Because oral L-carnitine is only about 15% absorbed, the unabsorbed remainder passes into the lower gut, which is part of why higher oral doses drive more GI complaints
Smallwood MJ, Nissim A, Knight AR, et al
Furthermore, as demonstrated by the findings of the TUNEL analysis, GHK administration resulted in a notable decrease in apoptotic cells, suggesting that neuronal death was inhibited, accelerating neurological recovery [173]
It is neuroprotective and supports normal blood flow to the brain
Glutathione can be taken before radiation therapy: Taking 1000mg of Glutathione daily helps protect kidney cells and nerve cells from the toxic effects of chemotherapy (Oxaliplatin, Cisplatin, Cyclophosphamide, 5.FU, etc.)