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Several human clinical studies have determined the bioavailability of NAC

The Sikiric group has consistently characterized BPC-157 as resistant to degradation in human gastric juice, a property attributed to its compact 15-residue length, its five proline residues (which disrupt protease recognition motifs), and the absence of cysteine-bridgedependent tertiary structure (Sikiric et al., 2018)

Plant 10 , 11591173 (2017)

Injectable Vitamin B6 (Pyridoxine) Vitamin B6 has multiple roles in the body, including protein metabolism, energy production and neurotransmitter synthesis

They are often designed to improve the bioavailability of active drugs by increasing their amount in target cells and reducing off-target effects