L-Theanine Offsets Age-Impaired Immunity and Boosts Flu Fighting Ability

Older mice supplemented with L-theanine¹ and L-cystine for 10 days and then exposed to flu had significantly lower lung flu infections than controls.  The combination directly boosted the level of cellular glutathione (GSH) in immune cells, enabling them to function as if the animals were much younger.

In a separate test the combination also boosted the antibody production in response to immunization.  While I am not an immunization fan, it is clear that those who would like one, especially if elderly, could get a better response to the vaccine by using these nutrients for 2 weeks prior to the vaccine.

The typical supplement form of L-cystine that is used to support GSH production is NAC (N-acetyl-cystine).  This is the first study to show the synergistic immune advantage of combining a popular antioxidant with L-theanine for an improved immune response.  The researchers believe that taking these nutrients “enhances immune function and GSH synthesis compromised with advanced age, and may become a useful strategy in healthy aging.”