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Users typically notice improved exercise endurance within the first few weeks, with body composition changes becoming apparent after consistent use over 8-12 weeks

Gennarelli et al., 1981, 1982

Glutathione happens to play a role in all three elements

Alternative Routes of Administration & the First-Pass Effect There are several reasons for different routes of administration used in clinical medicine ( Table 33 )for convenience (eg, oral), to maximize concentration at the site of action and minimize it elsewhere (eg, topical), to prolong the duration of drug absorption (eg, transdermal), or to avoid the first-pass effect (sublingual or rectal)