When you swallow a traditional pill, the harsh acids in your stomach and the enzymes in your digestive tract often break the glutathione molecule down into its individual amino acids before it ever reaches your cells
Phospholipid hydroperoxide GPx4 (PH-GPx) expressed in most tissues, can reduce many hydroperoxides including hydroperoxides integrated in membranes, hydroperoxy lipids in low density lipoprotein or thymine
"Superior potency of infused IGF-I analogues which bind poorly to IGF-binding proteins is maintained when administered by injection." Journal of endocrinology 150.1 (1996): 77-84
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However, other authors emphasize the importance of other regions of the small intestine [49, 51]
While B12 injections are generally safe and well-tolerated, like any medical treatment, they can have some side effects