It depends on your body and how low your B12 levels were
Glutathione is naturally produced by the liver and plays a key role in cellular repair, immune function, and the neutralization of harmful free radicals
Pogribna M, Melnyk S, Pogribny I, Chango A, Yi P, James SJ: Homocysteine metabolism in children with Down syndrome: in vitro modulation
Dec 2008;59 Suppl 6:81-113
10, May 2007, pp
When Supplements May Be the Better Option Supplements may be more suitable when someone has no symptoms, wants to maintain dietary intake, follows a vegan diet and can take tablets consistently, or has been advised by a healthcare professional that oral supplementation is appropriate