A powerful antioxidant, glutathione plays a crucial role in many aspects of health. It is naturally produced by the body and also found in certain foods. In this article, we’ll explain what glutathione is and which foods are the best natural sources of it.
What is glutathione?
Glutathione is an endogenous antioxidant, meaning it’s produced naturally by the liver. It is made up of three amino acids:
- glutamine
- glycine
- cysteine
What are its main functions?
One of the most well-known roles of glutathione is to help the body neutralize oxidative stress and fight free radicals, which contribute to premature cellular aging. In addition, glutathione boosts the effectiveness of other antioxidants, such as vitamin C and vitamin E. A vitamin C deficiency can also pose serious health risks.
Glutathione also helps the body detoxify by eliminating pollutants and toxins through the liver, whether they come from our environment or our diet.
Lastly, it strengthens the body's defenses against viruses and bacteria, enhancing its ability to fight off infections and invasions. By acting directly inside the cells, glutathione helps prevent the development of numerous chronic, degenerative, inflammatory, and autoimmune diseases.
How does glutathione change with age?
As we get older, our natural production of glutathione declines and our stores become depleted. This is a normal part of aging but can be accelerated by long-term use of medication or an unhealthy lifestyle. Smoking and alcohol consumption can also speed up this depletion process.
On the other hand, maintaining a healthy lifestyle and regularly eating glutathione-rich foods can significantly slow down this decline. Let’s take a look at the foods that contain the highest levels of glutathione.
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What Are the Best Natural Sources of Glutathione?
Fruits and Vegetables Rich in Antioxidants
Foods naturally high in glutathione are rich in the three amino acids that form this powerful antioxidant. Some of the best examples include asparagus, spinach, avocados, zucchini, red and green bell peppers, potatoes, and green beans. Beets are also excellent glutathione precursors, as are grapes, mangoes, and various types of cabbage.
To fully enjoy the benefits of glutathione, it’s best to eat fresh fruits (camu camu, acerola...) and lightly cooked vegetables, ideally not overprocessed, to prevent glutathione degradation.
Lean Proteins
Consuming 2 to 3 servings of high-quality lean protein per day helps the body produce more glutathione. Good sources include poultry, whey, dairy products, and yogurt. These are also great for prostate health—so no reason to skip them!
Spices
Spices can also help activate glutathione enzymes in the body. Incorporating spices like cinnamon, cumin, and cardamom into your diet may help restore optimal antioxidant levels.
Moreover, curcumin, the key active compound in turmeric extract, is considered one of the most effective natural ways to boost glutathione levels.
Vitamins
Vitamins and minerals are essential for glutathione production, as they play a central role in various biochemical reactions. Important contributors include magnesium, zinc, folates, and vitamins E, B2, B6, and B12.
There is also a clear synergy between the antioxidant properties of vitamin C and those of glutathione. Vitamin C—whether natural or synthetic—helps maintain glutathione levels in the body, while glutathione recycles oxidized forms of ascorbic acid.
A study even showed that taking 500 to 1000 mg of vitamin C daily over 13 weeks could increase glutathione levels by up to 18% in white blood cells and 17% in red blood cells.
To sustain high glutathione levels, a vitamin C–rich diet is recommended. Focus on citrus fruits, bell peppers, papayas, and strawberries, or consider a liposomal vitamin C supplement.
Sulfur-Rich Foods
Another effective way to boost your body’s glutathione levels is to eat enough sulfur-rich foods. This is because sulfur plays a direct role in the synthesis of glutathione. You’ll find this mineral in cruciferous vegetables like broccoli, Brussels sprouts, cauliflower, and watercress, as well as in garlic, shallots, and onions.
Foods high in dietary protein—such as beef, fish, and poultry—also contain significant amounts of sulfur.
Selenium-Rich Foods
Selenium is another essential mineral that works as a cofactor for glutathione, helping to optimize its effects. In fact, a study involving 45 adults with chronic kidney disease found that taking 200 mg of selenium daily for three months led to a significant increase in their glutathione peroxidase levels.
Selenium is especially abundant in the following foods:
- chicken breast
- eggs
- legumes
- nuts
- oat flakes
- brown rice and organ meats
Are Supplements a Good Option?
Yes, because the most effective way to quickly restore glutathione levels is with a course of liposomal glutathione, the most bioavailable form for the body. In addition, other supplements can also support the natural synthesis of glutathione. These include alpha-lipoic acid (100 to 200 mg daily), methylsulfonylmethane (MSM) at 500 mg three times a day, and milk thistle supplements rich in silymarin.
References :
- Deanna M. Minich, and Benjamin I. Brown - A Review of Dietary (Phyto)Nutrients for Glutathione Support - Nutrients - 2019 Sep ; 11(9): 2073.
- Robert F. Grimble - The effects of sulfur amino acid intake on immune function in humans - J Nutr - 2006 Jun ; 136(6 Suppl): 1660S-1665S.
- Kevin J Lenton, Alain T Sané, Hélène Therriault, André M Cantin, Hélène Payette, J Richard Wagner - Vitamin C augments lymphocyte glutathione in subjects with ascorbate deficiency - Am J Clin Nutr - 2003 Jan ; 77(1) : 189-95.
- Miguel Navarro-Alarcón, Carmen Cabrera-Vique - Selenium in food and the human body: a review - Sci Total Environ - 2008 Aug 1 - 400(1-3) : 115-41.
- D P Jones, R J Coates, E W Flagg, J W Eley, G Block, R S Greenberg, E W Gunter, B Jackson - Glutathione in foods listed in the National Cancer Institute's Health Habits and History Food Frequency Questionnaire - Nutr Cancer - 1992 ; 17(1):57-75.
- R Hanif, L Qiao , SJ Shiff , B Riga - Curcumin, a natural plant phenolic food additive, inhibits cell proliferation and induces cell cycle changes in colon adenocarcinoma cell lines by a prostaglandin-independent pathway - J Lab Clin Med -1997 Dec ; 130(6) : 576-84.
- IA Donat, Sardjoko , PN Vermeulen - Cytotoxic and cytoprotective activities of curcumin. Effects on paracetamol-induced cytotoxicity, lipid peroxidation and glutathione depletion in rat hepatocytes - Biochem Pharmacol - 1990 Jun 15 ; 39(12):1869-75.
- Saibal K Biswas, Danny McClure, Luis A Jimenez, Ian L Megson, Irfan Rahman - Curcumin induces glutathione biosynthesis and inhibits NF-kappaB activation and interleukin-8 release in alveolar epithelial cells: mechanism of free radical scavenging activity - Antioxid Redox Signal - Jan-Feb 2005 ; 7(1-2): 32-41.