The overlap is real, and its messy
The specific criteria for inclusion and exclusion of relevant studies in terms of PI(E)COS (Population, Intervention/Exposure, Comparison, Outcomes, and Study design) are provided in Table 1
For this comparison, we consider examples from their more accessible lines, which typically offer injectable glutathione kits with moderate doses (e.g., 500mg to 1200mg per vial)
This mechanistic debate has been addressed in subsequent literature as reflecting differences in cell culture conditions, peptide batches, and choice of IGF-1 axis inhibitors and does not invalidate the substantial positive evidence base but represents an important research context requiring careful experimental design
Fernandes, L
Skaff noted that nutrition, physical activity and long-term habits remain critical factors in maintaining health outcomes