does glutathione lighten eyes can Can You Get Rid of Dark Circles Under Your Eyes Forever? Here's Glutathione Changed My Eye Color
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These findings suggest that for people taking high-dose B12 supplements , consuming them on an empty stomach might be beneficial
A., Gleiberman, L., Harburg, E., DiFranceisco, W., & Schork, A

Negative Modulation of the GABAA 1 Receptor Function by l -cysteine
doi: 10.1681/ASN.2009080795

That means we can deliver higher doses without the stomach upset that sometimes comes with oral supplements
Weeks 5-16: The ramp-up to efficacy During this phase, the dose is gradually increased every few weeks