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They are the same thing

The researcher is not choosing a format based on conveniencethey are selecting the route that maximizes the probability of the compound reaching its intended site of action at a sufficient concentration

Convenience Advantage: The Ordinary Since none of our copper peptide serum picks are particularly inconvenient or difficult for most people to use, we based our choice for convenience on the ordering process and company policies

GSH does not readily enter cells

Cell entry mechanisms of SARS-CoV-2

(2016) The proteasome inhibitor lactacystin enhances GSH synthesis capacity by increased expression of antioxidant components in an Nrf2-independent, but p38 MAPK-dependent manner in rat colorectal carcinoma cells, Free Radic