Reply To: Blood irradiation, how crucial is sunlight to our health?

A variety of methods exist for getting light inside the body. In the classic approach, blood is removed from the body, typically diluted, then infused back into the body, and allowed to pass through light on its way back in (which in turn requires part of the IV to be made of a material such as quartz glass which UV light can pass through).

As UVBI has become more popular, German and Russian researchers (in the early 1980s) developed two alternative approaches—directly applying a laser onto a blood vessel at the surface of the body (e.g., the back of the knee at the popliteal vein or under the tongue at the lingual veins) or threading a fiber optic cable into a vessel (e.g., through an IV) and illuminating the vessel from inside. Each of these approaches (collectively known as laser blood irradiation or LBI) have been found to be relatively equivalent to each other, with the main difference being that LBI requires more treatments.
Note: to the best of my knowledge, all the LBI studies cited in this article utilized an internal form of LBI.