glutathione serums No.5+ Vitamin Concentrated Serum 000ppm of Niacinamide that brightens the skin by inhibiting the movement of melanin. Glutathione Serum

Sourcing and sterility

Sinclairs Dosage: 800-1000 mg taken at night

Standard application involves 1 mL of solution or half a capful of foam applied to dry scalp twice daily for men, once daily for women using 5% concentration

Lets look at each of them in detail: Vitamin C is one of the most well-researched brightening ingredients available, and this serum uses gel trap technology that delivers it 4x deeper into the skin than regular Vitamin C serums

Asian J Androl 16:3138

doi: 10.3389/fcell.2025.1598924 Received 24 March 2025 Accepted 07 July 2025 Published 18 July 2025 Volume 13 - 2025 Edited by Junqi Huang, Jinan University, China Reviewed by Anna Martina Battaglia, Magna Grcia University of Catanzaro, Italy Cadiele Oliana Reichert, University of So Paulo, Brazil Updates Copyright 2025 Fan, Xu, Gao, Zhang, Wang, Shan, Luo, Fei and Cai