Glutathione

Glutathione — is a tripeptide composed of glutamate, cysteine, and glycine, playing a key role in the antioxidant protection of the body. It is involved in neutralizing free radicals, detoxification, regulation of immune function, and maintaining cellular metabolism.

Reduction in glutathione levels is associated with aging, chronic diseases, and stress, making its regular replenishment through diet or nutraceutical support important.

Health Benefits

• neutralizes free radicals and reduces oxidative stress;
• supports liver health by participating in the elimination of toxins and heavy metals;
• regulates immune system function;
• ensures cell repair and DNA synthesis;
• participates in the metabolism of fats and carbohydrates.

Daily Requirement and Sources

The body synthesizes glutathione independently; however, amino acids are required for this: cysteine, glycine, and glutamate.

Supporting glutathione synthesis can be aided by:

• meat, fish, eggs, legumes, nuts (sources of amino acids);
• broccoli, garlic, onion, spinach (sources of sulfur-containing compounds);
• N-acetylcysteine (NAC), alpha-lipoic acid, selenium, vitamins C and E (supporting the antioxidant cycle);
• supplements with liposomal or reduced glutathione.

Possible forms and their absorption

Nutrient forms are listed from best to worst:

Liposomal glutathione. Has the best bioavailability — protected from degradation in the gastrointestinal tract and easily penetrates cells. Effectively increases the level of glutathione in the blood and tissues, especially during intoxications, chronic inflammation, and fatigue.

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iHerb

Codeage, Liposomal Glutathione, 1,000 mg, 60 Capsules (500 mg per Capsule)

≈ $49.81

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iHerb

Aurora Nutrascience, Mega-Pack+®, Liposomal Glutathione, 10 Packets, 0.68 fl oz (20 ml) Each

≈ $21.12

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iHerb

Aurora Nutrascience, Nano-Liposomal®, Glutathione, Liposomal Drink Mix, 750 mg, 30 Packets, 0.32 oz (9 g) Each

≈ $59.80

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iHerb

Aurora Nutrascience, Micro-Pack+®, Liposomal Glutathione , 10 Packets, 0.46 fl oz (13.5 ml) Each

≈ $18.84

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iHerb

Aurora Nutrascience, Nano-Liposomal®, Glutathione, Liposomal Drink Mix, 750 mg , 10 Packets, 0.32 oz (9 g) Each

≈ $17.09

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iHerb

Dr. Mercola, Liposomal Glutathione, 350 mg, 60 Capsules (175 mg per Capsule)

≈ $48.97

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iHerb

Micro Ingredients, Liposomal Glutathione Complex, 120 Vegetarian Capsules

≈ $35.11

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iHerb

Nutricost, Liposomal Glutathione, 60 Capsules (360 mg per Capsule)

≈ $27.22

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iHerb

Seeking Health, Liposomal Glutathione, Mint, 4 fl oz (120 ml)

≈ $43.11

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iHerb

Seeking Health, Liposomal Glutathione, Tropical, 4 fl oz (120 ml)

≈ $43.07

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Sublingual glutathione. Absorbed through the oral mucosa, partially bypassing the gastrointestinal tract and liver. Works faster and milder than regular capsules, but is less stable than the liposomal form.

Glutathione. Has low bioavailability — most of it is destroyed in the intestine. It may be useful at high doses or when taken with enhancing substances, but overall it is less effective.

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iHerb

Carlson, Glutathione Booster®, 180 Capsules

≈ $56.66

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iHerb

Nutricost, Glutathione, 500 mg, 240 Capsules

≈ $64.13

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iHerb

NOW Foods, Glutathione, 250 mg, 60 Veg Capsules

≈ $17.39

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iHerb

NOW Foods, Glutathione, 500 mg, 120 Veg Capsules

≈ $52.21

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iHerb

NOW Foods, Glutathione, 250 mg, 120 Veg Capsules

≈ $30.78

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iHerb

Source Naturals, Reduced Glutathione, 250 mg, 60 Tablets

≈ $21.50

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iHerb

Source Naturals, Reduced Glutathione Complex, Orange , 50 mg, 100 Lozenges

≈ $15.86

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iHerb

Super Nutrition, Super Immune, Immune-Strengthening Multivitamin with Glutathione, 60 Tablets

≈ $18.20

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iHerb

Swanson, L-Glutathione, 100 mg, 100 Capsules

≈ $15.48

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iHerb

Toniiq, Glutathione, 1,000 mg, 120 Capsules (500 mg Per Capsule)

≈ $34.70

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N-acetylcysteine (NAC). Not glutathione directly, but it powerfully stimulates its production in the body. Often preferred due to better absorption and deeper action.

Symptoms and Consequences of Deficiency

• fatigue, reduced energy and physical endurance;
• increased susceptibility to infections;
• worsening liver and detoxification function;
• increased risk of neurodegenerative diseases;
• worsening skin condition and tissue repair processes.

Possible Risks of Excess and Their Manifestations

Although glutathione is considered safe when synthesized endogenously, excess from prolonged high-dose supplementation may cause:

• imbalance of other antioxidants (vitamin C, vitamin E);
• suppression of certain components of the immune response;
• gastrointestinal disorders (rarely — in cases of overdose);
• reduced effectiveness of liver enzymatic systems.

Do not exceed the recommended limit of 500–1000 mg/day in supplement form without indications. It is better to focus on improving synthesis through diet and lifestyle.

What determines glutathione status

Glutathione is made from glutamate, cysteine and glycine. Adequate protein, sulfur amino acids, magnesium, selenium, riboflavin and liver function all matter for its synthesis.

Supplements may be useful in selected cases, but they do not replace sleep, alcohol control, lower toxic load, inflammation treatment and correction of deficiencies.

Keto and LCHF

A low-carb diet with enough protein, eggs, fish, meat, green vegetables and minerals may support endogenous glutathione production. Very aggressive calorie restriction and low protein can weaken antioxidant defenses instead.