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J Orthop Res 23(2):281286 Gosens T, Den Oudsten BL, Fievez E, vantSpijker P, Fievez A (2012) Pain and activity levels before and after platelet-rich plasma injection treatment of patellar tendinopathy: a prospective cohort study and the influence of previous treatments

In terms of how nebulized glutathione compares to other forms of administration, injected glutathione may be more effective at increasing glutathione levels in the body, but it can also cause side effects such as pain at the injection site and allergic reactions

(PubMed) Izzo AA, Ernst E

If you are still tired even with normal test results, low NAD+ levels might be the cause