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On the Barron website they describe in great detail how the attempts to use fat or stem cells to get bigger penises has evolved over the years to get to todays technology (emphasis mine): Fat is removed and placed in the penis the same as before, but it is processed in a way that separates stem cells from the rest of the fat, which are then injected into the fat in a very high concentration

Idk seems strange

Research has shown that it stimulates hair follicles, supports scalp health at the cellular level, and plays a meaningful role in the hair growth cycle

It works through different mechanisms and may not produce equivalent results, but for some users it provides meaningful support at dramatically lower cost