The State of Glutathione Research

Dr. Debby Hamilton, MD, MPH

Introduction

Glutathione is the primary antioxidant in the body and therefore has a significant role in controlling oxidative stress in the body. It is formed primarily within cells from three amino acids including cysteine, glycine, and glutamic acid.1 Because it is an antioxidant, it is available in a reduced active form of glutathione (GSH) that neutralizes free radicals and transforms into the oxidized glutathione disulfide form (GSSH). The oxidized form GSSH is then recycled back to the reduced form GSH. 

Benefits of Glutathione

While glutathione plays a key role in managing oxidative stress in the body it also serves multiple other functions. It helps recycle other antioxidants such as vitamin C and vitamin E. Oxidative stress can contribute to damage of tissues and cells down to the level of the mitochondria.  Mitochondria are critical for energy production in the body.  Glutathione is essential for protecting the mitochondria and therefore protecting energy formation.2

Detoxification is another critical function served by glutathione including both environmental toxins and endogenous metabolic toxins.3 With its critical role in detoxification, high levels of glutathione are found in the liver and other detoxification organs such as the kidney and lungs.4,5 Levels of glutathione can be depleted with ongoing exposure to toxins.

Glutathione serves a key role in immune function.  It is involved in increasing natural killer cells and enhancing T cell function.6-8 By increasing multiple types of immune cells, it supports both the innate and adaptive immune systems.  Research studies have shown increases in natural killer cell function with the supplementation of liposomal glutathione.7,9 

Conditions with Increased Glutathione Needs
As the major antioxidant in the body, glutathione is essential for human health. With chronic disease, there is an increase in inflammation and oxidative stress leading to an increased need for glutathione. Aging is associated with lower levels of glutathione and increasing levels of oxidative stress.10 Multiple types of infections have been associated with low levels of glutathione including viral infections such as COVID-19, influenza, and HIV.11-13   Chronic infections such as Borrelia infections which impact an increasing number of people are associated with low levels of glutathione.14

Neuroinflammation is involved in neurodegenerative diseases in adults such as dementia but also in children with autism spectrum disorder. Chronic neuroinflammation leads to depletion of glutathione.15,16 Chronic cardiovascular, lung and liver diseases have been shown to have low levels of glutathione which impact severity of disease.17-19

Issues with Glutathione Supplementation
Because glutathione is a critical antioxidant in the body, the question becomes how to best supplement. Glutathione can shift rapidly between the reduced and the oxidized state so when taken in a direct form orally it gets oxidized in the stomach, so the active form is not absorbed. The human gastrointestinal tract contains significant amounts of the enzyme GGT, which recycles GSH precursors. This may decrease GSH absorption significantly from oral glutathione supplementation.20 To protect glutathione, liposomes which are lipids surrounding the glutathione, have been developed. Intravenous (IV) glutathione is used by many practitioners in their practice but because of cost and time is difficult to do frequently long term. Transdermal, intranasal, and nebulized glutathione are other forms of supplementation but have less research and less availability.  Practitioners also use precursors for glutathione such as N-Acetylcysteine (NAC). Research on glutathione absorption and clinical outcomes are reviewed below to evaluate efficacy of different glutathione supplementation methods. In vivo studies will be the focus to show practitioners how to best support their patients with glutathione supplementation.

Research on Oral Glutathione
Initial research on supplementing oral glutathione was done with the reduced GSH form without any change in the molecule or added lipids in the form of a liposome. In 1992, researchers gave a single dose of 3 grams of GSH to seven people and did not observe an increase in blood GSH levels.21  A randomized double-blind placebo-controlled trial was done in 2011 that had 40 participants given 500 mg twice a day for four weeks.20  Oxidative stress markers were not reduced and there was no increase in total reduced, GSH, oxidized GSSH, or change in ratio of GSH/GSSH.20 Since there were no changes in glutathione or oxidative stress markers, oral glutathione in its unmodified form was not thought to be an option for glutathione supplementation. From these results, companies developed patented liposomal glutathione preparations. Several of these have been studied for absorption and/or clinical symptom improvement. One patented form of liposomal glutathione was researched for 6 months in a randomized controlled trial where half of the participants received a low dose 250 mg/day and half received a high dose of 1000 mg/day.9   Both doses showed increases in glutathione levels with the higher dose showing greater improvements. The high dose of 1000 mg after 6 months showed an increase in GSH (reduced active form) of 30-35% in red blood cells, plasma, and lymphocytes (P<0.05).9   For immune function, natural killer cytotoxicity was measured with a > two fold increase in the high dose group after 3 months (P < 0.05).9   For oxidative stress evaluation a decrease in oxidized to reduced glutathione ratios in whole blood were seen at the end of the study.

A different patented liposomal glutathione was investigated for absorption and immune function. Participants who had glutathione levels at the low end of normal received either 500 mg or 1000 mg daily for one month.7 There were no differences observed between dose groups at the end of the study. The maximum increases in glutathione levels were found after 2 weeks with 500 mg daily of 40% in whole blood, 25% in erythrocytes, 28% in plasma and 100% in PBMCs occurring after 2 weeks(P<0.05).7 Oxidative stress markers decreased significantly and correlated with the increase in glutathione levels. Immune markers showed improvement also with an increase in natural killer cell cytotoxicity up by 400% in two weeks and an increase in lymphocyte proliferation of 60% in two weeks where both reached statistical significance. (P<0.05).7

Research on Topical/Transdermal Glutathione
Topical or transdermal glutathione is an easy way to supplement glutathione, but the initial research did not support the efficacy of it. Research compared oral liposomal glutathione versus transdermal glutathione in children with autism spectrum disorder who had low baseline levels of glutathione.15  The study was conducted over 8 weeks and the doses of both the transdermal and the oral liposomal glutathione began at ¼ recommended dose and increased weekly until the full dose per weight was given at 4 weeks and that dose was maintained throughout the study.15 The children taking the oral glutathione had significant increases in plasma reduced glutathione along with elevated levels of sulfate, cysteine, and taurine.15(Kern).  In the transdermal glutathione group, there were also significant increases in plasma sulfate, cysteine, and taurine levels but not in plasma glutathione levels.15 The results lead to the concern whether transdermal glutathione was sufficient for raising plasma glutathione levels.

In a comparable manner to altering oral glutathione to increase absorption, a modified version of topical glutathione was developed called glutathione–cyclodextrin nanoparticle complex (GSH-CD) The research studied both absorption levels of the topical GSH-CD along with immune markers for three days when participants were exposed to Mycobacterium avium.22

Topical GSH-CD after three days showed elevated GSH levels in blood mononuclear cells and red blood cells along with decreased levels of the oxidative stress marker malandialdehyde.22   Immune elevations in cytokines and an increase in clearance of the Mycobacterium avium infection were associated with the topical GSH-CD.22  The study showed that a modified form of transdermal or topical glutathione could increase blood cell levels of glutathione which were not found with previous unmodified topical glutathione.

Research on Intravenous Glutathione
Initial research on intravenous (IV) glutathione showed that after an infusion of 2 gms. of glutathione the concentration of both total glutathione and cysteine in the plasma increased significantly.23 Excretion of glutathione in the 90 minutes following infusion increased 300 fold for glutathione and was at a constant rate with a half-life corresponding to 14.1 +/- 9.2 min.23 Subsequent research on intravenous glutathione has focused more on improvement in clinical symptoms than in vivo absorption studies.  Two studies done on Parkinson’s patients have shown clinical improvements with IV glutathione given daily for a month, but these clinical improvements returned to baseline after approximately two months without glutathione in both studies.24,25  Clinical studies have compared IV glutathione to oral N-acetylcysteine (NAC) for preventing oxidative stress after coronary angiography which induces oxidative stress damage.26 IV glutathione prevented the increase in oxidative stress markers as predicted but oral NAC had no effect on the oxidative stress markers.26  Based on the research, although limited, it appears that IV glutathione is effectively getting into the blood stream.  The concern is how long this effect lasts based on the short half-life.

Research on Nebulized and Intranasal Glutathione
Both intranasal and nebulized forms of glutathione are available and used primarily for sinus and lung conditions. Absorption studies are minimal. A safety study on intranasal glutathione  found it to be helpful for symptoms in 62% of patients with 12% reporting side effects.27 Intranasal glutathione is also being researched for neurodegenerative diseases with its close proximity to the nervous system. A study showed high dose intranasal glutathione to improve Parkinsons’s symptoms, but the results were not statistically significant.28

Efficacy of N-acetylcysteine (NAC) for Glutathione Support
N-acetylcysteine (NAC) is often used as a supplement to increase glutathione levels. Cysteine is the rate limiting step in glutathione synthesis so the thought is it would lead to an increased production of glutathione. One concern with this is the body’s ability to synthesize glutathione from cysteine and other amino acids decreases with age and with certain chronic diseases especially if they involve liver dysfunction.29 Genetic SNIPS’s including glutathione building and glutathione recycling enzymes can also influence the rate of glutathione production from precursors. Studies of NAC have been inconsistent with showing levels of increased glutathione.29-33   Since the benefits of glutathione include improving immune function and decreasing oxidative stress, NAC has been studied for both functions.  Research has shown in specific studies that NAC does not influence immune function.33 or antioxidant function.31 Overall, the research on NAC appears to be limited in terms of being a good method for improving glutathione and supporting multiple glutathione functions.

Summary
Glutathione as our primary antioxidant is critical for health. With the toxins in our environment along with high rates of chronic disease and stress, many people are low in this critical nutrient. Because of this, practitioners have searched for ways to elevate glutathione. There is research that shows improvement with targeted forms of oral glutathione in the liposomal form and modified topical glutathione (GSH-CD). Improvements in clinical function have been found with the liposomal oral form. Intravenous glutathione according to research is absorbed and can improve clinical symptoms but the concern is the short half-life and the return of symptoms once the IV glutathione has been stopped. Because of cost and needing to be in a clinical setting, IV glutathione is not practical for daily use. Intranasal glutathione and nebulized glutathione as methods for targeted disease states could be helpful but are not adequately researched at this time. Overall, more research needs to be done to understand how to maximize the supplementation of glutathione to benefit patients.

References

1. Zhang H, Forman HJ. Glutathione synthesis and its role in redox signaling. Semin Cell Dev Biol. 23:722–728.
2. Forman HJ. et al. Glutathione: overview of its protective roles, measurement, and biosynthesis. Mol Aspects Med. 2009;30(1-2):1-12.
3. Pastore A. et al. Analysis of glutathione: implication in redox and detoxification. Clin Chim Acta. 2003 Jul 1;333(1):19-39.
4. Yuan L. et al. Glutathione in liver disease and hepatotoxicity. Aspects of Med. 2009. 29-41.
5. Cantin A et al. Glutathione and Inflammatory Disorders of the lungs. 1991. 169:123-138.
6. Guerra C. et al. Glutathione and adaptive immune responses against mycobacterium tuberculosis infection in healthy and HIV infected individuals.  PLOS One. 2011.
7. Sinha R. et al. Oral supplementation with liposomal glutathione elevates body stores of glutathione and markers of immune function. Eur J Clin Nutr. 2018 Jan;72(1):105-111.
8. Morris G. et al. Redox regulation of the immune response. Cell Mol Immunol. 2022 Oct;19(10):1079-1101.
9. Richie JP Jr. et al. Randomized controlled trial of oral glutathione supplementation on body stores of glutathione. Eur J Nutr. 2015 Mar;54(2):251-63.
10. Maher P. et al. The effects of stress and aging on glutathione metabolism. Ageing Research Reviews. Vol 4(2).
11. Nencioni L. et al. Influenza A virus replication is dependent on an antioxidant pathway that involves GSH and Bcl-2. 2003;17:758–760.
12. Polonikov A. Endogenous deficiency of glutathione as the most likely cause of serious manifestations and death in patients with the novel coronavirus infection (COVID-19): A hypothesis based on literature data and own observations. ACS Infect. Dis. 2020;6:1558–156.
13. Ly J. et al. Liposomal Glutathione Supplementation Restores TH1 Cytokine Response to Mycobacterium Tuberculosis Infection in HIV-Infected Individuals.  Interferon. Cytokine Res. 2015;35:875–887.
14. Peacock BN. et al. New insights into Lyme disease. Redox Biology. 2015;5:66-70.
15. Kern JK. et al. A clinical trial of glutathione supplementation in autism spectrum disorders. Med Sci Monit. 2011;17(12):CR677-CR682.
16. Hauser RA. Et al. Randomized, double-blind, pilot evaluation of intravenous glutathione in Parkinson’s disease. Mov Disord. 2009 May 15;24(7):979-83.
17. Tan M. et al. Glutathione system enhancement for cardiac protection: pharmacological options against oxidative stress and ferroptosis. Cell Death Dis. 2023 Feb 16;14(2):131.
18. Ghezzi P. et al. Role of glutathione in immunity and inflammation in the lung. Int J Gen Med. 2011;4:105–113.
19. Bianchi G. et al.  Glutathione kinetics in normal man and in patients with liver cirrhosis.  Hepatol. 1997;26:606–613.
20. Allen J, Bradley RD. Effects of oral glutathione supplementation on systemic oxidative stress biomarkers in human volunteers. J Altern Complement Med. 2011;17(9):827-833.
21. Witschi A. et al. The systemic availability of oral glutathione. Eur J Clin Pharmacol. 1992;43:667–669. 
22. Sasaninia K. et al. Topical Absorption of Glutathione-Cyclodextrin Nanoparticle Complex in Healthy Human Subjects Improves Immune Response against Mycobacterium avium Antioxidants (Basel). 2023 Jul 2;12(7):1375.
23. Aebi S. et al. High-dose intravenous glutathione in man. Pharmacokinetics and effects on cyst(e)ine in plasma and urine. Eur J Clin Invest. 1991 Feb;21(1):103-10.
24. Hauser RA. Randomized, double-blind, pilot evaluation of intravenous glutathione in Parkinson’s disease. Mov Disord. 2009 May 15;24(7):979-83.
25. Sechi G. Reduced intravenous glutathione in the treatment of early Parkinson’s disease. Prog Neuropsychopharmacol Biol Psychiatry. 1996 Oct;20(7):1159-70.
26. Saitoh T. et al. Intravenous glutathione prevents renal oxidative stress after coronary angiography more effectively than oral N-acetylcysteine. Heart Vessels. 2011 Sep;26(5):465-72.
27. Mischley LK. et al. Safety survey of intransal glutathione.  The J Alt and Comp Medicine. 2013 19:5, 459-463.
28. Mischley LK. et al. Phase IIb Study of Intranasal Glutathione in Parkinson’s Disease. J Parkinsons Dis. 2017;7(2):289-299.
29. Schmitt B. et al. Effects of N-acetylcysteine, oral glutathione (GSH) and a novel sublingual form of GSH on oxidative stress markers: A comparative crossover study. Redox Biology6 (2015): 198-205.
30. Treitinger A. et al. Effect of N-acetyl-L-cysteine on lymphocyte apoptosis, lymphocyte viability, TNF-alpha and IL-8 in HIV-infected patients undergoing anti-retroviral treatment. Braz J Infect Dis. 2004 Oct;8(5):363-71.
31. Rushworth GF, Megson IL. Existing and potential therapeutic uses for N-acetylcysteine: the need for conversion to intracellular glutathione for antioxidant benefits. Pharmacol Ther. 2014 Feb;141(2):150-9. doi: 10.1016/j.pharmthera.2013.09.006. Epub 2013 Sep 28. PMID: 24080471.
32. Paschalis V, Theodorou AA, Margaritelis NV, Kyparos A, Nikolaidis MG. N-acetylcysteine supplementation increases exercise performance and reduces oxidative stress only in individuals with low levels of glutathione. Free Radic Biol Med. 2018 Feb 1;115:288-297. doi: 10.1016/j.freeradbiomed.2017.12.007. Epub 2017 Dec 9. PMID: 29233792.
33. Hamzeh N, Li L, Barkes B, Huang J, Canono B, Gillespie M, Maier L, Day B. The effect of an oral anti-oxidant, N-Acetyl-cysteine, on inflammatory and oxidative markers in pulmonary sarcoidosis. Respir Med. 2016 Mar;112:106-11. doi: 10.1016/j.rmed.2016.01.011. Epub 2016 Jan 22. PMID: 26831541.  

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10 Unusual Flu Remedies: Simple Ways To Boost Your Immunity And Speed Recovery

Dr. Isaac Eliaz | Jan 11, 2013

Flu season struck early this year: Experts say that it’s hitting especially hard with higher levels of flu activity and tougher viral strains. A strong immune system is the key to warding off annual flu bugs; and there are many ways to prime your defenses, including healthy diet, supplements, exercise and stress relief. If you do get sick, these unique natural flu remedies can help speed up recovery time and relieve uncomfortable symptoms.

Coconut Oil

This healthy fat is rich in a substance called lauric acid which provides many health benefits, including antiviral properties. Lauric acid is shown to directly interfere with the ability of viruses to replicate and spread, thus halting infection. Coconut oil also contains nutritional components that stimulate immunity, reduce inflammation and support other areas of health. Add 1 to 2 tablespoons per day to soups, salads and smoothies or even eat it straight.

Baking Soda

This simple compound, known as sodium bicarbonate, has long been used therapeutically for numerous medical conditions and first aid applications. It may fight against the flu by helping to neutralize acidity in the body, creating an inhospitable, alkaline environment for viruses and germs. When you start to feel the flu coming on or are exposed to a virus, begin by taking ½ teaspoon in water every two hours, six times throughout the day. Scale down two doses per day thereafter until symptoms subside.

Probiotics
There are hundreds of species of beneficial bacteria that reside in the digestive tract, assisting digestion, boosting nutrient assimilation and protecting against harmful microbes. Now, researchers are learning more about the direct relationship between probiotic bacteria, such as Lactobacillus and Bifidobacterium, and various aspects of the immune system. Studies show that probiotic bacteria can increase T cells, a critical class of immune responders. Other studies show that the probiotic strain Bacillus coagulans can increase immune responses to flu viruses, even swine flu. Find a comprehensive formula and follow dosage instructions, which can be increased during active flu symptoms.

Medicinal Mushrooms

Many species of medicinal mushrooms have been shown to help boost immunity and support overall health through multiple mechanisms of action. The varieties Coriolus, Reishi, Agaricus, Cordyceps, Umbellatus and Maitake are particularly helpful for flu protection and treatment. They contain an abundance of therapeutic compounds that boost the functions of immune cells, demonstrate potent antiviral activity, detoxify the body, reduce inflammation, support digestion and deliver powerful antioxidants. Medicinal mushrooms demonstrate an uncanny “intelligence” in the body and can actually help train the immune system to function more powerfully and efficiently. Look for an organically grown formula and follow instructions. Dosing can be increased during active illness and taken every few hours.

Laughter

Studies show that laughter can be a powerful immune booster. In addition to alleviating immune-suppressing stress, laughter is shown to increase NK (natural killer) cell activity and positively influence the expression of genes related to immunity. You don’t have to feel guilty about watching back-to-back comedies during the day when you’re at home with the flu.

Yoga

An ancient mind-body system of exercises, there are various methods of yoga practice. Studies show that certain yoga styles, such as Iyengar style and mindful meditation yoga, offer significant health benefits. Yoga can protect against stress, positively influence immune related-genes, boost circulation, reduce chronic inflammation and increase healing. Though the flu makes us feel tired and achy, yoga’s gentle movements and stretches help increase oxygenation and circulation, which are critical in fighting illness.

Sunshine

A daily dose of sunshine, about 15 to 20 minutes, can improve health by providing natural vitamin D3 to boost immunity, fight viruses and promote numerous aspects of overall health. If you live in an overcast area, consider a natural vitamin D3 supplement.

Music

Music therapy is commonly used to help address various aspects of health. Certain musical styles such as classical music have been well researched and shown to reduce stress, boost immunity, support metabolism and much more. Choose something you enjoy and try to practice deep breathing while listening.

Modified Citrus Pectin

This simple preparation, made from the white pith of citrus peels and modified for absorption and activity in the body, is shown to offer a powerful boost to immunity, particularly NK cell activity. It controls inflammation, fibrosis and cancer formation by blocking the harmful effects of excess galectin-3 in the body. Modified citrus pectin also safely removes immune-suppressing heavy metals, thus helping to protect against viruses and infections. Taking 5 to 10 grams of modified citrus pectin per day can offer a significant boost to immunity and help speed recovery, especially when taken together with medicinal mushrooms.

Avoid Sugar

Most sugars, particularly refined sugars, trigger a cascade of harmful reactions in the body that directly suppress immunity and feed harmful invaders. Choose sweeteners that do not spike glucose and cause the inflammatory cascade of immune-suppressing actions. Stevia and coconut sugar are excellent alternative sweeteners that do not weaken the immune system or fuel the replication of harmful viruses, bacteria and microbes.

This year, if you are thinking of getting a flu shot, consider natural immune boosters and healthy lifestyle habits as a first line of defense. These holistic approaches can not only protect against colds and flus, they help maintain overall health and longevity throughout the year and beyond. For more practical health and wellness information, visit www.dreliaz.org.

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Vitamin B3 may be the cure for drug-resistant superbug infections

Tuesday, September 04, 2012 by: Ethan A. Huff, staff writer - Natural News

While the pharmaceutical industry is busy trying to conjure up new drugs to tackle the antibiotic-resistant "superbug" epidemic, a recent study published in the Journal of Clinical Investigation explains how simple vitamin B3, also known as nicotinamide (NAM), taken in high doses may effectively thwart staph and other potentially life-threatening infections without the need for drugs.

Researchers from both Cedars-Sinai Medical Center in California and the Linus Pauling Institute (LPI) at Oregon State University (OSU) collaborated with one another to test the effects of high doses of NAM administered to both live mice and human blood infected with Staphylococcus aureus (S. aureus). What they found was that vitamin B3 significantly boosts the number and effectiveness of neutrophils, or white blood cells that target infections.

It turns out that, when taken in doses far higher than those recommended by the federal government, vitamin B3 is capable of significantly boosting the body's own natural immune system to the point where many diseases simply cannot survive. According to the study, vitamin B3 is capable of increasing immune capacity by 1,000 times, allowing the body to naturally fight MRSA and other deadly pathogens.

"This could give us a new way to treat staph infections that can be deadly," said Adrian Gombart, an associate professor at LPI, about the dramatic findings. "It's a way to tap into the power of the innate immune system and stimulate it to provide a more powerful and natural immune response."

NAM is not just effective against S. aureus, though. Several other virulent pathogens, including human immunodeficiency virus (HIV), also seem to respond favorably to NAM's dramatic immune-boosting capacity. By bolstering the immune system's natural defenses, NAM appears to facilitate the destruction and elimination of a host of deadly pathogens and viruses.

"NAM is not only effective against S. aureus, it also has demonstrated efficacy against other major human pathogens, such as K. pneumoniae (Klebsiella pneumoniae) and P. aeruginosa (Pseudomonas aeruginosa), in our human peripheral blood killing assay," wrote the authors in their discussion. "We have demonstrated that NAM, as an HDAC inhibitor, can improve host defense and thereby promote bacterial clearance."

And unlike antibiotic drugs, vitamin B3 does not destroy all the beneficial bacteria in the gut along with the harmful bacteria. So for most people, taking mega-doses of therapeutic vitamin B3 is preferable to taking immune-destroying antibiotics that can later promote the growth of Candida albicans and other harmful yeast overgrowths and bacterial imbalances within the body.

Sources for this article include:

http://www.jci.org/articles/view/62070?key=a39ce7efc2f764ede04

http://www.feedstuffs.com

http://www.foxnews.com