Most intestinal K cells secrete a biologically active form of GIP consisting of 42 amino acids, GIP (42), which is derived from a 153 amino acid preprohormone precursor distinct from preproglucagon ( Figure 2 ]
Insulin-like Growth Factor 1 Long R3 (IGF-1 LR3) is a synthetic peptide hormone designed to mimic and enhance the effects of naturally occurring IGF-1, a critical growth factor involved in muscle development, recovery, and cellular repair
Many doctors suggest taking it with vitamin C to improve absorption
In reality, a plateau can reflect hydration shifts, digestion changes, sleep quality, stress, strength training, or normal metabolic adaptation
10.1053/j.gastro.2017.01.003 39 GordanJ