Thats a quality control issue, not a glutathione issue
Citrus fruits, berries, kiwi, bell peppers, and leafy greens like kale and spinach are loaded with vitamin C and other antioxidants that protect cells and support collagen synthesis
GHK-Cu addresses tissue repair signaling and collagen remodeling, a layer that none of these other peptides covers in the same way
Reports have revealed that the releasing SO 2 may disrupt the cellular redox equilibrium, and show cytotoxicity to some extent [33]
If you know your levels are low, B12 supplements are a great start, but you're going to be playing catch-up, so dont expect things to be back to normal immediately
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