Health topic

Blood Lipids

These are reviewed research connections, not a ranked list of remedies. An ingredient can appear here because evidence was uncertain, preclinical, or limited to a specific preparation and setting.

Ailment-to-evidence view

What the reviewed research points to

This order reflects the depth of the reviewed evidence, not which option works best or what anyone should take. Mixed and negative findings stay in the list because they can be more useful than a promising headline.

Deeper reviewed evidence Mixed or uncertain

Green tea

The LDL direction was positive but small, HDL did not change, and the pooled exposure mixed beverages with concentrated extracts.

Studied form
Green tea beverages and green tea extracts pooled together; concentrated extracts are a different exposure from brewed tea
Outcome
Fasting total, LDL, and HDL cholesterol
Evidence
Meta-analysis of randomized controlled trials
See the evidence and cautions →
Deeper reviewed evidence Mixed or uncertain

Garlic

Pooling 19 trials is useful, but effects were small and inconsistent across outcomes, and several pooled estimates had moderate or high heterogeneity.

Studied form
Various aged-garlic preparations taken by mouth; not culinary garlic, raw topical garlic, garlic mouthwash, or an isolated compound
Outcome
Systolic and diastolic blood pressure, total cholesterol, triglycerides, LDL cholesterol, and HDL cholesterol
Evidence
Systematic review and random-effects meta-analysis of 19 clinical trials
See the evidence and cautions →
How this order is calculated

Evidence syntheses come before individual randomized trials, which come before early human and preclinical work. Sample-size bands add a small amount. Positive, mixed, negative, and safety-only directions do not change the depth score. Study independence is not yet scored, so overlapping reviews must not be counted as separate confirmation.

Connected ingredients

What appears in the current evidence map

Source-linked records

2 reviewed records

Evidence synthesis Mixed or uncertain 19 trials; aggregate participant count not stated in the PubMed abstract

Aged-garlic trials show small, outcome-specific cardiometabolic signals

Across 19 trials of aged-garlic preparations, pooled results found small average reductions in systolic blood pressure and LDL cholesterol. The analysis did not find clear changes in diastolic pressure or HDL cholesterol, and the total-cholesterol result narrowly included no difference. The authors called for more high-quality trials. This is not evidence that eating garlic has the same effect or that an extract should replace prescribed care.

What was studied
Various aged-garlic preparations taken by mouth; not culinary garlic, raw topical garlic, garlic mouthwash, or an isolated compound
Setting
Mixed treatment settings
Why it ranks here
Pooling 19 trials is useful, but effects were small and inconsistent across outcomes, and several pooled estimates had moderate or high heterogeneity.
Limits and cautions
  • The PubMed abstract does not give the aggregate participant count, individual-trial quality details, adverse-event synthesis, or a preparation-by-preparation effect estimate.
  • The review combined various aged-garlic forms and populations; one extract, dose, or patient group cannot be assumed equivalent to another.
  • The pooled systolic-pressure and LDL changes were small on average, and the source does not establish their clinical importance for an individual person.
  • LDL heterogeneity was moderate, total-cholesterol heterogeneity was high, and several outcomes were null or borderline, so the findings are not a uniform cardiometabolic benefit.
  • A separate aged-garlic blood-pressure meta-analysis indexed under PMID 39437887 has been retracted and is excluded from this record.

This record is not a recommendation to use aged garlic for hypertension or dyslipidemia and does not support replacing prescribed blood-pressure or lipid treatment.

Evidence synthesis Mixed or uncertain 14 trials with 1,136 adults

Green tea and blood lipids: a small LDL change, no HDL change

Across fourteen trials, green tea beverages or extracts produced a small average drop in LDL cholesterol and no significant change in HDL cholesterol. Pooling drinks and extracts makes the result broad, but it also makes it harder to tell what a particular product would do. The size of the LDL change does not support presenting green tea as a replacement for indicated lipid treatment.

What was studied
Green tea beverages and green tea extracts pooled together; concentrated extracts are a different exposure from brewed tea
Setting
Mixed treatment settings
Why it ranks here
The LDL direction was positive but small, HDL did not change, and the pooled exposure mixed beverages with concentrated extracts.
Limits and cautions
  • The analysis pooled brewed green tea with concentrated extracts.
  • The average LDL change was small.
  • The review measured lipid markers, not heart attacks, strokes, or mortality.
  • The statistically null HDL result should not be converted into a benefit claim.
  • This older synthesis does not settle the distinct safety questions around concentrated green tea extracts.

Brewed tea and concentrated extract capsules do not share the same exposure or safety profile. This record does not recommend changing cholesterol medicine or using an extract as a substitute for care.