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(A) Quantitative analysis of relative fluorescence intensity in Fig

Practical rules: Store in the original dark vial or wrapped in aluminum foil Dark box in the refrigerator No work light during handling (not strictly necessary, but ideal to work in dim lighting) Brief exposure during reconstitution and measurement is fine Long-term storage in light can degrade activity over weeks Practical storage rules Allow the vial to warm to room temperature (15 to 20 min) before opening

The molecular structure of peptides makes them inherently sensitive to environmental conditions, and temperature plays a decisive role in determining shelf life

doi: 10.1016/j.jshs.2020.04.001 59

Additionally, those who exercise regularly would also benefit from L-Glutathione, as exercise causes oxidative stress which generates free radicals

The key is empty stomach