Start SLOW. This is especially true if you are in poor health. Do not immediately assume that “more is better” by using the high end of the range of doses. It’s not. It’s especially not true when first starting out with red and near-infrared light therapy, or if you are in poor health. If you are in poor health, start with the lowest possible doses and SLOWLY increase the dose from there in subsequent sessions. (If you are extremely ill or severely fatigued, you can even start with lower doses than the lowest end of my recommended ranges.) Also, giving a day or two between sessions is a good
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