Glutathione of Skin Lightening and Whitening Agents: A Comprehensive Review of Mechanism, Efficacy and Safety.

Abstract

Glutathione is a Potential antioxidant and its reduced form ( GSH) has a good skin- Whitening effect in humans through its tyrosinase inhibitory activity. Glutathione is a available in topical, Oral and injectable formulation. Topical and Oral forms are Considered to be safe. Intravenous form did not prove its safety and efficacy to till date. Hyperpigmentary disorders, including melisma, are challenging to treat. Glutathione has anti-melanogenic and antioxidant properties, which led to its use as a skin-lightening agent. Glutathione is a low molecular weight Thiel-tripeptide that plays a prominent role in maintaining intracellular redox balance. In addition to its remarkable antioxidant properties, the discovery of its ant melanogenic properties has led to its promotion as a skin-lightening agent. This narrative review aims to evaluate the efficacy and safety of oral, topical,and intravenous glutathione in skin-lightening therapies:

Keywords

Introduction

Desire to attain skin tone lighter or fairer complexion in adults is  increasing day by day.  This craze exploiting the implication of topical skin Lightening agents and therapies containing hydroquinone, alpha and beta hydroxylases, tretinoin, arbutin,  VitaminC serum, soy extract.

Glutathione peptide is an antioxidant and is a Combinations of three amino acids glutamate, cystine, and glycine Which detoxifies xenobiotics. As a skin Lightening agents, glutathione inhibits tyrosinase enzymes which helps in synthesis of melanin. It also modifies the production of eumelanin ( produce dark brown colour), Leads to Lightening of skins The role of skin color in daily life is important, especially for women, as it may become one's charm. Its sociopsychological significance may exceed its biological function, even to the extent of causing cosmetic problems, resulting in lower quality of life and one's self-esteem. White-skinned individuals tan their skin, while dark skinned individuals seek various ways to brighten their skin. lighter skin tone has been considered a superior trait in most races, especially in women of Asian or African descent who have Fitzpatrick skin types IV–VI. Fair skin is a prevalent aesthetic and cultural preference, particularly in many regions of Asia and Africa. Products designed to achieve this are widely used, primarily aimed at minimizing hyperpigmentation, reducing dark spots, and achieving uniform skin tone. The concentration of Glutathione, a tripeptide (glutamic acid, glycine, and cysteine) is around 5 millimolar in most cells.[3] Glutathione exists in 2 forms in human body- reduced and oxidized. The ratio of oxidized and reduced Glutathione determines the redox status of the cell. The ratio is >100 in a healthy cell and it drops to 1 to 10 in cells exposed to oxidant stress.[4] The availability of Glutathione in body depends on three energy dependent processes which involves de novo synthesis, reduction of the oxidized form and then recycling of cysteine from conjugated Glutathione.[3] Reduced glutathione (GSH) is the main low-molecularweight thiol-containing tripeptide present in almost all living cells ranging from bacteria to mammals. It was discovered 130 years ago in baker's yeast (Saccharomyces cerevisiae). Initially named as “philothion,” many works have tried to establish and elucidate its pivotal role in aerobic life.[1] Glutathione exists in a reduced form (GSH) and an oxidized form (GSSG).Glutathione is available naturally in fresh leafy vegetables, Walnuts, Orange, Whey protein, tomatoes and fresh fruits. Glutathione is available in different formulation like topical, Oral and injectable. The major limitations of these studies included were small sample size consisting of healthy Volunteers, extremely short study periods with an even shorter follow- up and Lack of measurement of Blood Levels of Glutathione.The investigators also did not estimate baseline or post- treatment renal or thyroid function of the Subjects, both of which were reported to be adversely affected by IV glutathione. Glutathione is a ‘ magical skin Whitening ‘ molecules in Countries like the  republic of Philippines. Glutathione compared to placebo, with no adverse drugs effects. In India, Central Drug Standard Control Organization (CDSCO) has approved Glutathione for intravenous use in cases of alcoholic fatty liver, alcoholic liver fibrosis, alcoholic cirrhosis, and alcoholic hepatitis while Food and Drug Administration (FDA) The dose and duration of treatment by oral

Glutathione varied in all the three studies.[12], [13], [14] Because of its antioxidant properties, it is also being used by some dermatologists for allergic disorders of the skin like eczema. The main objective of the study was to analyze the usage pattern of Glutathione by dermatologists in India from their clinical experience.

BIOCHEMISTRY OF GLUTATHIONE _:

• Neutralizing reactive oxygen species ( ROS)
• Supporting detoxification pathways
• Regulating immune functions
• Protecting Cells from Oxidative stress 

Within skin physiology, glutathione supports cellular repair, maintain redox balance, and influences melanogenesis, which contributes to its proposed roles in skin- Lightening application.

UPDATE ON GLUTATIONE AS SKIN- LIGHTENING AGENTS : 

There were only few published studies that evaluated the efficacy of Oral, topical and parental glutathione as a skin Whitening agents. Two trails were conducted on oral GSH conducted in Thai population by Arjinpathana and in Filipino Women by Handogbet et al, 

 STRUCTURE:

Figure 1 : Structures  of Glutathione

PHARMACEUTICAL  FORMULATION OF GLUTATHIONE :

1. Oral Formulation :Available as Pills, Capsules, Lozenges, Solutions, Syrups and sprays. 
   1. 1. Liposomal Glutathione.
      2. Sublingual or Buccal Tablets.
      3. Stabilized Oral Forms.
2. Parenteral Preparations: Administered via injections to achieve rapids onset and higher therapeutics Levels in the Bloodstream. These includes : 
   1. 1. Intravenous injection s ( IV ):
      2. Intramuscular injections: 
      3. Lyophilized Powders for  Injections :
3. Topical Formulation: Applied directly to the skin for Localized effects, most commonly for Skin Lightening or anti- aging.
   1. 1. Creams, Lotions, Face washes, Soaps and Chemical Peels are available. 
4. Others Routes of Administrations :
   1. 1. Inhaled or Nebulized Solutions :
      2. Intranasal Formulations :
      3. Transdermal Patches or Films : 

MATERIALS AND METHODS:

A questionnaire-based study was conducted from October 2023- December 2023. The study protocol was approved by the Institutional Ethics Committee for Biomedical and Healthcare Research. Apart from the relevant demographic details, the responders were requested to answer a total of 16 questions. These questions were related to indications, administration, safety, and adverse events associated with Glutathione therapy. Data entry was done in Microsoft Excel and descriptive statistics was applied. Categorical data were analyzed by frequency and percentages while continuous data were represented as mean with standard deviation. After incorporation of their suggestions and approval,

validated questionnaire using Google form was circulated through WhatsApp to practicing dermatologists and post-graduate dermatology residents in India. This narrative review employed a two-stage selection process to ensure the inclusion of relevant and high-quality studies. In the first stage, titles and abstracts of articles retrieved from databases such as PubMed and Google Scholar were screened. The review included clinical trials, observational studies, and reviews investigating the use of glutathione for skin lightening. Priority was given to randomized controlled trials (RCTs), cohort studies, case-control studies, and systematic reviews. Review articles summarizing evidence from multiple studies on glutathione were also incorporated to offer a broader perspective on its efficacy and safety. Studies were restricted to human subjects utilizing glutathione for body skin lightening, irrespective of the route of administration (oral, intravenous, or topical). 

TOPICAL GLUTATHIONE:

Glutathione is commercially available as face washes and creams. A randomized, double-blind, placebo-controlled clinical trial conducted in 30 healthy Filipino women aged 30–50 years has provided some evidence favouring the efficacy of topical 2% GSSG lotion in temporary skin lightening. Patients were randomized to apply glutathione as 2% GSSG lotion and a placebo lotion in a split-face protocol, twice daily for ten weeks. GSSG was preferred over GSH, as GSH is unstable in aqueous solutions. GSSG eventually generates GSH after cutaneous absorption. The changes in the melanin index, moisture content of the stratum corneum, skin smoothness, skin elasticity and wrinkle formation were objectively assessed. The reduction of the melanin index with glutathione was statistically significant when compared to placebo [Table - 1].[10] Glutathione treated areas had significant improvement in other parameters as well. No adverse drug effects were reported. Glutathione has also become available in the form of soaps, face washes and creams.[18] Recently, a glutathione based chemical peel has been launched. Although evidence of efficacy is lacking, the manufacturers claim improvement of melasma, hyperpigmentation and skin ageing.[19

Biological activity: The glutathione redox cycle : Glutathione exists in two interconvertible forms, reduced glutathione (GSH) and oxidized glutathione (GSSG). GSH is the predominant intracellular form, which acts as a strong antioxidant and defends against toxic compounds and xenobiotics. In this process, GSH is constantly oxidized to GSSG by the enzyme glutathione peroxidase.To maintain the intracellular redox balance, GSH is replenished through the reduction GSSG by glutathione reductase enzyme.

Figure 2. The glutathione redox cycle, demonstrating the inter-conversion of oxidized and reduced glutathione

Figure:2

Figure 3. Summary of indications of glutathione, route of administration, and mechanism of action

RESULTS :

Efficacy of Glutathione Supplementation for Skin Lightening

Oral glutathione: Oral glutathione supplements have demonstrated mixed results in clinical studies, prompting further research to explore the effects of varying dosages, treatment durations, and individual factors [11]. A randomized, double-blind, placebo-controlled trial reported a significant reduction in melanin indices after four weeks of supplementation with 500 mg/day, particularly in sun-exposed areas [12]. However, Allen and Bradley reported no significant changes in melanin indices or oxidative stress biomarkers, emphasizing the variability in observed outcomes [13]. Scientists have investigated the potential of oral glutathione for overall skin lightening. In a randomized, double-blind, placebo-controlled trial, Arjinpathana and Asawanonda demonstrated that participants taking 500 mg of oral glutathione daily exhibited significantly lower melanin levels in sun-exposed areas, such as the face and wrists, compared to the control group [12]. These findings suggest that oral glutathione may be effective in lightening various skin types.

Wahab et al. demonstrated that the effectiveness of oral glutathione is enhanced when combined with other topical agents, the combined oral and topical use of topical glutathione produced more significant skin-lightening effects as compared to the use of a single agent [14]. Similarly, Duperray et al. found that 2400 mg of oral glutathione with 300 mg L-cystine resulted in significant improvement in lightening of facial skin, as well as significantly reduced dark spots [15]. This finding again supports the hypothesis that combination therapies will yield more synergistic mechanisms to help with the skin-lightening effect, but more studies are warranted to validate the synergistic effects of glutathione further [15].

Variability in outcomes across studies can be attributed to a range of factors, including demographic, genetic, and environmental differences, as highlighted by various studies [16,17]. Additionally, the dosage and duration of supplementation play critical roles in determining the extent of skin-lightening effects. Oral glutathione is generally well-tolerated, with reported side effects including transient gastrointestinal discomfort that typically resolves on its own [7,16]. Overall, oral glutathione shows promise as a systemic skin-lightening agent, particularly when optimized for dosage and duration or used alongside complementary therapies. However, more studies are needed to find the best ways to use it and to see if it has long-term effects.

CONCLUSIONS

The biological mechanisms of glutathione, combined with consumer demand for safer alternatives to conventional skin-lightening agents, have contributed to its increasing popularity for skin-lightening purposes. Various studies have demonstrated significant potential, particularly with oral and topical formulations. Oral supplementation has shown measurable, though sometimes inconsistent, skin-lightening effects and a favorable safety profile at standard dose levels. Topical formulations have been associated with significant improvements in hyperpigmentation and skin quality, with minimal and self-resolving side effects. In contrast, intravenous glutathione raises serious safety concerns, including the risk of anaphylaxis and hepatotoxicity, compounded by the lack of standardized protocols and rigorous clinical studies. These factors highlight that, while glutathione can be an effective skin-lightening agent, especially in its oral or topical forms. Additional large, well-designed clinical trials are needed to address critical gaps. These include long-term safety, optimal dosing, and the durability of its skin-lightening effects.

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