does taking glutathione orally cause any harm The Importance of in Health and Healing What To Avoid When Taking
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The reason medical teams may caution you against certain ingredients (and why we're being careful) is that why don't know if there could be harm involved

Lee, J.S

If side effects are stronger than expected (which can happen if your sublingual bioavailability is on the higher end), decrease by 0.5 to 1 mg daily

doi: 10.1016/j.reprotox.2008.11.057