Krachai dam does not increase the number of cells of the penis. Why should it? There is no need for it.
A bodybuilder who achieves a biceps like Arnold also doesn't increase the number of muscle cells. He only changes their condition.
The biceps, like any other muscle, and like the penis (which isn't a muscle but a sponge) are not of a fixed size, but consist of a genetically determined number of cells. Size depends on cell condition, not cell number.
And on the chemical environment.
You can increase the size of a biceps by injecting anabolic steroids. The muscle will grow, even with no strength training.
It's the same with krachai dam (kaempferia parviflora) and penis size. Krachai dam, taken over a course of weeks or months, changes penile tissue tone in a manner that results in enlargement.
But unlike anabolic steroids, krachai dam (kaempferia parviflora) has no negative impact on overall health. Just like garlic, or olive oil, or shitake mushrooms, krachai dam can be consumed over months, years, or decades. The only possible side effect is the sexuality of a young man, which the wives of old men may consider a bit out of place.