Glutathione, also known as GSH, is your bodys primary defense against oxidative stress and free radical damage
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Some studies show that taking the precursors to glutathione (L-cysteine or N-acetylcysteine), L-methionine or DHEA (dehydroepiandrosterone) actually raises the bodys glutathione levels more than taking glutathione itself
Consult with a healthcare provider if pregnant or planning to become pregnant
For example, you can get 100mcg vitamin B12 tablets for 5p each at a supermarket (2.80 for 60, Sainsbury's) compared to a branded version from Solgar which, at 85p a tablet, makes them 17 times more expensive
A meta-analysis by Dodd et al