Which specific ingredient in Dermacrine acts as a time-releasing agent? As far as I know, it has the active ingredients, along with emulsifiers and absorption/skin penetrant enhancers. The skin itself acts as the time-releasing agent and the body will slowly over a period of a few hours absorb the product and then the body will release/convert it as necessary throughout the day; This rate should be person-dependent.
Highest serum concentrations should be seen a few hours after administration, so if one is looking for a 'boost', a twice daily application may be beneficial. While I agree with you that once-daily application is perfectly fine, there is nothing wrong with twice daily application either. For me, I figure a decent amount of the crystals will get wiped off by clothing as well so that's another reason I prefer split dosing.