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Anti-Aging and Cellular Protection: As a potent antioxidant, glutathione helps defend cells against oxidative damage, potentially improving skin elasticity, reducing the appearance of wrinkles, and supporting overall vitality

Papaioannou A, Liakopoulou A, Papoulis D, Gianni E, Gkolfi P, Zygouri E

Sci Adv 1

Improves Skin Texture, Elasticity, and Firmness By combating oxidative stress, glutathione supports healthy collagen production, improving skin elasticity and firmness, and provides additional benefits for smoother, firmer skin

Furthermore, O2 is produced during a sequence of events known as the respiratory burst that activated neutrophils go through (132)

The question you might be asking is, why B12 specifically