The skin benefit is promising according to your article and I will be documenting the results.
Is the depth mechanically locked
Increased availability of serotonin precursors augments the amount of available serotonin, which might lead to the development of the serotonin syndrome [182] and, thereby, the involvement of both 5-HT1A and 5-HT2A receptors
Enhanced NO Stability - Once NO is produced, glutathione acts as a powerful protector against oxidative damage
Still, in the process, it can create Superoxide, oxygen with too many electrons that is poisonous to everything around it, be it mitochondria, DNA, proteins, cell membranes, etc
Regarding conversion, we can cite only a manufacturers claim saying that EAC is metabolized in the skin into pure ascorbic acid (and the ascorbic acid content of EAC is very high - 86,4% - compared to the usual 50-60% Vitamin C content of other derivatives)