@DavidPS said in Protocol for improved facial collagen synthesis:
The general rule is that the longer the wavelength the deeper the light penetrates into the skin. However, when the light wavelength lengthens to the infrared (IR) region, the penetration depth of the light decreases because water in the tissue absorbs IR light.
This is true but doesn’t take account wavelengths affinity for cytochrome C oxidise. Wavelengths around the 660nm value (red light) have the greatest affinity for cytochrome C oxidase acoding to Peat. I think their affinity for cytochrome C oxidase makes up for their lack of pentetration.
All wavelengths of light even FAR infrared light probably are absorbed by cytochrome C oxidase despite some far wavelengths being heavily absorbed by water.
For example, a study showed that a single laser of far infrared radiation applied to the base of the foot (which is largely dead skins ?) for a short period of time was able to substantially decrease blood sugar and cortisol. That can’t happen if it isn’t absorbed by cytochrome c oxidase.