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Again, note that the biggest phase shifts occur when light is administered near the CBTmin

Oxidative stress tests evaluated the antioxidant effects by measuring ROS levels in H 2 O 2 -exposed SH-SY5Y cells
Diagn Microbiol Infect Dis 79: 7784, 2014 [DOI] [PubMed] [Google Scholar] 7.Imani S, Buscher H, Marriott D, Gentili S, Sandaradura I: Too much of a good thing: A retrospective study of -lactam concentration-toxicity relationships

Barbiturates or caffeine consumption may temporarily lower these levels
That distinction helps explain why people often describe BPC-157 as more targeted in online discussion and TB-500 as more systemic. Those are community shorthand descriptions, not formal clinical categories, but they reflect how the literature is commonly interpreted