If your cat suffers from chronic digestive or gastrointestinal problems, oral B12 supplements are unlikely to help
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Jankovic A, Korac A, Srdic-Galic B, Buzadzic B, Otasevic V, Stancic A, et al
Its not inherently dangerous, but there isnt enough evidence to fully endorse it without caution
A 2016 study published in the International Journal of Molecular Sciences (PMC4881455) specifically compared two forms in melanocyte cell models: GSH reduced glutathione, the standard cosmetic form GSH-MEE glutathione monoethyl ester, a cell-penetrating derivative The conclusion: "GSH-MEE was effective for anti-melanogenesis, whereas GSH itself was not." The reason proposed: free GSH is polar and charged at physiological pH