From stress to vitamin deficiency, there are many possible causes of hair loss. However, male pattern baldness (MPB), or androgenetic alopecia, is the most common culprit, causing 90% of male hair loss cases. This is caused by the hormone, DHT, which weakens and shrinks the hair follicles – and ultimately makes them unable to produce hair. That’s MPB and it happens to most men in our lifetimes.