glutathione brighten skin π IV Therapy for Whitening NOW Foods, Glutathione Skin Brightener,
Description
Once reconstituted, solutions require immediate refrigeration between 2C to 8C to maintain molecular integrity over subsequent experimental phases

Genetic and biochemical findings in Chinese children with Leigh syndrome
It helps a lot in some formulas and did very little in others (so the benefit really depends on the specific product)

However, keeping your collagen in its original tub or bag can be helpful
