I read the Nature paper reference above.
There was increased cellular death in cultured skin cells at higher concentrations of methylene blue, however collagen production did go up with increasing dose.
Why are you guys interested in this?
If it's for thicker, younger appearing skin, I still think your at a concentration that's far too low, especially when you consider how poorly MB seems to diffuse into the skin even when detergents and other compounds to facilitate skin diffusion are added.
The other issue is that they judged their MB concentration and effectiveness in a static tissue culture where the MB was in intimate and constant contact with the cultured cells. In real life you've got diffusion happening really quickly into a nearly limitless sink, the rest of the body, and facilitated by active transport that maintains a high local concentration gradient, the capillaries.
So what if some cells die at higher concentrations of MB?
Do you think that needling doesn't kill off cells in bulk?
It's the trauma of needling that seems to facilitate skin repair and collagen production. Now add some methylene blue....
Again, we'll see how this experiment pans out. This is only the first stage, the current goal being to look for toxic effects.
In the end, I think the Nature paper is a good paper, but not intended for modeling in vivo skin in a dynamic environment.
Edited by The Capybara, 14 February 2018 - 12:53 AM.