A one-day class teaching people how to be a coach is embarrassingly poor preparation
Yet, in a recent trial in patients with chronic obstructive pulmonary disease (COPD), oral administration of sulforaphane for four weeks failed to induce the expression of Nrf2, NQO-1, and HO-1 in alveolar macrophages, bronchial epithelial cells, or peripheral blood mononuclear cells (17)
doi: 10.1016/s0015-0282(16)61020-8
Therefore, the primary purpose of this study was to determine the effects of an 8-week RT program in conjunction with daily, orally-delivered GSH + L-citrulline, L-citrulline-malate, or placebo supplementation on body composition and muscle performance
The benefits of glutathione certainly outweigh any downsides
Btw, it is not a FDA-approved sunscreen agent, so you will not find it in sunscreens coming from the US