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As a general approach, I suggest starting slow to assess your body’s response at first (with low doses done infrequently for the first few sessions) and then building up to 3-7 sessions per week. As with the biphasic dose response (and with many other types of hormesis, like physical exercise, for example), note that it may turn out that too high of a frequency is detrimental. Although there is no consensus in the research yet, my hunch is that optimal treatment times are probably once every other day to once per day at the most. I personally do it every other day, because that’s what I believe will turn out to be most optimal. How Deep Does Red/NIR Light Penetrate Into Our Body? The answer to this question is actually much more complex than you might imagine... The penetration depth differs depending on many factors: • The type of tissues (e.g. skin vs. bone vs. fat vs. muscle). First, it depends on exactly what part of your body you shine it on. It will penetrate much more deeply into your belly than your skull. • The power output of the device. More powerful lights can deliver more light to deeper tissues of the body. • The distance of the device from your body. As explained previously, the closer the light is to your body, the higher the light intensity will be and the deeper it will penetrate. • The wavelengths of light. Blue light and UV light, for example, get almost completely blocked by the skin and do not penetrate much more deeply than the very surface layers of skin. Whereas red and near-infrared penetrate much more deeply. And within that category, near-infrared has significantly greater penetration depth than red light, and there are even some small differences between specific wavelengths of red and near-infrared light in terms of penetration depth. Penetration depth is also made even more confusing due to varying claims of red/NIR light penetrating only millimeters into the body and other claims of it penetrating inches into the body. How can we make sense of this? Well, first of all, it is actually very easy for even a child to verify that red light penetrates much further into the human body than just a few millimeters. Take a flashlight and go into a dark room. Then shine the light through your fingers. You can see the light – specifically the red wavelengths of light –penetrates all the way through your fingers. If you have a strong enough light, some light can even penetrate all the way through the palm of your hand! So this 5-second test that you can do yourself at home can tell you that it penetrates at least an inch or more. So why the varying claims of millimeters vs. inches? It turns out that “penetration depth” is actually a technical scientific term within the study of light, and it has a specific definition. Most people misunderstand the meaning of this term “penetration depth.”PDF Image | Red Light Therapy Ultimate Guide
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