This site states this specific framing directly: because it works nutritionally, the value tends to build the longer and more consistently you take it.
This site connects this framing directly to its own multi-bottle pricing: this is why most people choose the multi-bottle kits, per this site's own stated reasoning — worth reading the two together.
If value genuinely builds with consistent use, worth weighing whether the smallest 2-bottle package gives enough time to reach that building value, particularly given the site's own memory-timeline of a couple of months.