These are the five types of bioactive light in humans: Blue light—sets the circadian rhythm in our brain, which in turn regulates numerous different neurotransmitters and hormones UV light—allows us to synthesize vitamin D from the sun Far-infrared—acts to heat up our cells (this is the part of the sun’s spectrum that you feel as heat) which stimulates changes in cell function, as well as circulation changes Red light—acts on the mitochondria in our cells to stimulate increased cellular energy (ATP) production (among other mechanisms discussed in this book) Near-infrared (NIR)—acts on the same
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