Understanding Insulin-like Growth Factor-1 Insulin-like growth factor-1 (IGF-1), formerly known as somatomedin or somatomedin C, has a single chain 70-amino acid polypeptide cross-linked by 3 disulfide bridges. Although IGF-1 provides several benefits similar to insulin such as lower blood sugar levels, the key difference is that insulin mediates mainly a metabolic response, whereas IGF-1 mediates growth-promoting effects (Source)
doi: 10.3390/cancers16040684, 6
The intravenous (IV) form is the most efficient way to deliver glutathione, but is invasive and may also require a prescription and doctor's supervision
To understand its safety, we must first understand what glutathione is
It may have the ability to lighten the skin tone and protect the skin from free radical damage
Studies suggest it can block the NF-B pathway and reduce inflammatory cytokines like TNF- and IL-6 without causing skin darkening, making it a potentially safe option for systemic use