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While it is not a first-line treatment, it may be used in functional medicine as part of a broader plan that includes diet, lifestyle changes, and stress management, especially when heavy metal exposure is a contributing factor
doi: 10.3389/fcimb.2021.657775 278 TorzewskiJ.HeiglF.ZimmermannO.WagnerF.SchumannC.HettichR.et al
And if you live outside of the USA, you can order this L-glutamine powder here
10.1007/s12565-020-00573-9 29 FrickeH