What is HDL?
HDL cholesterol (HDL-C) is carried by high-density lipoprotein particles, which transport cholesterol away from tissues and arteries back to the liver for removal. Higher HDL is associated with lower cardiovascular risk, though very high levels do not add benefit and the relationship is more complex than once thought.
Why it matters
HDL participates in reverse cholesterol transport and has anti-inflammatory effects. Low HDL is a recognized cardiovascular risk factor and a component of metabolic syndrome.
What it measures
The cholesterol content of HDL particles, reported in a standard lipid panel.
Reference & optimal ranges
Reference ranges vary by lab, assay, age, and sex. The ranges below reflect commonly published adult intervals and are for education only always interpret results with the range printed on your own lab report and a clinician.
Moderately high HDL is generally favorable, though very high HDL does not confer extra protection and may occasionally reflect other issues.
Common symptoms
- None
Potential causes
- Regular exercise
- Moderate alcohol (not recommended to start for this reason)
- Genetics
- Estrogen
Low HDL is a cardiovascular risk factor, often clustering with insulin resistance and high triglycerides.
Common symptoms
- None directly
Potential causes
- Insulin resistance / metabolic syndrome
- Sedentary lifestyle
- Smoking
- High refined-carb diet
- Genetics
- Obesity
How to improve your HDL
Lifestyle
Quit smoking
Smoking lowers HDL; quitting raises it.
Nutrition
Healthy fats, fewer refined carbs
Olive oil, nuts, and fatty fish support HDL; excess refined carbohydrate lowers it.
Exercise
Aerobic exercise
Regular cardio is one of the most reliable ways to raise HDL.
Sleep
General health
Supports overall metabolic health.
Frequently asked questions
Scientific references
- HDL: The 'Good' Cholesterol MedlinePlus, U.S. National Library of Medicine
- Cholesterol Levels Testing.com
Educational information, not medical advice. This page is for general education and does not replace diagnosis or treatment by a licensed clinician. Do not start, stop, or change any medication, supplement, or treatment based on this content. Reference and optimal ranges vary between laboratories interpret your results with the range on your own report and a qualified professional.