Glutathione in Reproductive Health

Supriya Maharjan
She is an MBBS student at Kathmandu Medical College with a strong commitment to community service and leadership. Her experience as Vice-President of the Leo Club of Durbarmarg has been formative, where she organized and executed health initiatives, deepening her involvement in health camps, donation drives, and tutoring programs. She is also a member of the Global Surgical Simulation Network (GSSN), an organization dedicated to providing early surgical skills training. Her background includes service with Nepal Scouts and work as a freelance writer, contributing to websites covering both entertainment and sports. She is passionate about community building, social service, creative exploration, and research, she balances her medical studies with interests in reading, writing, and music.

Imagine a firecracker enclosed in a glass jar. As it burns, its sparks shoot off in all directions and hit the glass, until it cracks and topples over. Something similar occurs in our bodies. Our bodies create “free radicals,” unstable molecules formed as byproducts of stress, poor diet, pollution, and other factors. These free radicals can wreak havoc on our bodies.
Luckily, our bodies have a way to combat the harmful effects of free radicals; i.e., glutathione, a molecule made by our bodies, is called the “master antioxidant.” The antioxidant helps protect our cells from damage by free radicals.
Picture your cells as books in a library, and the free radicals are water dripping on the books.
We can assume glutathione to be the maintenance staff, who identify the leaks, patch them, mop up the water, and prevent the books from being damaged.
The glutathione particles are depleted as they neutralize free radicals, and are then recycled and reused. With increasing age, and as we engage in unhealthy behaviors, such as smoking or drinking, the levels of glutathione decrease, and it becomes increasingly important to boost glutathione levels by supplementing it.

You might be wondering, “Why is it so important for reproductive health?”
For reproductive health, let us focus on the ovaries, which are one of the organs in the body that are particularly susceptible to oxidative stress due to the free radicals that are generated during egg production.
The eggs themselves have the highest concentrations of glutathione of any cell in the body, which makes sense, given that eggs are our most precious and finite resource.

What are the effects of having low levels of glutathione?
Other than stating the obvious, let’s look at some research.
A study done on genetically engineered mice with only 23% of normal glutathione levels in their ovaries revealed some concerning results!
Compared to healthy mice, the mice with low glutathione levels had

1. Accelerated ovarian aging, with eggs disappearing rapidly,
2. Increased oxidative damage, and
3. Premature activation of eggs, which caused them to die.

It also showed that the ovaries were uniquely susceptible to the effects of decreased glutathione levels, as the other organs in the mice were far less affected.
Also, a study published in 2024 identified the granulosa cells (cells that surround and nourish the egg) as the site at which a deficiency of glutathione causes fertility issues.

When the granulosa cells were unable to produce glutathione,

1. The size of the follicles decreased, and
2. The quality of the eggs was compromised.
   While these results are compelling, and the evidence is growing, human studies are also being done.
   A study conducted on 85 women over the age of 38 in 2025-26 who showed diminished ovarian response revealed that glutathione supplementation (given intravenously during the IVF process) resulted in:
3. Lower oxidative stress, apoptosis, and hypoxia markers in follicular fluid and cumulus cells, and
4. Higher rates of mature eggs, fertilization, and blastocyst formation.

Glutathione supplementation improved oocyte survival and is therefore used in IVF, when eggs are removed from their protective environment, to facilitate fertilization.
Like two sides of the same coin, Glutathione also has its downsides.
Glutathione supplementation may also prevent cancer therapies from working, due to its antioxidant properties, which may be beneficial to cancer cells. Therefore, human clinical trials are still needed before glutathione can be recommended for use in cancer patients.
New developments in this field are being made, including the creation of new antioxidants.
Researchers discovered that glutathione selenium nanoparticles (GSH-Se) may be useful in protecting ovarian function, possibly more so than glutathione alone.

N-Acetylcysteine (NAC)
NAC is a glutathione precursor and has also been shown to have positive results. Research has shown that NAC supplementation can improve ovarian response during IVF in older women and can improve blastocyst quality.
The clinical applicability of these glutathione boosters needs to be explored further.

So, are there any side effects or precautions to be aware of?
Like many things in life, glutathione has its pros and cons. It usually doesn’t produce any major adverse effects, but some people may experience milder ones, such as

1. Nausea
2. Bloating, or
3. Muscle cramps.

Intravenous glutathione may cause severe allergic reactions, liver damage, and worsened asthma symptoms.
Long-term oral glutathione supplementation may lead to decreased zinc levels. So don’t just read the article and start supplementing yourself, talk to your doctor about the supplementation to understand more about its pros and cons.

The Bottom Line
Glutathione is your body’s maintenance crew; it helps clean up harmful molecules and protect your cells from damage.
The studies done on glutathione all point to one conclusion: that glutathione is essential in maintaining and protecting ovarian function, which in turn promotes female fertility.
The antioxidant helps prevent premature ovarian aging, supports egg and embryo quality, and helps maintain proper redox balance in the ovaries, which helps maintain normal ovarian function. The antioxidant also appears to help protect against the damaging effects of chemotherapy.
Future prospects look promising, with new antioxidants and glutathione precursors, such as NAC, that may help boost glutathione levels and, in turn, ovarian function.
If you want to learn more about glutathione and its effects, you should stay tuned to future developments in this field.
Attempts at maintaining your glutathione levels are one of the best things you can do for your body and your fertility.
However, like any powerful tool, it should be used wisely and with caution.

References:
1.Yurttancikmaz ET, Ozcan P, Tanoglu FB, et al. Protective Effect of Glutathione Administration on Ovarian Function in Female Rats with Cyclophosphamide-Induced Ovarian Damage. Gynecol Obstet Invest. 2024;89:120-130.
2.Lim J, Nakamura BN, Mohar I, Kavanagh TJ, Luderer U. Glutamate Cysteine Ligase Modifier Subunit (Gclm) Null Mice Have Increased Ovarian Oxidative Stress and Accelerated Age-Related Ovarian Failure. Endocrinology. 2015;156(9):3329-3343.
3.Cinco R, et al. Decreased glutathione synthesis in granulosa cells, but not oocytes, of growing follicles decreases fertility in mice. Biology of Reproduction. 2024.
4.Luderer U, et al. Gonadotropin regulation of glutathione synthesis in the rat ovary. Reprod Toxicol. 2001;15(5):495-504.
5.Knapen MF, et al. Glutathione and glutathione-related enzymes in reproduction. A review. Eur J Obstet Gynecol Reprod Biol. 1999;82(2):171-184.
6.Wu G, et al. The importance of glutathione in human disease. Biomed Pharmacother. 2003;57(3-4):145-155.
7.The antioxidant glutathione. Vitamins and Hormones. 2023.
8.Glutathione supplementation of two-phase CAPA-IVM system improves human oocytes maturation. 2026.
9.Glutathione: Role in Oxidative/Nitrosative Stress, Antioxidant Defense, and Treatments. 2021.
10.Exploring the Safety and Efficacy of Glutathione Supplementation for Skin Lightening: A Narrative Review. Cureus. 2025.
11.Forman HJ, Zhang H. Glutathione in Our Diet and Its Role in the Body: From Disease Prevention to Anti-Aging. Nutrients. 2026;18(10):1640. doi: 10.3390/nu18101640.