The meme with a Japanese flag and researcher on it says: 20 years of blood tests went into proving it; the chemicals trees release into the air enter your bloodstream, calm your stress hormones and fortify your immune system, says Japanese immunologist. “Coniferous forests produce higher levels of phytoncides, which play a crucial role in the benefits of forest bathing,” he explains. https://alotusinthemud.com/science-of-forest-bathing-dr-qing-li/