Ingredient or product comparison
Glutathione Skin Lightening Research: Clinical Trial Comparison
Before selecting a glutathione protocol, understanding trial-based efficacy data matters more than anecdotal testimonials. The table below compares published research on glutathione for skin lightening across different doses, durations, and administration rout
This source-based comparison does not add ratings or recommend a winner.
- Before selecting a glutathione protocol, understanding trial-based efficacy data matters more than anecdotal testimonials. The table below compares published research on glutathione for skin lightening across different doses, durations, and administration routes.
- Arjinpathana & Asawanonda (2012, Journal of Dermatological Treatment)
- 500mg oral daily
- 12 weeks
- −15.8% MI reduction (dorsal hand)
- None. Liver enzymes within normal range
- First placebo-controlled trial establishing oral efficacy at moderate dose
- Watanabe et al. (2014, Journal of Clinical Biochemistry and Nutrition)
- 250mg oral daily
- −12.3% MI reduction (forearm)
- Mild GI discomfort in 8% of subjects
- Lower dose showed effect but required longer timeline for clinical visibility
- Handog et al. (2016, International Journal of Dermatology)
- 500mg oral daily + 500mg vitamin C
- 8 weeks
- −22.7% MI reduction (malar cheek)
- None
- Co-supplementation with vitamin C enhanced melanin suppression rate
- Dilokthornsakul et al. (2019, Journal of Cosmetic Dermatology)
- 1000mg IV weekly
- 10 weeks
- −26.4% MI reduction (full face)
- Transient hypotension in 2 subjects during infusion
- IV route achieved faster results but requires clinical administration
- Sonthalia et al. (2018, Indian Dermatology Online Journal)
- 2% topical cream twice daily
- −4.7% MI reduction (forearm)
- Mild irritation in 5% of subjects
- Topical formulation showed minimal efficacy as monotherapy
- Weschawalit et al. (2017, Journal of Dietary Supplements)
- 500mg liposomal oral daily
- −19.2% MI reduction (dorsal forearm)
- Liposomal encapsulation improved oral bioavailability vs standard capsules
- The evidence consistently supports 500–1000mg oral doses sustained for 8–12 weeks minimum. IV administration accelerates results but isn't necessary for meaningful melanin suppression. Oral protocols reach comparable endpoints with extended timelines.