You left out a pretty relevant part of that article:
"However, transmitter concentrations were reduced significantly 1 week later, indicating a second phase of depletion. The latter phase of depletion was associated with a decrease in synaptosomal [3H]serotonin uptake due to a loss in the number of uptake sites with no change in the affinity of the carrier for serotonin."
Sure you might be at baseline 24 hours after the initial roll, but you will have significantly fewer so you will not be able to get the same high right away.
And you are conveniently leaving out that the doses to cause such depletion were 10/20 or 40 mg per kg injected into the brain. (equivalent to injecting 10,20, 40 pills worth of MDMA into your brain)
Serotonin synthesis never stops in the human brain -- even if you reduced synthesis by 90% -- the brain will synthesize serotonin to normal tissue levels in a few hours. In most areas of the brain, synthesis rates will provide normal levels of serotonin in minutes.
"
Using the postmortem concentrations of serotonin reported by Young et al. (34) for the putamen (466 ng/g) and temporal cortex (11 ng/g), and the present data for the rates of serotonin synthesis, the time required to synthesize an amount of serotonin equal to the tissue content is 31 and 48 min for the putamen of males and females, respectively, and 0.8 and 1.3 min, respectively for the temporal cortex. "
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC24674/
Sorry, but the "you run out of serotonin" is total bullshit
Based on [admittedly] anecdotal evidence of mega dosing of vitamin C preventing any sort of tolerance and allowing for multiple MAGICAL rolls on even consecutive days, I propose that oxidative damage and some other [currently unknown] mechanism that is prevented or ameliorated by the ascorbate
causes increased beta-arrestin action on the 5HT2 receptors.
beta-arrestins are the FUNCTIONAL cause of desensitization of receptors, and also promote endocytosis (internalization and destruction of the receptor)
dynamin (a GTPase) is also responsible for remodeling of 5HT2 receptors and promoting endocytosis -- of interest, dynamin binding protein is upregulated in response to oxidative stress
The fact that most humans are suffering from sub-clinical scurvy.....