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Common causes include deficiencies of key nutrients such as folate, vitamin B, and vitamin B, which are required to recycle homocysteine back into methionine

Nat Protoc 14(2):313330 Yuneva M (2008) Finding an Achilles heel of cancer: the role of glucose and glutamine metabolism in the survival of transformed cells

Others have something specific in mind, like immune support before a flight, recovery after a tough event, or hangover help

The long-term effects of taking glutathione supplements are unknown, and there is concern that high doses of glutathione may cause adverse effects such as liver damage, kidney damage, and even skin cancer