Substrate ·evidence-based
interventions / Zinc / heart health

Does Zinc help heart health? (Grade B evidence)

Grade B for Zinc on heart health: the balance of RCT evidence favours a benefit, especially in adults with cardiometabolic risk factors, at moderate certainty, at doses varies across trials.

Exact question reviewed

Population
adults with cardiometabolic risk factors
Intervention
Zinc · varies across trials
Comparator
not reported
Outcome
heart health
Time horizon
not reported

Bottom line. Grade B for Zinc on heart health: the balance of RCT evidence favours a benefit, especially in adults with cardiometabolic risk factors, at moderate certainty, at doses varies across trials. [1 RCT]

Direction
benefit
Magnitude
GRADE-assessed meta-analysis of 75 studies: zinc supplementation significantly lowered several cardiometabolic risk markers — triglycerides, total cholesterol, fasting blood glucose, HbA1c, insulin resistance (HOMA-IR), and inflammatory markers (CRP, IL-6, TNF-alpha). A broad risk-factor signal across many biomarkers, not a demonstrated reduction in cardiovascular events.
Grade
B
Certainty
moderate
Clinical meaning
small but potentially useful
Who it applies to
adults with cardiometabolic risk factors
Dose / form studied
varies across trials
Safety
not assessed
The one limitation
Claim-specific limitation details are not available in this public record.

Reviewed · Evidence last changed · Claim clm_ec_b8-zinc-heart v0

Grade
B
what does the grade mean?
Certainty
moderate
what does certainty mean?

Grade B / moderate: probably helps, and new studies are unlikely to reverse this — but could shrink the effect size.

Who it works for

Best-studied in adults with cardiometabolic risk factors. Recorded studied dose: varies across trials.

Evidence

StudyDesignRoleCite
Zinc supplementation and cardiovascular disease risk factors: A GRADE-assessed systematic review and dose-response meta-analysis.peer-reviewedsupportsPMID:37399684

Why this grade

Reasoning trace

The current record stores Grade B at moderate certainty and links 1 publishable source. A claim-specific domain-by-domain grading rationale is not available in this public record, so no reason for upgrading or downgrading is inferred here.

Audit and version

Claim ID
ec_b8-zinc-heart
Claim version
not reported
Governance
legacy, not verified
Last evidence search
not reported
Last editorial review
2026-07-16T16:40:43.312Z

Public receipt · Machine-readable claim · Methodology

Dose & form

Studied intake: varies across trials.

How it stacks up for heart health

Grade history

No grade changes yet. Initial grade assigned; re-reviewed on every 12 months (Grade A/B) — next review by . Methodology v1.

Re-review cadence: every 12 months (Grade A/B) · next scheduled by · methodology v1.

Frequently asked

How long does Zinc take to work for heart health?

Trials of Zinc for heart health typically report effects within 2–4 weeks, though individual response varies. Studies rarely find benefit inside 1 week for chronic outcomes.

What dose was used in studies of Zinc for heart health?

Studied doses for Zinc in heart health trials cluster around varies across trials. See the dose block for the specific range and how it varies by form.

Does Zinc work for heart health if I'm not deficient?

The effect concentrates in adults with cardiometabolic risk factors. If your baseline is normal, expect a smaller effect than the trial averages.

Zinc or the next-best alternative for heart health?

See the compare block above for the head-to-head with the most-cited alternative. Grade + certainty differences matter more than any single trial.

Related

What this is — and is not

Evidence description
GRADE-assessed meta-analysis of 75 studies: zinc supplementation significantly lowered several cardiometabolic risk markers — triglycerides, total cholesterol, fasting blood glucose, HbA1c, insulin resistance (HOMA-IR), and inflammatory markers (CRP, IL-6, TNF-alpha). A broad risk-factor signal across many biomarkers, not a demonstrated reduction in cardiovascular events.
Substrate's interpretation
The current reviewed record assigns Grade B at moderate certainty. A domain-by-domain rationale is shown only when recorded.
Discuss with a clinician
If you're on medication or have a condition that changes the calculus, bring the interaction & population blocks above to your pharmacist or prescriber before deciding.
Individualized medical advice
Not provided here or on any Substrate surface (API, agent tool, embed) — see YMYL policy.

Cite this page

Citation is encouraged. The proposed reuse license is CC-BY-4.0; status: pending-governance-ratification.

Plain-text citation
Substrate. Does Zinc help heart health? (Grade B). https://evidencebased.info/interventions/zinc/heart-health. Updated 2026-07-16.
BibTeX
@misc{substrate_tionszinchearthealth,
  author = {Substrate editorial},
  title  = {Does Zinc help heart health?},
  year   = {2026},
  url    = {https://evidencebased.info/interventions/zinc/heart-health},
  note   = {Grade B, evidencebased.info}
}

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