Glutathione is a little-known molecule that has become pivotal in advanced skincare. For those in the know, it is supposed to be the secret to younger-looking, flawless skin. It is widely available in over-the-counter products and comes in many forms. However, glutathione is not without its controversies or risks. In this guide we explore the role and benefits of glutathione for skin. We also compare it with other established anti-ageing and brightening ingredients, and review whether and how to add it to your routine.
What is Glutathione?
Glutathione is a naturally occurring antioxidant. This tripeptide is made up of cysteine, glutamic acid and glycine. In the body, it plays a vital role in reducing oxidative stress, supporting detoxification and maintaining cell health. These are all critical for keeping skin healthy and youthful.
Interestingly, glutathione was first discovered in 1888 by the biologist J. de Rey-Pailhade whilst studying a substance derived from yeast. Its chemical structure was only identified in 1921, by the scientist Frederick Gowland Hopkins. Historically, the uses of glutathione were mainly medical, based around its role in cellular defence and metabolism. It is used in conditions that involve oxidative stress, from Parkinson’s disease to chronic obstructive pulmonary disease, and some cancer protocols use it to protect healthy cells from the side effects of chemotherapy and radiation.
The skin benefits emerged as scientists explored the impact of oxidative stress and melanin production on skin health. They found that glutathione protects skin cells from oxidative damage and premature ageing caused by UV and pollution. Further research revealed its inhibitory effect on tyrosinase, an enzyme involved in melanin production, which highlighted its potential for hyperpigmentation and uneven tone. These findings led to glutathione being built into a range of anti-ageing and brightening products.
What are the Benefits of Glutathione for Skin?
The antioxidant properties of glutathione translate into several benefits for skin. The main ones are:
- Antioxidant Protection: Glutathione protects the skin from environmental damage by neutralising free radicals, which are key causes of premature ageing and dullness. Pollutants and UV induce oxidative stress, which breaks down the collagen and elastin that keep skin firm. By preventing this, glutathione helps protect against signs of ageing and maintain radiance.
- Evening Out Skin Tone: One of the most sought-after benefits is the ability of glutathione to regulate melanin. It inhibits tyrosinase, the enzyme that pigment-producing cells (melanocytes) use to make melanin. By reducing excess melanin, it helps fade hyperpigmentation and boost overall brightness.
- Anti-Ageing: Glutathione supports tissue repair and regeneration, which are crucial for elasticity. As skin ages, it makes less collagen and elastin, which leads to fine lines and a loss of firmness. By stimulating repair and new healthy cells, glutathione helps reduce fine lines whilst improving resilience and suppleness.
What Forms Does Glutathione Come In?
There are three main forms of glutathione, and they vary considerably in risk. This is also where most of the controversy lies:
- Injections: This is the fastest-acting and most potent route, but it carries serious risks including allergic reactions, infections, kidney or thyroid damage, toxicity and ochronosis. The main use of injectable glutathione is skin whitening, which raises real ethical concerns rooted in colourism and racist beauty standards. For these safety and ethical reasons, injectable glutathione has been subject to scrutiny and regulation in several countries.
- Oral: Oral supplements are supposed to raise the body’s glutathione levels for systemic antioxidant benefits. They are generally safer than injections but can cause stomach upset and, rarely, allergic reactions. Their absorption and effectiveness are also subjects of ongoing scientific debate.
- Topical: Creams and serums offer targeted benefits with minimal risk. There is a small chance of allergy or irritation, but this is rare with correct use. For these reasons, topical glutathione is the safest option and the one we focus on here.
How Does Glutathione Compare to Other Ingredients?
In skincare, glutathione has a unique position because it works as an antioxidant, an anti-ageing ingredient and a brightening treatment all at once.
Compared to other well-known antioxidants like vitamin C and vitamin E, glutathione stands out for its comprehensive cellular protection. Vitamin C is famous for brightening and boosting collagen, whilst vitamin E mainly shields the skin from environmental damage and works well with vitamin C. What sets glutathione apart is its ability to combat oxidative stress at a cellular level and influence melanin production. The good news is that you can use glutathione in tandem with other antioxidants, so they boost each other’s stability and benefits.
When it comes to anti-ageing and hyperpigmentation, glutathione also holds its own against the established players:
- Retinoids: Retinol and stronger forms like tretinoin are the gold standard in topical anti-ageing. They renew skin, treat acne and reduce hyperpigmentation, but they may cause irritation. Glutathione offers a gentler approach, so it may suit sensitive skin, and you can use both together.
- Exfoliating acids: Alpha-hydroxy acids and beta-hydroxy acids remove dead skin cells for a smoother, brighter complexion. They do not provide the pigment suppression and antioxidant benefits of glutathione, which is also gentler, but the two work well together.
- Kojic acid: This is a melanin inhibitor that is effective for hyperpigmentation. Glutathione works similarly to kojic acid but with a lower risk of irritation, so it may be better for sensitive skin.
- Hydroquinone: The gold standard for hyperpigmentation, hydroquinone is a prescription-only medicine that suppresses pigment production. It carries risks like irritation and ochronosis with prolonged use. Glutathione is a safer, gentler and slower alternative, and it works well for maintenance after a course of hydroquinone.
- Arbutin: This is a milder pigment inhibitor than hydroquinone. You can use glutathione alongside arbutin to enhance its effect whilst adding antioxidant benefits.
- Tranexamic acid: The big advantage of tranexamic acid is that it treats melasma with fewer side effects than other pigment suppressors. Glutathione complements it and adds antioxidant protection.
How Do You Use Glutathione in Your Skincare Routine?
We only recommend topical glutathione, since it is the safest form and widely available. Here are our top tips for adding it to your routine:
- Form: The best way to use glutathione is in a serum or cream.
- Step: Apply it after cleansing and toning, which lets the skin absorb it more effectively.
- Timing: Given its antioxidant properties, it is best used in the morning to combat the oxidative stress your skin faces during the day.
- Sunscreen: Always use a broad-spectrum sunscreen of at least SPF 30, even when it is grey or you are indoors. This matters especially when using glutathione or other pigment suppressors, to reduce the risk of rebound hyperpigmentation.
- Layering: Combining glutathione with antioxidants like vitamins C and E can amplify its benefits. You can also use it alongside retinoids and other pigment suppressors, in which case use glutathione in the mornings and those products in the evenings.
As always, patch test any new product first. If you have a stubborn skin concern or any skin conditions, check with a healthcare provider about which treatment is best for you.
Despite the debates around its risks, topical glutathione can play a useful role in anti-ageing skincare. It offers strong antioxidant protection for brighter, younger-looking skin, and it works best alongside other rejuvenating ingredients like antioxidants, retinoids and brightening agents. Just remember that nothing works overnight and everyone’s skin is different, so the best treatment is the one that addresses your individual needs and goals.
At City Skin Clinic, we are passionate about personalised skincare. Our online skin clinic offers safe and effective custom skincare treatments. Where appropriate our doctors use ingredients such as tretinoin and hydroquinone to treat skin conditions like acne, hyperpigmentation, melasma and skin ageing. To start your personalised skincare plan, book a virtual video consultation or use our online consultation form. The journey towards great skin starts here.
This article is intended for general informational purposes only and is not a substitute for medical advice, diagnosis or treatment. Always consult a qualified medical provider for any medical concerns or questions you might have.
