If Your Goal Is Digestive or Gut-Related Support Oral BPC-157 is often the form discussed in the context of gastrointestinal health
Sarcopenia & Muscle Physiology: Research explores its potential to rejuvenate aged muscle stem cells (satellite cells) and improve contractile function in tissue models
References inline as available
Glutathione may be used for treatment of diverse conditions including autism, inborn errors of metabolism, male infertility, cystic fibrosis to improve airway clearance, atherosclerosis, diabetes, immune-stimulation, liver diseases, memory loss, Parkinsons disease, Alzheimer's disease, melasma, hyperpigmentation, etc
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The barrier to permeation is charge and effective hydrodynamic radius rather than raw mass, which is what the cited Hostynek and Li data actually show