It is likely that blood serum and tissue concentration levels of carnitine and propionate increase over time to some point of saturation
If they haven't, continuing use wastes product and potentially harms your skin
Furthermore, it is involved in vital cellular functions like immune system modulation, DNA synthesis and repair, and appropriate enzyme functionall of which are necessary for preserving general health
Calibration standards were prepared by spiking 50 L of human plasma with appropriate amount of thiols to obtain the following concentrations: 20, 40, 60, 100, 200, 300, 600 nmol/mL plasma for Cys, 2, 4, 6, 10, 20, 30, 60 nmol/mL for Hcy, GSH and 0.1, 0.5, 1.0, 2.0, 4.0, 5.0, 10.0 nmol/mL for N-Hcy-Lys