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Marker · Ranges for learning, not a diagnosis

Liver enzymes

Also called ALT, AST, GGT.

Enzymes that leak into the blood when liver cells are under stress. GGT also rises with alcohol and with problems in the bile ducts.

Read this first

  • Coach, not doctor. Aaron Cuha is a coach, not a doctor. No medical credential is claimed for him, or for these pages. A number on a blood test is something to talk over with a doctor, not something to diagnose yourself with. Nothing here is a prescription, a plan to follow, or a reason to start or stop a medicine. Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.
  • Knowledge stays free. Knowledge stays free. Every page, every guide and every tool is free to read and stays free. No partner paid for a place on these pages.
  • Three kinds of lab page, kept apart. /bloodwork is blood tests for people. /testing and /prices/labs are lab tests on peptide vials. /supplements/quality is what is in the bottle.

Why a longevity audience asks

The owner's NAC rule waits on raised liver enzymes. High-dose green tea extract has a known liver risk. This is for keeping watch, not a detox plan.

How a coach reads it

Labs print their own upper limits. One small bump is not a diagnosis. ALT or AST that stays high, or any yellowing of the skin or eyes (jaundice), needs a doctor that same week, not a NAC shopping trip.

Units on this page: U/L

When it is low

Low values are rarely a target.

When it is high

Means the liver is under strain, or a muscle is leaking AST. Alcohol, viruses, medicines, fat in the liver and some supplements can all do it. NAC is a prescription drug for paracetamol (Tylenol) overdose. That evidence does not automatically carry over to a wellness capsule.

Easy ways to misread it

  • AST is also found in muscle. A hard workout can raise it.
  • Do not start a new liver support stack because of a high GGT. Stop alcohol and see a doctor.

What to ask your doctor

Ask for ALT, AST, GGT and alkaline phosphatase. Bring your list of bottles, including teas and fat burner capsules.

Related supplements

The ranges on this page are labeled as a doctor's ranges or the owner's. They are not a trial result made up for the page. The related compound pages show the trials.