QC readers skew younger, more price-sensitive and more research-literate than the rest of the metro, and the mail reflects it. Makati asks whether it can arrive today. Katipunan asks what the HPLC purity was on the batch, whether NMN oral precursors are worth bothering with, and how the CD38 problem interacts with dosing.
For the record on that middle question, since it comes up here more than anywhere: oral NMN and NR are precursors that have to be converted, and bioavailability is genuinely contested, with some research suggesting oral NMN gets degraded before reaching cells. The honest position is that we do not know how much oral precursors raise intracellular NAD+. Injectable material raises blood levels directly. That is the whole reason the injectable route exists.
The district also has more mixed housing than anywhere else in this set. Eastwood is condo towers with desks. Katipunan is a mix of low-rise, dorms and family homes. Diliman and the older subdivisions are houses behind gates with no desk at all. One district, three completely different handoffs, which is why a generic delivery instruction is useless here.