blood cholesterol, findings are mixed: 2 of 4 studies (both large meta-analyses) reported beneficial effects, while 2 clinical trials found no significant effect. For reduced triglyceride levels, 2 of 3 studies showed small beneficial effects, but 1 recent RCT found no effect, suggesting population-specific results.

Effective dose patterns: Across outcomes with beneficial findings, a dose of 320 mg/day appears most commonly studied. This dose was associated with effects on HbA1c, LDL cholesterol, and triglycerides, though for blood cholesterol the only neutral studies used this dose. Duration of treatment ranged from 8 to 24 weeks (median 112–168 days) across outcomes.

Population insights: The most consistent benefits were seen in people with type 2 diabetes for HbA1c and (to a lesser extent) triglycerides. For LDL cholesterol, studies included older adults (aged 60–80) with mild cognitive impairment or cardiometabolic disorders, as well as mixed populations.

Notable caveats: The evidence base is small for all outcomes (3–4 studies each). Publication bias is a concern for HbA1c and LDL cholesterol outcomes, as null results are less likely to be published. Heterogeneity was high in the meta-analyses for LDL cholesterol and total cholesterol. Many studies did not specify the form of anthocyanins used, limiting conclusions about dose-form relationships.

Frequently asked

  • What is Anthocyanins good for according to research?
    Research on anthocyanins has focused on cardiometabolic health. The strongest evidence supports a moderate benefit for reducing hemoglobin A1c in people with type 2 diabetes (4 studies, all beneficial). There is also low-strength evidence for reducing LDL cholesterol (3 studies, all beneficial) and mixed evidence for total cholesterol and triglycerides.
  • What dose of Anthocyanins is typically used in studies?
    The most common dose studied across outcomes is 320 mg per day. For HbA1c reduction, doses around 320 mg/day produced moderate effects after 8 weeks or more. For LDL cholesterol and triglycerides, the same dose was used, though effects took up to 24 weeks to appear.
  • Who benefits most from Anthocyanins?
    The most consistent benefits are seen in people with type 2 diabetes, especially for lowering HbA1c and triglycerides. For LDL cholesterol, studies included older adults (aged 60–80) with mild cognitive impairment or cardiometabolic disorders, as well as mixed healthy and clinical populations.
  • Are there caveats or limitations in the research on Anthocyanins?
    Yes. The evidence base is small (3–4 studies per outcome). Publication bias is likely for HbA1c and LDL cholesterol outcomes, meaning null results may be underreported. Heterogeneity was high in meta-analyses for LDL and total cholesterol, and many studies did not specify the form of anthocyanins used, limiting dose-form insights.
  • Does Anthocyanins help with reducing LDL cholesterol?
    All 3 studies found beneficial effects on LDL cholesterol, with effect sizes ranging from small to moderate. The largest meta-analysis (32 RCTs, 1491 participants) reported a moderate effect. However, evidence strength is low due to a small number of studies and high heterogeneity (I² = 85.2%).
  • Is the evidence for Anthocyanins on blood cholesterol consistent?
    No, the evidence is mixed. Two large meta-analyses showed beneficial effects on total cholesterol, but two clinical trials in older adults with mild cognitive impairment and in type 2 diabetes found no significant effect. The beneficial meta-analysis had high heterogeneity (I² = 86.9%), indicating variability across studies.

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