Digest IT!

If you’ve been researching antioxidant supplements for gut or liver health, you’ve probably come across two names more than any others: alpha lipoic acid (ALA) and glutathione. Both are powerful. Both are well-studied. And the question of whether to take them together — and how — comes up constantly in my practice.

The short answer: yes, they work particularly well together. Here’s why.

What Is Alpha Lipoic Acid?

Alpha lipoic acid (ALA) is a sulphur-containing fatty acid that functions as both a fat-soluble and water-soluble antioxidant — a rare property that allows it to work in virtually every tissue and cell compartment in the body. It’s produced in small amounts by the body and found in trace quantities in foods like spinach, broccoli, and organ meats, but supplemental doses are far higher than what food provides.

What makes ALA particularly interesting is its role in the antioxidant network. ALA doesn’t just neutralise free radicals directly — it regenerates other depleted antioxidants, including vitamins C, E, and, critically, glutathione. This is the key to why the two are so often discussed together.

What Is Glutathione?

Glutathione is often called the “master antioxidant” — and for good reason. It’s produced in every cell, with the highest concentrations in the liver, where it plays a central role in detoxification: neutralising reactive oxygen species, conjugating toxins for excretion, and regenerating other antioxidants after they’ve done their work.

Glutathione is made from three amino acids: cysteine, glutamine, and glycine. Cysteine availability is typically the rate-limiting factor, which is why NAC (N-acetylcysteine) — a cysteine precursor — is commonly used to boost it.

Glutathione depletes significantly with age, chronic stress, poor sleep, alcohol consumption, NSAID use, and chronic illness. Low glutathione is associated with increased intestinal oxidative stress, gut lining damage, and impaired liver function.

How ALA and Glutathione Work Together

The synergy between ALA and glutathione operates through two main mechanisms:

1. ALA recycles oxidised glutathione — when glutathione neutralises a free radical, it becomes oxidised (GSSG). ALA helps convert it back to its active, reduced form (GSH), effectively extending glutathione’s functional lifespan
2. ALA upregulates glutathione synthesis — research shows that ALA stimulates the expression of glutamate-cysteine ligase, a key enzyme in glutathione production, increasing the body’s own production of the antioxidant

This means taking ALA alongside glutathione isn’t just additive — it may be multiplicative. ALA helps sustain the glutathione you’re supplementing, while also encouraging your cells to make more of their own.

Why This Matters for Gut Health

The gut lining is one of the most metabolically active — and oxidatively stressed — tissues in the body. Enterocytes (gut lining cells) turn over rapidly and are constantly exposed to reactive oxygen species generated during digestion, microbial interactions, and immune activity. Glutathione is the primary defence against this oxidative damage in the gut.

Low intestinal glutathione has been associated with:

• Increased intestinal permeability (“leaky gut”)
• Impaired mucosal immunity
• Worsened symptoms in IBD and IBS
• Slower mucosal recovery after injury or infection

ALA’s ability to reduce gut oxidative stress and support glutathione in the intestinal mucosa makes the combination particularly relevant if digestive health is your goal.

Forms and Bioavailability

Not all forms are equal:

• R-ALA vs S-ALA — Alpha lipoic acid occurs as two mirror-image forms. R-ALA is the biologically active form produced naturally; S-ALA is the synthetic counterpart found in most standard supplements. R-ALA has higher bioavailability and greater antioxidant activity. Look for “R-ALA” or “R-alpha lipoic acid” specifically
• Liposomal glutathione — Oral glutathione is poorly absorbed in its standard form because it’s broken down in the gut before reaching the bloodstream. Liposomal delivery significantly improves absorption, making it the preferred form for supplementation. Sublingual (under-the-tongue) glutathione is another effective option
• NAC as an alternative — Since NAC effectively raises intracellular glutathione levels (and is one of the best-absorbed precursors), taking NAC alongside R-ALA is a common and well-supported strategy

For a high-quality R-ALA supplement, Life Extension Super R-Lipoic Acid is a well-regarded option that uses the stabilised sodium R-lipoate form for better absorption.

Practical Considerations

• Take ALA on an empty stomach for best absorption (food, especially carbohydrates, can blunt the peak plasma concentration)
• ALA can lower blood glucose — people on diabetes medication should monitor accordingly and speak with their GP
• Start with lower doses of ALA (100–200mg R-ALA or 300–600mg racemic) to assess tolerance; some people experience nausea at higher doses taken without food
• Liposomal glutathione is best taken away from food