IGF-1 vs IGF-1 LR3: Native Signal vs Extended Anabolic Window Insulin-like Growth Factor 1 (IGF-1) and its long-acting analog IGF-1 LR3 share the same receptor but differ radically in duration of action, and that difference drives almost every clinical decision between them
Some protocols suggest increasing by 1.25 mg when side effects are a concern, and at 5 mg/mL, that 1.25 mg increase is a clean 25-unit adjustment
The break is important: it prevents receptor accommodation and allows the body to consolidate the tissue remodeling that the protocol initiated
As a result, the new mitochondria formed after fusion have mtDNA pools, differences in membrane potential, and a diversity of proteins compared to the mitochondria before fusion (Zhou et al., 2021)
The liver serves as a storage site for this vitamin
Some genetic changes, like in the MTHFR gene, can affect how Vitamin B12 is used in the body