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Scientists designed them specifically to overcome the limitations of natural IGF-1

They signal your pituitary gland to produce and release your own growth hormone in natural, youthful pulses

Oral vitamin C is limited by intestinal transporters, so plasma levels plateau even when doses increase

Deficiency of alveolar fluid glutathione in patients with sepsis and the adult respiratory distress syndrome

Various pathways have been demonstrated to regulate muscle cell growth 10,11 , among which, the locally derived insulin-like growth factor-1 (IGF-1) is especially important due to its simultaneously promoting and inhibiting protein synthesis and degradation 12,13,14

Dysfunction of mitochondria can lead to impaired insulin sensitivity