original glutathione injection Injections, 200mg/mL Glutathione Injection for Skin Whitening:

Instead, gently roll the glass between your fingers until the lyophilized powder is fully dissolved and the solution achieves complete optical clarity (displaying a vivid blue hue)

They're also used to form liposomes, or tiny self-assembling vesible used to stabilize actives like vitamin c or retinol

Sun K, Wu Z, Ji Y, Wu G

Its protection is not strong enough on its own but it is quite photostable (loses 10% of SPF protection in 95 mins) and is often used to stabilize other photo-unstable UV-filters , for example, Avobenzone

AL: Conceptualization, Investigation, Writing original draft, Writing review and editing