The role of HDL (high-density lipoprotein) in gut health is not clearly established. HDL is best known for its cardioprotective effects via reverse cholesterol transport. Emerging, mostly mechanistic research suggests HDL may influence gut health through anti-inflammatory properties and by binding bacterial lipopolysaccharides, potentially supporting intestinal barrier integrity. However, these findings come primarily from in vitro or animal studies; robust human evidence is lacking. HDL is a complex biomarker – particle number and functionality may be more relevant than total HDL cholesterol. No direct causal link to gut health has been proven. Consumers should be cautious of tests that market HDL as a gut health indicator. Evidence grade: mechanistic/unclear. Safety note: HDL levels alone are not a valid measure of gut health; clinical interpretation is recommended.
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