Best Supplements for Liver Support

The liver carries out hundreds of metabolic and processing functions, and certain nutrients are studied for supporting its healthy function and the body's natural antioxidant defenses. Research suggests that milk thistle (silymarin), glutathione, and N-Acetyl-Cysteine each play distinct roles in supporting healthy liver function and glutathione status. FormulaForge ranks every ingredient by the bioavailability of its available forms so you can select the most effective options.

Updated 2026 · Reviewed by Dr. Brennan Commerford, D.C.

Frequently Asked Questions

What supplements may support healthy liver function?

Milk thistle (standardized for silymarin), glutathione, and N-Acetyl-Cysteine (NAC) are among the most studied ingredients for supporting healthy liver function and the body's natural antioxidant systems. These supplements are not intended to diagnose, treat, cure, or prevent any liver disease. Consult a qualified healthcare provider for any liver-health concerns or before combining supplements with medications.

Does milk thistle support healthy liver function?

Milk thistle is standardized for silymarin, a group of compounds studied for supporting healthy liver function. A systematic review with meta-analysis (Tao et al. 2017; PMID 28785154) examined the effect of silymarin on biochemical indicators in patients with liver conditions. Research suggests silymarin may support healthy liver function as part of a balanced routine. These are structure/function observations — milk thistle is not a treatment for any liver disease.

What is glutathione and how is it studied for liver support?

Glutathione is the body's primary intracellular antioxidant and plays a central role in the liver's natural metabolic-processing pathways. A randomized controlled trial of oral glutathione supplementation (Richie et al. 2015; PMID 24791752) reported that daily oral glutathione was associated with increased body stores of glutathione versus placebo. Research suggests supporting healthy glutathione status may support the body's natural antioxidant defenses. These are structure/function claims only.

How does N-Acetyl-Cysteine (NAC) relate to glutathione?

N-Acetyl-Cysteine is a precursor that the body uses to synthesize glutathione. A review of NAC's mechanism of action (Pedre et al. 2021; PMID 34171332) describes its role in supporting cysteine availability and glutathione synthesis. Research suggests NAC may support healthy glutathione status and the body's antioxidant capacity. These are structure/function observations — NAC is not a treatment for any condition, and it can interact with medications, so discuss it with your healthcare provider before use.