A cosmetic serum sold for topical use, by contrast, is subject to cosmetic regulation covering ingredient safety and manufacturing standards, a genuinely different oversight category, covered in more detail in our article on cosmetics vs medicines regulation
In certain cases, it even requires 12-18 months to provide you with the desired outcome
One review analyzed studies done on animals and human cells, showing that NAC can lower inflammation, oxidative stress, and insulin resistance while improving fat tissue function
This matters for two reasons
It is not a trend ingredient
The overexpression level of the recombinant protein, GshF, seem to be affected by the deletion of these genes of the host strain